Chilicola (Heteroediscelis) diaguita Toro & Moldenke, 1979

Monckton, Spencer K., 2016, A revision of Chilicola (Heteroediscelis), a subgenus of xeromelissine bees (Hymenoptera, Colletidae) endemic to Chile: taxonomy, phylogeny, and biogeography, with descriptions of eight new species, ZooKeys 591, pp. 1-144 : 48-51

Taxon classification Animalia Hymenoptera Colletidae

Chilicola (Heteroediscelis) diaguita Toro & Moldenke, 1979 Figs 12 D–F; 13A; 14 A–B; 19A; 36 A–J; 49

Chilicola diaguita Toro & Moldenke, 1979: 116-117 (male holotype, female allotype, AMNH [examined]). Packer 2008: 77. Montalva and Ruz 2010: 28 (checklist). Moure et al. 2012 (catalogue). Ascher and Pickering 2015 (checklist).

Diagnosis.

Males are diagnosable by the combination of malar space 1.5-1.6 × as long as the clypeal lateral, apical surface of the S1 process weakly longitudinally concave, and LOT above or just tangent to upper margin of anterior tentorial pits. Females are diagnosable by the combination of protibia with yellow colouration on dorsal surface only in basal half, malar space 1.4 –1.6× as long as the clypeal lateral, and LOT above or just tangent to upper margin of anterior tentorial pits. Shorter-faced individuals of both sexes may be confused with Chilicola vina and are best distinguished by the position of the LOT, which in Chilicola vina passes through the upper margin of the anterior tentorial pits. Additionally, males of Chilicola diaguita have the S8 anteromedial sclerotized margin wide and subparallel to margin throughout, not swollen as in Chilicola vina .

Description.

Male. Length 6.0-6.7mm, forewing length 3.5-4.2mm, head width 1.2-1.4mm, thorax width 1.3-1.5mm, median ocellar diameter (OD) 0.13-0.15mm.

Colouration: Black-brown, following parts yellow: labrum except apical margin; inverted T shape on clypeus and apex dark laterad; lower paraocular area, extending <1OD above transverse portion of epistomal suture medially, further laterally but not reaching lower tangent of antennal socket; apicoventral spot on scape; apicoventral surface of pedicel; protrochanter apical rim posteriorly; apex of profemur broadly on anterior surface, narrowly on posterior surface; dorsal surface of protibia, including dorsal half of anterior surface; narrow apical ring on mesofemur; narrow basal ring and apicodorsal spot on mesotibia; wide basal ring on metatibia, as well as apical quarter in ventral half only; basal one-third of metabasitarsus ventrally; faint anterior spot on tegula. Ventral surface of antennal flagellum yellow-brown, narrowing basally on F1, and F11 brown. Apical one-third of prodistitarsus brown. Metasoma black, T1-T7 marginal zones translucent yellow.

Pubescence: White, hairs generally short (0.5OD) and sparse, not especially plumose; on lower paraocular area and around antennal base long and moderately dense (1.5-2OD); genal beard long and moderately dense (0.5-2OD) longest at midlength; mesoscutal hairs moderately long and sparse, denser toward lateral margin (0.5-1OD); discs of scutellum and metanotum mostly bare, few short hairs (0.5OD), longer and denser toward lateral and posterior margin of scutellum (1-2OD), and toward lateral margin of metanotum (≤2OD); propodeal hairs moderately long and dense dorsolaterally (0.5-2OD); T1-T3 apicolateral patches of tomentum (0.5-1OD); S2 hairs long and dense (1.5OD basolaterad, 1OD distilaterad, shorter mesad).

Surface sculpture: Microsculpture imbricate, integument generally dull; punctures generally small and deep. Clypeus and lower paraocular area moderately densely punctate (i=1-2d) except clypeus sparsely punctate medially (i=2-3d); supraclypeal area irregularly punctate (i=1-3d) densely punctate toward lateral margin (i≤d); frontal and vertexal areas very densely punctate (i≤0.5d); ocellocular space densely punctate adjacent to compound eye (i≤d) becoming impunctate adjacent to lateral ocellus; vertexal area rugose; scape shallowly and moderately densely punctate (i=1-2d) densely punctate apicoventrally (i≤d); genal area microstriate and moderately densely punctate (i=1-2d); hypostomal area glossy apically and sparsely punctate (i=1-3d); pronotum densely punctate (i=0.5-1d), lateral surface coarsely imbricate; mesoscutum, scutellum, and metanotum densely punctate (i≤d) except mesoscutal punctures crowded around median (i≤0.5d); mesepisternum irregularly punctate, moderately dense to sparse below scrobe (i=1-2d), sparser anterior of episternal groove (i=2-3d), dense on hypoepimeral area (i≤d); metepisternum densely punctate (i≤d); metapostnotum rugose, more weakly microsculptured posteriorly; propodeum coarsely imbricate, rugulose posteriorly, moderately densely punctate throughout (i=1-2d); T1-T6 coarsely imbricate; T1 sparsely punctate basally (i≥2d) dense apically (i≤d); T2-T5 very densely punctate (i≤d) basal depressed area more coarsely microsculptured but punctures distinct; T6-T7 moderately sparsely punctate (i=1-3d); marginal zones of terga weakly imbricate and shiny, minutely punctate.

Structure: Labrum ~2.6 × wider than long (28:11); malar space 1.5-1.6 × as long as clypeal lateral (15-16:10); LOT above anterior tentorial pits; clypeus ~1.25 × as long as maximum width in frontal view (43:35) extending for more than half of its length beyond LOT; median longitudinal groove present on clypeus but weak apically; subantennal sutures ~1.5 × as long as the shortest distance between them (23:15); IAD ~1.6 × AOD (14:9); scape ~2.4 × as long as maximum width (29:12); pedicel shorter than wide (10:11); F1 shorter than wide (10:11); F2 1.4 × as long as F1 and shorter than F3 (F2:F3 - 14:15.5); UOD ~1.4 × LOD, IOD ~1.1 × UOD (UOD:IOD:LOD - 57:63:40); frontal line carinate between antennal bases for a length of ~0.5OD, flat just below median ocellus for a length of ~1OD, otherwise undefined; MOC ~1.1 × as long as width of head (111:101); OOC ~0.6 × IOC (13:21); genal area ~0.6 × as wide as compound eye in lateral view (20:35); ratio of lengths of mesoscutum: scutellum: metanotum: metapostnotum - 75:26:14.5:19; probasitarsus ~3.9 × as long as maximum depth (31:8); length of prodistitarsus ~0.8 × that of preceding three tarsomeres combined (from II to V - 8:6:5:16); metafemur ~1.85 × as long as maximum depth (84:45); summit of metatibial ventral convexity near tibial apex; metatibia ~1.75 × as long as maximum depth (61:35); in apical view apical lamina of metatibia broad and thick, length ~0.9 × OD (10:11); ventral metatibial carina toothed near apex, posterior carina sublinear and weakly defined basally; metabasitarsus 4.25 × as long as maximum depth (51:12); S1 process apical surface longitudinally concave at least posteriorly, in lateral view anterior and posterior margins divergent apically, apex appearing anteriorly bent. S7 apodemal arm sclerotized margin terminating laterally at arm midlength; ventral lobe narrow, almost linear; dorsal lobe strap-like, subparallel-sided and somewhat anteriorly curved, with basal tuft of long setae and a short apical row, midlength bare; apex of disc sinuate. S8 lateral process ~1.2 × wider than long, anteromedial sclerotized margin following marginal contour. Gonobase apicoventral truncate process biconvex and distinctly notched by a width less than one convexity.

Female. Length 5.3-6.6mm, forewing length 3.3-3.5mm, head width 1.1-1.2mm, thorax width 1.2-1.4mm, median ocellar diameter (OD) 0.12mm.

Colouration: Black to black-brown except as follows: mandible with yellow basal spot, translucent yellow in apical half except apex translucent brown. Following parts brown: pedicel, F1 and F2, on apicoventral margins. Following parts variably yellow to yellow-brown: ventral surface of F3-F10, each suffused with brown basally; dorsal surface of protibia in basal half; apical half of prodistitarsus; basidorsal spot on mesotibia; faint anterior spot on tegula. Metasoma black, T1-T5 marginal zones translucent yellow.

Pubescence: As in male except as follows: clypeal hairs short and sparse (0.5OD); on lower paraocular area and around antennal base moderately long and moderately dense (1OD); genal beard sparse (0.5-2OD); discs of mesoscutum, scutellum, and metanotum with sparse short hairs (≤0.5OD), longer and denser toward lateral margin as follows: mesoscutum (0.5OD), scutellum (1-1.5OD) also on posterior margin, longest posteromedially, metanotum (≤2OD); propodeal hairs moderately long and dense dorsolaterally (0.5-1.5OD); scopae on metafemur and metatibia (1-1.5OD); T1-T2 apicolateral patches of tomentum (0.5-1OD), T3 apicolateral hair band sparse, not tomentose; S1 hairs long and moderately dense (≤2.5OD); S2 scopal hairs (1-3OD).

Surface sculpture: As in male except as follows: frontal and vertexal areas densely punctate (i≤d); scape shallowly and moderately densely punctate (i=1-2d); genal area weakly microstriate and moderately densely punctate (i=1-2d); hypostomal area weakly imbricate to glossy apically, shallowly and moderately densely punctate (i=1-2d); mesoscutum densely punctate (i=0.5-1d) crowded around median (i≤d); scutellum densely punctate (i≤d); mesepisternum irregularly punctate, sparse below scrobe (i=1-3d), sparser anterior of episternal groove (i=2-3d), denser on hypoepimeral area (i≤2d); metanotum densely punctate (i≤d); metapostnotum rugose, more weakly microsculptured posteriorly; propodeum moderately densely punctate (i=1-2d); T1 punctures small and sparse (i≥2d basally; i=1-3d apically); T2-T5 punctures small and sparse (i=1-3d on T2-T3; i≥2d on T4-T5); T6 moderately densely punctate (i=1-2d).

Structure: Labrum 2.6 × wider than long (26:10); malar space ~1.4-1.6 × as long as clypeal lateral (12-13.5:8.5); LOT crossing above anterior tentorial pits; clypeus ~1.3 × as long as maximum width in frontal view (40:31) extending for more than half of its length beyond LOT; clypeus median longitudinal groove weakly present at least in dorsal half; subantennal sutures ~1.2 × as long as the shortest distance between them (17:14); IAD ~1.4 × AOD (12:8.5); scape ~3.1 × as long as maximum width (25:8); pedicel longer than wide (9:8); F1 longer than wide (8:7); F2 shorter than F1 and shorter than F3 (F2:F3 - 5:6); UOD ~1.33 × LOD, IOD 1.1 × as long as UOD (UOD:IOD:LOD - 50:55:37); frontal line carinate in lower third, flat above; MOC ~1.2 × as long as width of head (99:84); OOC ~0.6 × IOC (11:19); genal area ~0.65 × as wide as eye in lateral view (18:28); ratio of lengths of mesoscutum: scutellum: metanotum: metapostnotum - 62:23:11:15; probasitarsus ~3.7 × as long as maximum depth (26:7); length of prodistitarsus ~0.9 × that of preceding three tarsomeres combined (from II to V - 6.5:6:4.5:15); metafemur 3 × as long as maximum depth (54:18); metatibia ~4.25 × as long as maximum depth (64:15); metabasitarsus ~4.3 × as long as maximum depth (41:9.5).

Material studied

(8 males & 22 females): Holotype (male): Region IV, La Serena, S 29.906°, W 71.250°, 20m, 28.ii.1956, Moure (AMNH); Allotype (female): same locality as holotype, 20.iii.1952, Wagenknecht (AMNH); Region IV: one male, Choros Bajos, S 29.291°, W 71.309°, 57m, x.1977, De La Hoz (PUCV); one male, same locality, 12.x.1977, H. Flores (AMNH); one female, same locality and date, Magunacelaya (PUCV); four females, Q. Los Choros, S 29.343°, W 71.155°, 232m, 12.x.1977, V. Cabezas (PUCV); three females, Cuesta Buenos Aires, S 29.5624°, W 71.2530°, 518m, 8.xi.2013, S. Monckton (PCYU); two females, same data (CTMI); one male, same data, CCDB-19989 B09 // PCYU 0021683 (PCYU); one male and one female, same locality, Cuesta Buenos Aires, 13.x-8.xi.2013, S. Monckton, pan traps, CCDB-22789 D07, CCDB-22789 D10 (PCYU); two females, 1.1 km S on Rd to Tololo Observatory, S 30.0358°, W 70.8158°, 543m, 22.x.2009, J.Gibbs (PCYU); two males and four females, Vicuña, Agric. Exp. Station, S 30.036°, W 70.6913°, 650m, 5.xi.2003, F.D. Parker & M.E. Irwin, pan traps, CH-56 FDP 110911, CH-56 FDP 111827, CH-56 FDP 110929, CH-56 FDP 111935, CH-56 FDP 111836, CH-56 FDP 111822 (BBSL); one male, Quebrada, El Arrayan, 33 km S La Villa, S 30.1952°, W 70.9338°, 653m, 1-8.xi.2003, F.D. Parker & M.E Irwin, malaise trap, CH-56 FDP 109942 (BBSL); one female, Quebrada, El Arrayan, 15 km S La Villa, S 30.071°, W 71.0007°, 400m, 20.xi.2003, F.D. Parker & M.E. Irwin, malaise trap, CH-56 FDP 109833 (BBSL); one female, Quebrada, El Arrayan, 15 km S La Villa, S 30.1045°, W 70.9902°, 472m, 1.xi.2003, F.D. Parker & M.E. Irwin, pan trap, CH-11 FDP 111580 (BBSL); one female, Elqui Prov., Pangue, S 30.1539°, W 70.6639°, 1686m, 11-30.ix.2004, A. Ugarte (PCYU); one female, 1.1 km S on road to Tololo Obs., S 30.3058°, W 70.8151°, 1069m, 11-22.x.2009, J. Gibbs, CHL-09:134 (PCYU).

Distribution.

Coquimban–Intermediate Desert transition zone, from Choros Bajos southeast to Tololo Observatory (Region IV); 20-1686m a.s.l.

Ecology.

Recorded September to November and February to March.