Chilicola (Oroediscelis) pustulata Packer and Dumesh, 2019

Packer, Laurence & Dumesh, Sheila, 2019, Fifteen new species of Chilicola (Oroediscelis) (Hymenoptera: Colletidae: Xeromelissinae) with illustrated keys to the males and females of the subgenus, Zootaxa 4559 (1), pp. 1-56 : 19-21

Chilicola (Oroediscelis) pustulata Packer and Dumesh , new species

urn:lsid:zoobank.org:act:C130A045-60B0-42B1-B638-A5E6F96AA6EF

( Figs. 48–53 , 81 , 105 , 108–111 )

Diagnosis. This is the only species of C. ( Oroediscelis ) with a toothed metatrochanter in the male ( Fig. 53 ). The following combination is also diagnostic for males: inner crest and adjacent medial crest of metatibia marked with yellow, metabasitarsus not marked with yellow and profemur unmodified. The only other species with a yellow marked metatibia are C. bigibbosa Michener , in which the profemur is strongly swollen basoventrally, and C. maculipes Michener , which has yellow on the metabasitarsus. The inner crest of the metatibia is enormously developed into an almost rectangular flange and it is the basoventral corner of this which bears the yellow coloration.

Description. Male: Length 6.0– 6.3mm; forewing length 4.5 mm, head width 1.4–1.45 mm.

Head: about 1.1 X as long as wide, 79:70. Clypeus with transverse apical yellow band, paraocular area yellow to just below level of dorsal margin of clypeus; mandible without yellow maculation. Clypeal punctures large, i=1– 3 d; supraclypeal area punctures small, i=1–4 d; lower paraocular area sparsely punctate, i=1–4 d; frontal area alveolate-punctate. Malar space approximately half as long as wide (6:11); lower ocular tangent at around upper 0.4 X length of clypeus. Longest hairs on face between antennae, 2.5–3 MOD; genal beard with hairs up to 3.2 MOD. F1 as long as F2 on anterior surface (11:11) but longer on posterior surface (12:10); F2 with subapical seta subequal in length to F3, F3 with seta <0.5 length of F4.

Mesosoma: pronotum with dense punctures, i<d and transverse wrinkling; mesoscutum and mesoscutellum somewhat shiny, imbrications shallow, punctures distinct, i=1–3 d and i=1–4 d respectively, punctures somewhat larger on mesoscutellum; metanotum distinctly punctate, i=1–3 d; mesepisternum punctate, i=1–2 d, sparser above scrobe. Metepisternum rugoso-striate, strongly above, weakly below; metapostnotum as long as mesoscutellum (16:16), with frequently incomplete unbranched longitudinal striae; lateral surface of propodeum shallowly punctate, punctures hard to detect amongst strong imbrication. Longest hairs of thorax on mesepisternum, ~3 MOD, most hairs of mesoscutum ~1.5 MOD. Stigma much shorter than marginal cell on wing margin (28:45); marginal cell gradually set off from leading edge of forewing; distal stigmal perpendicular slightly apical to first submarginal crossvein. Profemur slender. Mesofemur strongly concave basoventrally. Metatrochanter with apicoventral slightly acute tooth. Metafemur with posteroventral margin rounded, with weak convexity at apical 1/ 5 th. Metatibia more than twice as long as greatest depth (44:21) which is on the inner flange, apical brush absent; inner crest with deep concavity just basad of flange, flange forming a large blister-like, shiny surface that is longer than wide, 21:13; transverse crest short, evenly rounded in outer view; metabasitarsus almost as long as remaining tarsomeres combined (42:47), ventral process bilobed, strongest lobe at midlength bearing thick bristles on inner surface, lobes somewhat produced anteriorly, apex of apical lobe almost right angular in transverse view.

Metasoma: somewhat shiny except submarginal areas very shiny, T1–T3 shallowly punctate, i=1–3 d, sparser elsewhere, apex of apical impressed area impunctate for ~0.5 MOD, punctures increasingly sparse on succeeding apical impressed areas; apicolateral patches of white, plumose hairs on T1–T3. S1 with long, posteriorly oriented, plumose hairs anteriorly, 2 MOD, shorter erect hairs laterally, longest 1.5 MOD; S2 erect plumose hairs lateral and posterior to process, longest posteriorly, 1.5 MOD; S3 with few long hairs posterolaterally, <1.5 MOD; S4 with hairs 1.5–2 MOD, S5 erect hairs sinuate, 3 MOD; S6 apical tuft ~2.5 MOD. S1 unmodified; S2 transversely evenly concave between longitudinally oriented ridge-like processes, length of truncate apex of process, ~1.5 MOD; S3 with weak lateral boss; S4 with process short, or merely a strongly pronounced lateral boss, ~1 MOD; S5 unmodified, without process; S6 without apicolateral fovea, apical impressed area distinct, elongate ~1.1 MOD, subapical setal row long, ~4 MOD, at ~40° to impressed area.

Terminalia : refer to Figs. 47–49 .

Female: unknown.

Material studied. Holotype male and three male paratypes: PERU, Cusco Departamento , Cuzco, 24.xi.1965, H. & M. Townes [ AEI] [See Figs. 184–185 for distribution map].

Etymology. This specific epithet refers to the blister-like inner flange to the metatibia.

Comments. This is the only species in the subgenus with a tooth to the metatrochanter. Similar structures have arisen, apparently independently, on numerous occasions within the Xeromelissinae ( Packer, 2008; unpublished observations).

Figures

FIGURES 48–53. Chilicola Pustulata. 48. male lateral habitus (paratype); 49. male face (paratype); 50. male genital capsule, dorsal view (holotype); 51. male S7, dorsal view (holotype); 52. male S8, dorsal view (holotype), 53. male, toothed metatrochanter

FIGURES 81–82. Face, anterior view, showing: 81. presence (C. Pustulata paratype); 82. absence of yellow clypeal maculation (C. carPenteri holotype).

FIGURES 105–106. Metabasitarsus in anterior view to show: 105. distinctly bilobed ventral process (C. Pustulata paratype); 106. weakly bilobed or singly lobed ventral process (C. transversaria Michener) (the example shown in Fig. 106 approaches the bilobed condition more than any other species for the second half of couplet 14).

FIGURES 107–108. Ventral view of S2 to show: 107. transverse ridge between processes (C. maculiPes); 108. absence of transverse ridge between processes (C. Pustulata paratype).

FIGURES 109–110. Anterior view of: 109. profemur to show absence of ventral lobe (red line—contrast with Fig. 28b in Michener 2002) (C. Pustulata paratype); 110. mesofemur to show absence of ventral tooth at base (contrast with Fig. 28b in Michener 2002) (C. Pustulata holotype).

FIGURE 111. Metasoma ventral view to show length of processes of S4 which would not attain posterior margin of sternum if pressed down. Height of process, red line; distance between process and apex of sternum, blue line (C. Pustulata paratype).

FIGURES 43–47. Chilicola boharti. 43. male lateral habitus (paratype); 44. male face (paratype); 45. male genital capsule, dorsal view (holotype); 46. male S7, dorsal view (holotype); 47. male S8, dorsal view (holotype).

FIGURES 184–185. Distribution maps of newly described Chilicola (Oroediscelis) species. 184. Large scale map of South America showing distribution of new species; 185. Small scale map of northern Argentina to show distribution within the country.