Colletes murinus Friese, 1900

Ferrari, Rafael R., 2017, Taxonomic revision of the species of Colletes Latreille, 1802 (Hymenoptera: Colletidae: Colletinae) found in Chile, Zootaxa 4364 (1), pp. 1-137 : 83-86

Colletes murinus Friese, 1900

( Figs. 42A–F )

Colletes murinus Friese, 1900: 184 ; Toro 1986: 122; Moure & Urban 2002: 14; Moure et al. 2007: 684; Montalva & Ruz 2010: 22; Ascher & Pickering 2017.

Lectotype ♀ (examined) designated by Moure & Urban (2002: 14). {ZMB}.

Diagnosis. The combination of clypeal mid-longitudinal area depressed and lacking carina, mesosomal pubescence with off-white and black hairs intermixed, and T2–T5 black and covered with pale-yellow appressed hairs is sufficient to differentiate C. murinus from all other Chilean species of the genus, except C. ventricarinatus n. sp. The female of these species, however, can be distinguished by clypeus with a pair of pits subapically in C. murinus (clypeus with a transverse depression subapically in C. ventricarinatus n. sp.); and S6 not carinate laterally in C. murinus (S6 carinate laterally in C. ventricarinatus n. sp.). The males can be differentiated by F2 1.4x as long as F 1 in C. murinus (F2 1.2x as long as F 1 in C. ventricarinatus n. sp.); and mesepisternal interspaces smooth in C. murinus (mesepisternal interspaces rugulose in C. ventricarinatus n. sp.).

Redescription. FEMALE ( Figs. 42A, 42C, 42E ): Dimensions (mm): Approximate body length 8.5–9.6; head width 3.3–3.7; head length 2.5–2.8; intertegular distance 2.7–3.0; forewing length 7.8–8.6.

Colouration: Black except dark-brown on tegula, wing veins (except vein R of forewing), stigma, ventrally reflexed lateral areas of T1–T2, marginal zones of T1–T4. Reddish-brown on distal half of tarsal claws; marked on distal half of mandible. Pale-brown on tibial spurs, distitarsi, proximal half of tarsal claws, marginal zones of S1– S5.

Structure: Labrum medially concave; concavity margined by lateral ridges. Clypeal mid-longitudinal area evenly deeply depressed; depression narrow (0.4x MOD) on upper 1/3, broader (=MOD) on middle 1/3; adjacent lateral area convex; apicomedial ridge absent. Malar area ~1.6x as long as basal depth of mandible (38:28). F1 ~1.4x as long as its apical width (30:21). UID:LID (72:68). Genal area concave behind upper summit of compound eyes in lateral view. Dorsolateral angle of pronotum modified into a spine. Horizontal surface of metapostnotum ~0.3x as long as metanotum (14:40); metapostnotal pits well-delimited; posterior transverse carina straight and complete. Posteromedial surface of front coxa without spine. Posterior hind tibial spur ciliate. Hind basitarsus ~3.6x longer than broad (50:14). Outer rami of hind tarsal claws ~2.3x as long as inner rami (28:12). Posterolateral area of S6 flat and lacking carina; marginal zone depressed.

Pubescence: Mixed off-white and black hairs, plumose, erect, long on paraocular and interantennal areas, genal area (ranging from moderately short behind upper summit of eye to very long near proboscidial fossa), metanotum; moderately long on lateral slopes of clypeus and supraclypeal area, pronotal lobe, mesoscutum, scutellum; with only black hairs on frontal and vertexal areas, mesepisternum, metepisternum, upper margin of lateral surface of propodeum (except very long), ventral surface of coxae and front and mid trochanters (except moderately short), posteroventral surface of front trochanter and femur. Black, erect, moderately long setae on mandible, dorsal surface of mid and hind tibiae and basitarsi; such hairs long on posterior surface of front tibia, posterior margin of front basitarsus, distal half of posterior surface of hind tibia; very long on posterior margin of mid and hind basitarsi. Fulvous, suberect, moderately short, thick setae on ventral surface of mid and hind tarsi; thickest towards distal margin. Black, suberect, very long hairs, which are branched only apically on anterior surface of hind femur and tibia. T1–T5 covered with pale-yellow dense appressed hairs (slightly sparser on T1); T1 also with pale-yellow, plumose, erect, long hairs; short on T2–T3; T4–T5 with black, moderately long setae. S1 with fulvous, plumose, erect, moderately long hairs. S2 with black, erect, short hairs, which are branched only apically. S3–S6 with fulvous, erect, moderately short setae.

Surface sculpture: Clypeal mid-longitudinal depression densely and finely punctate; adjacent convex area with very sparse fine punctures; integument longitudinally striate near apicolateral corner; interspaces smooth throughout. Malar area minutely punctate near eye; longitudinally striate elsewhere. Supraclypeal upper half smooth; lower half imbricate. Paraocular area densely and moderately finely punctate throughout (except slightly sparser and coarser towards antennal socket); interspaces smooth and shiny. Frontal area densely and moderately coarsely punctate; interspaces rugulose but somewhat shiny. Vertexal area with moderately coarse punctures intermingled with fine ones; densely punctate on half near lateral ocellus; sparsely punctate on half near eye. Dorsal mesosoma with smooth and shiny interspaces throughout. Mesoscutum moderately finely and moderately densely punctate (except sparsely punctation mid-posterior area). Scutellum and metanotum densely and moderately coarsely punctate (except slightly finer on latter). Mesepisternum moderately sparsely and moderately finely punctate; interspaces smooth (except rugulose anteriorly episternal groove). Metepisternum rugose above; obliquely striate medially; smooth below. Lateral surface of propodeum finely and moderately densely punctate; interspaces rugulose. Upper area vertical surface of metapostnotum transversely striate medially. Metasomal terga minutely and moderately densely punctate (except T1 sparsely punctate); interspaces smooth and shiny. Metasomal sterna minutely and sparsely punctate (except posterior half of S6 densely and moderately finely punctate); interspaces imbricate.

MALE ( Figs. 42B, 42D, 42F ). As in female, except for usual secondary sexual characteristics and as follows:

Dimensions (mm): Approximate body length 7.4–8.1; head width 3.1–3.2; head length 2.3–2.4; intertegular distance 2.0–2.2; forewing length 6.9–7.3.

Colouration: Middle 1/3 of mandible black. Wing veins pale-browns (except veins R and C of forewing darkbrown). Proximal half of distitarsi dark-brown.

Structure: Labrum medially concave; concavity not margined by lateral ridges. Clypeal mid-longitudinal area evenly shallowly depressed; depression narrow (0.5x MOD) on upper 1/3; broader (0.8x MOD) on middle 1/3. Malar area ~2.3x as long as basal depth of mandible (56:24). F1 about as long as its apical width (28:27). UID:LID (72:60). Dorsolateral angle of pronotum modified into a spine. Horizontal surface of metapostnotum ~0.5x as long as metanotum (24:46). Hind basitarsus ~ 4x longer than broad (49:12). Outer rami of hind tarsal claws ~1.7x as long as inner rami (28:16). Marginal zone of S6 not depressed. S7, S8 and genital capsule as in Figs. 43A, 43B, 43C , respectively.

Pubescence: Off-white on lateral slopes of clypeus, supraclypeal area, legs (except front tibia with a few black hairs). Marginal zones of S1–S5 with a band of off-white, plumose, suberect, short hairs.

Surface sculpture: Clypeal striae restricted to lower 1/5. Supraclypeal area moderately densely punctate. Malar lower 1/4 smooth. Frontal area punctures crowded. Metanotal interspaces imbricate. Upper area vertical surface of metapostnotum rugulose medially. Metasomal terga finely punctate; T1 moderately densely punctate. S6 evenly finely punctate.

Material studied. Primary type specimen: Lectotype ♀ —“ Peru; Callanga; 98 ”. “ Colletes ♀; murinus ; 1900 Friese det.”. “Type”. “Coll.; Friese”. “Zool. Mus.; Berlin”. “LECTOTYPE; Colletes murinus ; Friese, 1900; lab. Melo, 2015”. “http://coll.mfn-berlin.de/u/; 58f9c1 ”. { ZMB}.

Additional specimens: CHILE — Region XV: NE of Putre , (-18.180, -69.524), 4040m, 2/xi/2013, [S.Monckton] , 1♂, { PCYU}. Pucará Belén , (-18.472, -69.527), 3178m, 1/xi/2013, [S.Monckton] , 1♂, { PCYU}. Region I: Mamiña , (-20.062, -69.222), 2757m, 30/i/1972, [ Montenegro] , 1♀, { PCYU}. Region II: Calama , (- 22.466, -68.897), 2317m, ii/1992, [L.Peña] , 1♂, { AMNH}. Chiu-Chiu , (-22.337, -68.615), 2555m, 30/iii/2000, [L.Packer] , 4♂♂, { PCYU}. Road to Matancilla , (-22.665, -68.230), 3079m, 21/xi/2013, [Postlethwaite & Monckton] , 1♀ 1♂, { PCYU}. San Pedro de Atacama, (-22.910, -68.211), 2422m, 7/i/1971, [H.Toro] , 1♂, {PUCV}; idem, except [L.Ruz], 1♂, { AMNH}. Toconao , (-23.193, -67.998), 2519m, 9/xii/1996, [U.Peña] , 1♀, {AMNH}.

Range. Chile (Regions XV, I, II), Peru (Lima). See also Fig. 30B .

Biogeographic distribution. South American transition zone: Desert and Atacama provinces. Northern Chilean and Southern Peruvian species distributed in the summer rainfall area at altitudes of 2300–4100m a.s.l.

DNA barcode. Unavailable.

Floral hosts. Unknown.

Comments. Uncommon species originally described from Peru, and its occurrence in Chile was reported only very recently ( Ascher & Pickering 2017). This probably explains the reason why Toro (1999) did not include this species in his key for the Chilean Colletes , although I have studied one male C. murinus that Toro caught himself in San Pedro de Atacama (Region II) in 1971. The remarkable morphological homogeneity that the male C. murinus shares with males of other species (e.g. C. gilvus , C. ventricarinatus n. sp., C. alocochila ) probably prevented Toro from assessing the actual identity of that male specimen.

Figures

FIGURE 30. Geographic distribution by Colletes species. (A) C. gilvus and C. fulvipes; (B) C. murinus and C. kuhlmanni n. sp.; (C) C. mastochila and C. lucens. Scale bars approximately 300 km.

FIGURE 42.Colletes murinus Friese, 1900.Female:(A) habitus, lateral view; (C) face, frontal view; (E) habitus,dorsal view. Male:(B) habitus, lateral view; (D)face, frontal view; (F) habitus, dorsal view.Scale bars = 2mm.

FIGURE 43.Dorsal view of the male terminalia of C. murinus. (A) S7; (B) S8; (C) genital capsule.Scale bars = 1mm.