Colletes guanta Rojas & Toro, 1993

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 : 67-70

Colletes guanta Rojas & Toro, 1993

( Figs. 33A–C )

Colletes guanta Rojas & Toro, 1993: 84 ; Toro 1999: 29; Moure et al. 2007: 682; Montalva & Ruz 2010: 22; Ascher & Pickering 2017.

Holotype ♀ (examined). {AMNH}.

Diagnosis. The following combination of characters is sufficient to separate C. guanta from all other Colletes species found in Chile: clypeal mid-longitudinal area carinate, mesoscutal pubescence pale-yellow, hind tibia darkbrown, and metasomal terga metallic blue.

Colletes guanta is most similar to C. quelu , however, the females (males of both species remain unknown) of these species can be distinguished by the comparatively longer malar area, 1.8x as long as basal depth of mandible, in C. guanta (malar area 1.5x as long as basal depth of mandible in C. quelu ); comparatively shorter F1, ~1.2x as long as its apical width, in C. guanta (F1 ~1.4x as long as its apical width in C. quelu ); and hind tibia dark-brown in C. guanta (hind tibia pale-orange in C. quelu ).

Redescription. FEMALE ( Figs. 33A, 33C, 33E ): Dimensions (mm): Approximate body length 7.4–7.6; head width 3.0–3.1; head length 2.3; intertegular distance 2.1–2.2; forewing length 6.0–6.1.

Colouration: Black except metallic blue on metasomal terga (discs also with greenish hues); marginal zones metallic purplish. Dark-brown on tegula, vein R of forewing, legs (except pale-brown on tarsomeres 2–5), metasomal sterna (discs of S2–S5 with metallic dark-blue hues). Pale-brown on wing veins, stigma, tibial spurs, distal half of tarsal claws. Pale-yellow on proximal half of tarsal claws, marginal zones of metasomal sterna. Reddish-brown marked on distal half of mandible.

Structure: Labrum medially flat and without ridges. Clypeal mid-longitudinal area with a strong carina on lower 3/4; adjacent area declivous. Malar area 1.8x as long as basal depth of mandible (45:25). F1 ~1.2x as long as its apical width (34:28). UID:LID (67:66). Genal area flat behind upper summit of compound eyes in lateral view. Dorsolateral angle of pronotum rounded. Horizontal surface of metapostnotum ~0.6x as long as metanotum (21:36); metapostnotal pits poorly-delimited; posterior transverse carina sinuous and interrupted medially. Posteromedial surface of front coxa bearing very short spine (0.3x MOD). Posterior hind tibial spur ciliate. Hind basitarsus ~3.5x longer than broad (53:15). Posterolateral area of S6 flat and lacking carina; marginal zone depressed.

Pubescence: Pale-yellow, plumose, erect, moderately long on lateral slopes of clypeus and supraclypeal area, interantennal, frontal and genal areas (except long near proboscidial fossa), pronotal lobe, mesoscutum, scutellum, metanotum, posteroventral surface of front trochanter and femur, ventral surface of mid and hind trochanters, ventral margin of mid femur, S1; such hairs long on upper margin of lateral surface of propodeum, T1. Paraocular area with pale-yellow and black hairs intermixed. Pale-yellow, erect, moderately short setae on mandible; such hairs long on posterior surface of tibiae (except very long on hind tibia). Fulvous, suberect, short setae on dorsal surface front and mid tibiae; such setae pale-yellow, thick on ventral surface of mid and hind tarsi (thickest towards distal margin). Pale-yellow, suberect, very long hairs, which are branched only apically on anterior surface of hind femur and tibia. T2–T5 and S3–S6 covered with pale-yellow, erect, short setae (except moderately short on T5 and lateral areas of T3–T4); T2 also with plumose hairs. S2 with pale-yellow, erect, moderately short hairs, which are branched only apically.

Surface sculpture: Clypeus longitudinally striate on lower 1/4 and near mid-longitudinal carina; smooth and shiny elsewhere. Malar area with sparse, moderately fine punctures medially; interspaces smooth. Supraclypeal area rugulose below; smooth above. Paraocular area punctures crowded and moderately fine below; dense and fine above (sparsest at antennal socket level); interspaces smooth throughout. Frontal area densely and moderately finely punctate; interspaces rugulose. Vertexal area sparsely and minutely punctate near eye (interspaces smooth); densely and finely punctate medially (interspaces imbricate); rugose near ocellus. Mesoscutum and scutellum moderately finely punctate; moderately densely punctate on former (except sparsely punctate on mid-posterior area), densely punctate on latter; interspaces smooth (except rugulose on scutellar posterior 1/4). Metanotum densely and finely punctate; interspaces rugulose. Mesepisternum moderately sparsely and moderately finely punctate; interspaces imbricate. Metepisternum rugulose above and below; obliquely striate medially. Lateral surface of propodeum imbricate. Upper area of vertical surface of metapostnotum rugose medially. Metasomal terga finely punctate; T1 sparsely punctate; T2–T5 densely punctate; interspaces imbricate throughout. Metasomal sterna finely and moderately sparsely punctate (except moderately finely punctate on S6 mid-longitudinally).

MALE: Unknown.

Material studied. Primary type specimen: Holotype ♀—“HOLO; TIPO”. “CHILE Coquimbo; Baños del Toro; 14 I ’56 3,350m.; (Wagenknecht)”. “ Colletes ; guanta n.sp; Toro & Rojas 93”. “AMNH_IZC 000324329”. {AMNH}.

Additional specimen: CHILE — Region IV: Baños del Toro, (-29.837, -70.026), 3350m, i/1988, [R.Solar], 1♀, { AMNH}.

Range. Chile (Region IV). See also Fig. 3B .

Biogeographic distribution. Andean region: Central Chilean sub-region (Coquimban province). Central Chilean species found at altitudes above 3300m a.s.l.

DNA barcode. Unavailable.

Floral hosts. Unknown.

Comments. Extremely rare species known only from its type locality (Baños del Toro, Region IV). The male remains unknown.

Figures

FIGURE 3. Geographic distribution by Colletes species. (A) C. alocochila and C. cyaniventris; (B) C. arthuri n. sp. and C. guanta; (C) C. atacamensis and C. cognatus. Scale bars approximately 300 km.

FIGURE33. Colletes guanta Rojas &Toro,1993.Female:(A) habitus, lateral view; (B) face, frontal view; (C) habitus, dorsal view.Scale bars = 2mm.