Chilicola tricarinata Packer, n. sp. (Figs. 10A–O) Diagnosis: This species keys out to Oediscelis in Michener (2000) being more narrowly related to the group lacking a process on the first metasomal sternum in the male, this group previously having been placed in a separate subgenus, Oediscelisca, by Moure (1946), a subgenus that should be resurrected (Packer, in press). Within the described species of this group, Chilicola tricarinata is most similar to C. dalmeidai Moure, from which it differs primarily in the narrower hind tibia in the male (Fig. 10D). In comparison to the large number of other new species in the “ Oediscelisca ” group available to us, the form of the hind tibia of the male is diagnostic for this species except for an additional species from southern Argentina that is described below. This latter species has the hind leg almost entirely blackish-brown, with only a small yellow spot on the outer surface of the hind femur and the extreme apex and ventral margin of the tibia yellow and the punctures on the frons are not crowded and sharp-edged as they are in C. tricarinata but separated by approximately their own diameter, the interspaces being quite shiny in contrast to the entirely dull frons in C. tricarinata. It is often not possible to differentiate females in this group (L. Packer, unpublished data). Description. Male: Body length 5.0mm, forewing length 3.3mm, head width 1.05mm. Colouration: Black with following parts yellow: labrum, mandible (except apex red), clypeus, apical half of anterior surface of scape (orange basally), spot on pronotal lobe and ventral-most portion of apical swelling of hind tibia. Following parts orange-tan: anterior surface of pedicel and flagellum, anterior surface of fore and mid femora and tibiae, stripe on anterior surface of hind femur, broad at base and extending almost to apex; most of ventral surface of hind tibia. All tarsi dark brown. Tegula pale amber with large yellow anterior spot. Wing veins dark brown. Apical impressed areas of metasomal terga pale amber. Metasomal sterna brown, S4–S6 suffused with pale brown. Surface sculpture: Microsculpture moderately dense giving dull appearance except on face below antenna, genal area, legs and apical halves of metasomal terga. Labrum shiny with irregular punctation, i=1– 4d. Clypeus particularly shiny. Punctation on clypeus, supraclypeal area and lower paraocular area irregular, i=1–3d. Frons with punctures crowded, edges sharp. Vertex rugulose. Gena with weak striae and shallow obscure punctures. Pronotum and mesoscutum densely punctate, i

Published as part of Packer, Laurence & Genaro, Julio A., 2007, Fifteen new species of Chilicola (Hymenoptera: Apoidea; Colletidae), pp. 1-55 in Zootaxa 1468 on pages 29-33, DOI: 10.5281/zenodo.176627