Xenochilicola haroldotoroi Genaro and Packer

Genaro, Julio A. & Packer, Laurence, 2005, A revision of the genus Xenochilicola (Hymenoptera: Apoidea, Colletidae), with the description of a new species, Zootaxa 1054, pp. 1-14 : 11-13

Xenochilicola haroldotoroi Genaro and Packer , n. sp.

(Figs. 3, 6, 18–21)

Diagnosis. Male. The dark metasoma with brown marginal zones differentiates the new species from X. diminuta . The length:width ratio of the face, in frontal view is (1.12:1.01), intermediate between X. mamigna (0.92:0.90) and X. diminuta (1.01:0.84). Mesoscutellum densely punctured (i<d). S5 with lateral brushes of hair ( Fig. 18 ), as in X. mamigna ( X. diminuta has a distinct lateral hairy process, Fig. 14). S7 with large disc (in X. diminuta it is small) and without lobes; the form of the apodemal arms differ from the other species ( Figs. 10 , 15 and 19). S8 with the median apical process shorter than in other species (compare Figs. 11 , 16 and 20). Males are larger than those of the other two species.

Description. Male. Body length 3.10–3.50 mm, forewing length 2.10–2.30 mm (Fig. 6).

Colouration. Black with yellow on mandible (except apex dark brown), labrum, clypeus, and spot on malar space, scape and pedicel ventrally, spot on pronotal lobe and tegula; apices of femora (on forefemur reaching midlength ventrally), whole foretibia, mid and hind tibia dorsally, all tarsi; following parts brown: antennal flagellum, wing veins, marginal zone on metasomal T1–T5 (in some specimens whole T5), T6, median areas on apical margins of sterna.

Surface sculpture. Microsculpture imbricate except: labrum, supraclypeal area, frons and vertex with surface shiny. Labrum with dense, coarse punctures, clypeus with sparse shallow large punctures, gena with punctures longitudinally effaced (i>>d). Frons, paraocular area and vertex punctate­reticulate; supraclypeal area irregularly punctate, mesoscutum irregularly punctate (i~d on disk, i<d medially), mesoscutellum (i<d) and mesepisternum (i<d), metanotum coarsely punctate; preepisternum reticulate­punctate, hypoepimeral area with longitudinal striae, becoming reticulate above, irregularly punctate (i<d; i=1–2d on disk); propodeum with dorsal and lateral surfaces reticulate, lateral surface irregularly punctate on dorsal half (i=1–2d); T1 irregularly punctate (i=0.5– 3d on disk; i<d at sides; acarinarium impunctate); T2 weakly punctate, T5–T6 with few sparse punctures.

Pubescence. White, short and appressed on lower paraocular area, posterior margin of pronotum and anterior margin of mesoscutum; long sparse hairs (>1MOD) on clypeus, frons and vertex; shorter and denser on gena, pronotum, mesoscutum and mesoscutellum (>MOD); denser, shorter hairs on mesepisternum and propodeum (~MOD); legs with short hairs, sparse on femur and tibia (<MOD); metasomal terga with short sparse hairs (=0.3 MOD), longer on anterior margin of T1, and apical margin of T6 (~1MOD); lateral brushes of long hairs on apical margin of S5 (~2MOD).

Structure. Head slightly longer than broad (1.10–1.14 mm long; 1.00– 1.02 mm broad, N=4, Fig. 3); stipes and cardo very long (~ 6.5 MOD), stipes slightly longer; clypeus convex, projecting 0.4–0.5 of its length below lower margin of eyes, apical margin of clypeus slightly concave; labrum transverse width:length (4:1), with apical margin slightly more convex than in previous species, gena narrower than eye width, in lateral view (2.0:2.3). OOC:IOC (11:19), UOD:LOD (57:38), LMA:MW (7:10). Basal area of propodeum same length as metanotum and about one third as long as mesoscutellum, in dorsal view (10:10:27). S5 with posterior margin deeply concave with central portion convex ( Fig. 18 ); medio­apical protuberance on S6.

Terminalia . S7 with disc large, without apical lobes; apodemal arms rounded ( Fig. 19 ). S8 similar to X. mamigna except the apical process short, not hairy ( Fig. 20 ). Genital capsule as in Fig. 21 ; volsella with digitus not extending beyond cuspis.

Female: unknown.

Comments. X. haroldotoroi n. sp. is intermediate between the other two species of the genus in several features: the ratio of length to width of the head and the relative length of the malar area; antenna with flagellomere I modified, expanded at apical margin on outer side, as in X. diminuta ; mesoscutellum slightly longer in this species than in the others.

Etymology. We take pleasure in naming this species after the collector of the holotype, the late Dr. Haroldo Toro, who made such a large contribution to our understanding of the systematics of South American bees.

Material Examined: ( Fig. 13 ) Holotype male. CHILE, Región II, [Pan American Highway], Km 1680, 4.x.1997, H. Toro coll. ( AMNH). Paratypes: same data as holotype, except one specimen collected by M. Hormazábal. Holotype and one paratype at AMNH, one paratype each at Universidad Católica de Valparaíso, Chile and York University, Canada. All specimens collected at Prosopis tamarugo Philippi (Mimosaceae) . The junior author could find no P. tamarugo at the type locality when he visited the area in April 2004.

Figures

FIGURE 13. Distribution of Xenochilicola species. X. mamigna; X. diminuta; X. haroldotoroi n. sp.

FIGURES 18 – 21. Xenochilicola haroldotoroi n. sp. male: 18. ventral surface of S 5; 19. S 7; 20. S 8; 21. genitalia. Dorsal views to left, ventral to right.

FIGURES 10 – 12. Male of Xenochilicola mamigna: 10. S 7; 11. S 8; 12. genitalia. Dorsal views to left, ventral to right.