Chilicola (Oroediscelis) roigi 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 : 23-25

Chilicola (Oroediscelis) roigi Packer and Dumesh , new species

urn:lsid:zoobank.org:act:5CCFEE1F-AA2E-448B-B2BF-E25F3C11E5E1

( Figs. 61–67 , 112 , 115 , 133 , 138 , 140 )

Diagnosis. The combination of processes of S4 short and truncate, lower paraocular area and apex of clypeus yellow and metabasitarsus with ventral lobe not bigibbous is diagnostic for male of this species. The male is most similar to C. carpenteri , but the latter species has the clypeus black and S4 projections acute. Both species have a distinctly bipunctate T1 and mesepisternum. The female can be differentiated by the combination of: malar space as long as wide; upper ocular area shallowly punctate and metapostnotum with dense striae throughout, reaching posterior edge. This is one of three species, which have such a long malar space. The others are C. espeleticola and C. bigibbosa ; the former is distinctive in its long and dense pubescence on the head and mesosoma ,while the latter can be differentiated by the deeply and coarsely punctate upper ocular area and sparse and short striae on the metapostnotum.

Description. Male: Length 6.8 mm; forewing length 4.95 mm, head width 1.5–1.7 mm.

Head: 1.3 X as long as wide, 101:77. Clypeus with transverse apical yellow band, paraocular area yellow to half way up subantennal suture, upper margin of marking truncate; mandible with small basal yellow maculation. Clypeus and supraclypeal area imbricate, punctures small, i=1–3 d; lower paraocular area more regularly punctate, i=1–2 d; frontal area punctures deep, crowded, somewhat alveolate. Malar space as long as wide; lower ocular tangent at approximately basal 1/3 of clypeus. Longest hairs on face <3 MOD, above antennal socket; genal beard hairs <4 MOD. F1 shorter than F2 on anterior surface (11:12.5) equally long on posterior surface (14:14); F2–F4 with two long apical setae, longest subequal in length to succeeding flagellomere, shortest 0.5X as long.

Mesosoma : pronotal punctures small, i~d. Mesoscutum somewhat shiny, mesoscutellum shinier, punctures on both distinct, i<d; metanotum irregularly punctate, i=0.5–1.5 d; mesepisternum doubly punctate, scattered minute punctures among more abundant larger ones, i=1–3 d; metepisternum irregularly punctate throughout. Metepisternum weakly striate above, imbricate below; metapostnotum much shorter than mesoscutellum (15:21), striate, striae often interrupted; lateral surface of propodeum imbricate, shallowly punctate. Longest hairs of mesosoma on procoxa and mesepisternum, <2.5 MOD, most hairs of mesoscutum <1 MOD. Stigma shorter than marginal cell on wing margin (34:44); marginal cell slightly set off from leading edge of forewing beyond, apical half apex rounded; distal stigmal perpendicular beyond first submarginal crossvein. Profemur unmodified; mesofemur weakly concave basoventrally; metafemur with posteroventral margin rounded, apical 1/3 concave. Metatibia less than 3 X as long as greatest depth (62:22) which is both at apex of apical tooth of inner crest and at the peak of the crest itself; inner crest straight to the concavity that is basal to apical tooth, tooth triangular; transverse crest absent but ventral surface strongly convex; apical fifth with patch of dense plumose hairs on outer surface. Metabasitarsus slightly shorter than remaining tarsomeres combined (45:49), ventral process at basal 2/5 coincident with anterior process which is broadly rounded in ventral view.

Metasoma: somewhat dull due to microsculpture, apical impressed areas weakly transversely shagreened. T1 doubly punctate, scattered minute punctures among more numerous larger, irregularly spaced punctures, i=0.5–3 d; punctures anterior to apical impressed area i<2d; T2–T4 more distinctly punctate, i=1–3 d; T5 sparsely punctate, i=3–5 d. Apicolateral patches of white, plumose hairs on T1–T2. S1 erect hairs longish throughout, ~1.5 MOD; S2 and S3 erect hairs longest posterolaterally, <2.5 MOD; S4 erect subapical hairs 2 MOD; S5 erect marginal robust setae curved mesad at apex, 2 MOD, absent medially; S6 subapical tuft <2 MOD. S1 unmodified; S2 with longitudinal sublateral ridge, somewhat truncate in profile, longest anteriorly; S3 with weak swelling; S4 sublateral process short, <1 MOD, truncate, apex 0.7MOD; S5 unmodified; S6 lacking fovea, surface flat, apical impressed area somewhat distinct, ~0.7MOD, subapical setae short <0.5 MOD, appressed to apical impressed area.

Terminalia : refer to Figs. 63–65 .

Female: As for male except for usual secondary sexual characteristics and as follows: Length 6.6–7.0 mm; forewing length 4.6 mm, head width 1.6 mm. Head 1.3 X as long as wide (101:77). Clypeal punctures larger than those of supraclypeal area; frontal area punctures shallow, not crowded, i<d, very shallow anterior to ocellar triangle; T1 minute punctures relatively more numerous, T1–T3 with minute punctures on anterior half of apical impressed areas. Facial fovea comparatively indistinct, weakly imbricate; mesoscutum and mesoscutellum microsculpture stronger; metapostnotum with striae less often interrupted and weakly anastomosing. Ratio of metapostnotum: mesoscutellum longer, 19:21.

Material studied. Holotype male: ARGENTINA, Salta, Quebrada Escoipe , 1700m, 29.vii.1992. A. Roig Alsina [ MACN] . Paratypes: ARGENTINA, Salta, Chorrillos , iii.1993, M. Fritz, one female [ AMNH] ; ARGENTINA, Salta, El Maray , ii.1994, M. Fritz, one male [ PCYU]; same data except i.1994, one male [ PCYU] ; ARGENTINA, Salta, El Alisal, M. Fritz, xii.1993, one male [ AMNH] [See Figs. 184–185 for distribution map] .

Etymology. The species is named after the collector of the holotype, Arturo Roig Alsina, in recognition of his great contributions to melittology in general and of Argentinean bees in particular.

Comments. Although the male holotype and the only female specimen come from different named localities, they are only separated by approximately 125km and the morphological similarities, particularly in terms of the length of the malar space and doubly punctate mesepisternum and T1, strongly indicate that they are the same species.

Figures

FIGURES 61–67. Chilicola roigi. 61. male lateral habitus (paratype); 62. male face (paratype); 63. male genital capsule, dorsal view (paratype); 64. male S7, dorsal view (paratype); 65. male S8, dorsal view (paratype); 66. female lateral habitus (paratype) 67. female face (paratype).

FIGURES 112–114. Faces to show extent of yellow maculation. 112 and 113. yellow on lower paraocular area extensive (C. roigi paratype, C. carPenteri holotype); 114. yellow on lower paraocular area considerably reduced (in most taxa coming out in the second half of couple 18, this area is entirely black) (C. brzoskai).

FIGURES 115–116. Oblique view of metasoma to show processes of S4: 115. broadly rounded (C. roigi paratype); 116. acute

FIGURES 133–134. Heads, side view to show relative length:width of malar space. 133. L~=W (C. roigi paratype); 134. L<0.75W (C. boharti paratype).

FIGURES 137–138. Heads anterodorsal view, to show punctures of frontal and upper paraocular areas: 137. deep and distinct (C. bigibbosa); 138. shallow, less distinct (C. roigi paratype).

FIGURES 139–140. Metapostnotum, dorsal view, to show relative lengths of striae: 139. not attaining posterior margin of dorsal surface of metapostnotum (C. bigibbosa); 140. most striae attaining posterior margin (C. roigi paratype).

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.