Robustagramma sinuosum Cui and Marshall, 2005

Marshall, Stephen A. & Cui, Yongsheng, 2005, Systematics of Robustagramma, a new genus of New World Sphaeroceridae (Diptera), Zootaxa 1026 (1), pp. 1-122 : 86-88

Robustagramma sinuosum Cui and Marshall , new species

( Figs. 257–263 )

As described for Robustagramma biangulatum except as follows.

Boby length 1.0– 1.4 mm. General color brown to dark brown, moderately pollinose, without conspicuous pigmentation. Face, gena and lower frons reddish brown. Facial ridge relatively narrow. Male facial ridge between antennae as wide as width of scape. Female facial ridge between antennae slightly broader than width of scape. Eye height ca. 2.1–2.4 times genal height. Posterodorsal katepisternal bristle short, half as long as distance between bristle base and wing base. Wing almost clear, length of second costal sector ca. 0.40–0.44X length of third. Mid femur usually with only one anterior preapical bristle. Mid tibia of male with small ventral bristles on distal third. Mid femur of male with 7 ventral proximal bristles. Abdomen short and stout.

Male terminalia: Dorsomedial length of epandrium similar in length to sternite 8. Sternite 5 with stout bristles near posterior margin. In lateral view, ventral apex of sturstylus truncate; cercus slightly sinuate at middle. Ejaculatory apodeme only 1/4 as long as aedeagal apodeme.

Female terminalia: Paired spermathecae with distal portion similar in length to basal portion, and with duct nearly 3 times as long as spermatheca. Single spermatheca with duct short, subequal to length of spermathecal body.

Holotype (♂, DEBU) and paratypes (4 ♂, 2 ♀, DEBU): GUYANA: Rupununi Dist. , Kurupukari, E. side Essequibo, 200ft, R. savannah scrub/primary rainforest edge, malaise, 11–16.x.1990, B. Hubley and L. D. Coote.

Other paratypes: GUYANA: Mazaruni­Potaro Dist. , Tukeit Falls, Potaro R., 300ft., primary rainforest, human dung trap, 27–29.ix.1990, B. Hubley (2 ♀, DEBU). VENEZU­ ELA: Bolívar, vi–12vii.1987, Evergreen Dry Forest, FIT, S. & J. Peck (1 ♂, DEBU) .

Etymology: The specific epithet refers to the sinuate cercus of the male in the lateral view.

Figures

FIGURES 257–263. Robustagramma sinuosum sp. nov.: 257, posterior view of male terminalia; 258, lateral view of male terminalia; 259, lateral view of male internal genitalia; 260, male sternite 5; 261, dorsal view of female terminalia; 262, ventral view of female terminalia; 263, spermathecae.