Robustagramma robustinervus, 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 : 30

Robustagramma robustinervus group

Diagnosis: Two orbital bristles; postocellar bristles absent. Arista subequal to or longer than head height; aristal hairs over twice as long as basal width of arista.. Facial ridge between antennae distinctly broader than width of scape. Dorsocentral bristles in 2 postsutural pairs, anterior dorsocentral bristle slightly longer than middle prescutellar acrostichal bristles. Mid tibia with a single posterodorsal proximal bristle, an anterodorsal bristle near middle, and an anterodorsal, dorsal and posterodorsal distally; dorsal bristle very small. Wing of male with first costal sector thicker than second costal sector. Maximum width of palpus about 1/4 as long as palpus. Sternite 5 large but simple. Ducts of spermathecae about 1.5 times as long as spermatheca. Male with a pair of exceptionally large ventral sclerites, over 0.7X as long as distiphallus.