FRUIT FLIES OF GEITUS TOMOPLAGIA — ACZEL 325 



(black to yellowish brown) but their presence or absence is nearly 

 always constant in the species. Mesonotum usually covered with 

 dense dusting except for a narrow margin in front of scutellum, 

 which is shining; dusting may be silky white, whitish or pale to light 

 brass yellow. Visible black spots covered with black dusting. Dust- 

 ing of mesonotum in majority of species even and uniform, without a 

 trace of vittae, but in some species vittae present; these may be 

 composed of differently colored dusting or may be structural. In 

 many species the ground color of mesonotum vittate or spotted with 

 black, but these black markings not visible without the removal of 

 dusting (see figure, in which the contours of the black vittae have 

 been marked by dotted lines). Three darker almost linear vittae on 

 the uniformly dusted mesonotum of several species (one median and 

 two lateral on dorsocentral line), visible only from behind; these 

 vittae are structural, that is, composed of minute squamulae of the 

 same color as the other apressed ones, but slightly raised. Insertion 

 points of some mesonotal bristles of some species conspicuously large, 

 shining and dark colored. Hairs of mesonotum short, somewhat 

 thickish and apressed, usually pale yellow in color. The following 

 thoracic bristles present: One pair of humerals (h), one pair of pre- 

 suturals {prst), two pairs of notopleurals {npl), one pair of dorso- 

 centrals {dc), one pair of supra-alars (sa), two pairs of postalars {jpa), 

 one pair of prescuteUars {prsc) , two pairs of scutellars {sc) , one pair of 

 sternopleurals {st), two pairs of mesopleurals {mpl) and one pair of 

 pteropleurals (ptpl); aU brownish yellow and somewhat flattened. 

 As in Blepharoneura, Hexachaeta, etc. (tribe Acanthorheurini) species 

 dorsocentrals and prescuteUars stand almost in a transverse line with 

 the upper postalars very near the scutellar suture; prescuteUars very 

 closely spaced. There appears to be little doubt that the dorso- 

 centrals and prescuteUars represent the posterior pairs of dorso- 

 centrals and achrostichal bristles (acr=prsc)', posterior pair of noto- 

 pleurals slightly shorter than, to one-half as long as anterior; ratio 

 of lengths of the two pairs of mesopleurals may be more diverse in the 

 various species; lower postalar (pa = infra-alar) shorter than the upper 

 in all species. 



Scutellum shining, with some yellow, brownish yellow, or nearly 

 black hairs laterally. Apical pair of scutellars parallel or convergent 

 and crossing, nearly as long as, to two-thirds as long as, basal pair. 



Basic wing pattern, unique in subfamily Trypetinae, consists of five 

 diagonal translucent yellow bands, usually with more or less distinct, 

 sometimes interrupted, translucent brown to dark brown distal 

 borders and tips. The three median bands attain posterior wing 

 margin, but the fifth (basal) strongly abbreviated in the majority of 

 species, usually forming an irregular transparent spot or an indistinct 



