CULISETA DUGESI 497 



ones, which are most numerous posteriorly ; margin of eyes and lower part of 

 side white scaled, a row of coarse black bristles along margins of eyes. 



Prothoracic lobes small, remote, with whitish scales and brown bristles. 

 Mesonotum dark brown, with two broad, bare, reddish brown stripes anteriorly, 

 a pair of similar bare stripes on posterior half, at sides of antescutellar bare 

 space; vestiture rather sparse, of larger, narrow, curved golden-yellow scales 

 and patches of small dark brown ones intermixed, scales around ante-scutellar 

 space, a line each side and over root of wing silvery whitish. Scutellum trilo- 

 bate, the median lobe the more prominent, clothed with lanceolate silvery- 

 whitish scales and with a group of black bristles on each lobe. Postnotum 

 rather short, nude, pale brown. Pleurae and coxas pale testaceous, a blackish 

 area between mid and posterior coxse ; vestiture of flat whitish scales in patches 

 and a few fine pale bristles which are more numerous on the coxa. 



Abdomen subcylindrical, somewhat depressed dorsally, truncate apically; 

 dorsal vestiture of black scales, a rather narrow band of white ones at base of 

 each segment; first segment with black and white scales, and many fine pale 

 hairs ; a row of pale bristles at apices of segments ; venter whitish scaled, with 

 segmental, difi^use V-shaped patches of black scales, their points toward the 

 anterior borders of the segments. 



Wings ample; petiole of second marginal cell shorter than its cell, that of 

 second posterior cell also shorter than its cell; basal cross-vein incident with 

 anterior cross-vein ; membrane hyaline, stained with brown at origin of second 

 vein, region of cross-veins, a band across the bases of second marginal and 

 second posterior cells, along the veins at the base of the fourth posterior cell 

 and from there outwardly along the fifth vein to margin ; scales black, appressed 

 ones abundant, large, rather narrow, the outstanding scales sparse and slender ; 

 scales denser on infuscated areas; cross-veins scaled on outer side; fringe 

 blackish at base, paler apically, at wing-tip the long scales distinctly ochraceous. 

 Halteres with white stems and black knobs. 



Legs moderate, slender, black scaled, intermixed with white ones; femora 

 white beneath, on posterior femora forming a diffuse line which widens to a 

 white spot before tip ; tibiae with a white line down inner side ; and a white spot 

 at base and apex ; tarsi of fore and mid legs with a small white band at base of 

 each Joint, broader on outer side, absent on terminal joint ; hind tarsi with broad 

 rings, the fourth joint white on basal half, the fifth on basal third. Claw 

 formula, 0.0-0.0-0.0. 



Length : Body about 5.5 mm. ; wing 6 mm. 



Male. Proboscis straight, moderately long and slender, black scaled, 

 sprinkled with light gray. Palpi long, slightly exceeding the proboscis; apex 

 of long joint and penultimate joint thickened, last joint club-shaped; apex of 

 long joint and last two joints with long dense black hairs, the last two joints 

 with broad pale rings at their bases, the long joint with a broad white ring at 

 middle and a patch of white scales near base. Antennae plumose ; last two joints 

 long and slender, the others short, pale, with black rings at insertions of hair- 

 whorls; hair long, rather dense, black. Coloration similar to the female. 

 Occiput with the forked scales pale. Abdomen elongate, subcylindrical, black 

 scaled above, with basal segmentary white bands, the last segment nearly en- 

 tirely white scaled ; beneath nearly entirely white scaled. Wings much narrower 

 than in the female, vestiture sparser, the stems of the fork-cells longer, basal 

 cross-vein very near anterior cross-vein. Claw formula, 2.1-2.1-0.0. 



Length : Body about 7 mm. ; wing 6 mm. 



Genitalia (plate 35, fig. 235) : Side-pieces over twice as long as wide, slender, 

 rounded at tips, a stoutly conical basal lobe bearing two stout spines; clasp- 

 filament slender, rather long, uniform, with an articulated terminal spine. 

 32 



