CULISETA INOENATUS 491 



narrow, curved scales. Postnotum nude, pale brown, somewhat pruinose, with 

 an elliptical darker brown area on either side. Pleurae and coxae pale brown, 

 slightly pruinose, rather sparsely clothed with elliptical, yellowish-white scales 

 and a few oehraceous bristles. 



Abdomen subcylindrical, depressed, truncate at tip; dorsal vestiture of 

 blackish scales on apical halves of segments, pale oehraceous ones at bases, 

 giving the effect of ill-defined transverse basal bands which widen laterally 

 and join ill-defined, dirty white lateral stripes, last segment almost wholly 

 pale scaled ; first segment with a patch of pale scales and many pale setae ; venter 

 wholly clothed with whitish oehraceous scales. 



Wings rather broad, hyaline, with slightly iridescent reflection ; second mar- 

 ginal cell longer than its petiole; the second posterior cell about equal to its 

 petiole ; basal cross- vein tending to lie in line with anterior cross- vein, distant 

 therefrom less than half its own length; veins with long, narrow, outstanding 

 scales and small, broader appressed ones, veins pale brown, vestiture dark brown 

 mixed with a few whitish scales, which are most pronounced along subcostal and 

 base of first vein. Halteres with pale oehraceous stems and blackish knobs. 



Legs slender, rather long ; vestiture of dark brown and pale oehraceous scales 

 intermixed, the dark ones predominating on tarsal joints which appear nearly 

 black ; femora broadly pale sealed beneath ; tibiae pale scaled beneath and at the 

 sides ; femora and tibiae narrowly whitish scaled at tips ; tarsi unhanded. Claw 

 formula, 0.0-0.0-0.0. 



Length : Body about 6 mm. ; wing 6.5 mm. 



Male. — Proboscis straight, slightly thickened outwardly, clothed with pale 

 brown and oehraceous scales, blackish toward tip. Palpi slender, longer than 

 the proboscis; apical joint thickened, club-shaped; clothed with oehraceous and 

 dark-brown scales, a few pale scales iutermixed; a few long blackish bristles, 

 especially at apex of long joiat. Antennae slender, sparsely plumose ; last two 

 joints long and ciliate, the others short, black, silvery white at apices ; hairs of 

 whorls long, black, not very dense. Coloration similar to the female, the larger 

 narrow, curved scales of mesonotum distiuctly golden yellow. Abdomen elon- 

 gate, depressed, with rather short and irregular lateral ciliation; dorsally the 

 basal yellowish banding is broader, darker, and less distinct than in the female, 

 the lateral pale scales nearly concolorous, the last segment entirely oehraceous 

 scaled ; venter wholly clothed with yellowish white scales. Wings narrower than 

 in the female, the stems of the fork-cells longer ; cross-veins with distinctly less 

 tendency to lie in line, the basal cross-veia often its own length from the 

 anterior cross-vein; costal veins with few or no light scales. Claw formula, 

 3.1-2.1-0.0. 



Length : Body about 5 mm. ; wing 4.5 mm. 



Genitalia (plate 34, fig. 330) : Side-piece very stout, broad, rounded at apex; 

 basal lobe expanded, rounded, setaceous, two of the apical spines very stout; 

 outer lobe undeveloped, unrepresented by setae. Terminal filament enlarged at 

 base, rather short and stout with a small articulated terminal spine. Harpe 

 elongated, slender, apex slightly expanded and divided into two large teeth and 

 one small one on posterior margin. Harpago long, slender, and slightly curved, 

 cylindrical, with a truncate open tip appearing like a slender tube with the tip 

 open and bent, crested by a small angular filament with widely furcate apex, 

 the whole not as long as the harpe. Unci obscure, appearing as a membranous 

 plate. Setaceous lobes transverse, not prominent, each with a row of rather 

 numerous, short, stout setae. Posterior margin of preceding segment unarmed. 



Larva, Stage IV (see figure of the entire larva, plate 78). — Head rounded, 

 abruptly narrowed before eyes, a notch at insertion of antennae, front margin 

 arcuate. Antennae rather small, cylindrical, sparsely spined, tuft a little before 

 middle ; two long and two shorter apical setae and a long digit on a pedicel. Eyes 



