392 MOSQTJITOES OF NORTH AMERICA 



8. Air tube with four to ten paired tufts along the posterior line in a 



straight row, none displaced, or the hairs obsolete or absent. 18 



18. Air tube without a crown of spikes, smooth throughout 19 



19. Air tube with long, well-defined tufts 20 



20. Body spicular-pilose 21 



21. Five tufts on posterior margin of tube subequal in length, short; 



lateral abdominal hairs in twos on segments 3 to 5 22 



22. Air tube 6X1; upper head hair multiple; pecten rather long 



inhibitator 



Desceiption or Female, Maze, and Labva of Chlex inhibitatoe: 



Female. — Proboscis moderate, swollen at tip, labellse eonically tapered ; vesti- 

 ture black with a slight bronzy reflection ; setae minute curved, black, those on the 

 labellse more prominently outstanding. Palpi short, one-fifth as long as pro- 

 boscis, slender, black, witii a few outstanding setae at base. Antennae moderate; 

 joints subequal, rugose, coarsely pilose, black, second joint not much longer 

 than third; tori subspherical, with a cup-shaped apical excavation, yellowish, 

 brown on inner side ; hairs of whorls sparse, moderate, black. Clypeus rounded 

 triangular, convex, brown, nude. Eyes black. Occiput brown, clothed with 

 broad appressed blackish scales and many erect, forked bronzy-brown ones, 

 margins of eyes dull-white scaled, a patch of flat white scales low down on sides; 

 a row of bristles along margins of eyes. 



Prothoracic lobes elliptical, remote dorsally, with some brown bristles. Meso- 

 notum luteous brown, clothed with narrow, curved, light bronzy-brown scales 

 and rows of stout black bristles. Scutellum trilobate, with similar vestiture to 

 mesonotum, each lobe with a group of black bristles. Postnotum elliptical, 

 prominent, luteous, nude. Pleurae and coxae pale luteous with a slight greenish 

 tint, with rows of pale bristles. 



Abdomen subcylindrical, tnincate at tip, clothed dorsally with black scales 

 with a coppery or blue reflection, a row of lateral, triangular segmental sordid 

 whitish spots ; venter dark scaled with whitish bands at bases of segments ; long 

 blackish setae at posterior margins of segments above ; tip of abdomen bristly. 



Wings rather broad, hyaline; petiole of second marginal cell about one-fifth 

 as long as its cell, that of second posterior cell shorter than its cell ; basal cross- 

 vein distant about twice its own length from anterior cross- vein ; scales of veins 

 rather dense, brown, with a blue reflection on costa, outstanding ones mostly 

 narrowly ovate on second to fourth vein outwardly. Halteres whitish, with dark 

 knobs. 



Legs moderately long, slender ; vestiture black with a slight bronzy reflection, 

 femora whitish beneath. Claw formula, 0.0-0.0-0.0. 



Length: Body about 2.5 mm.; wing 2.5 mm. 



Male. — Proboscis straight, long, and slender, enlarged towards tip, black 

 scaled. Palpi exceeding the proboscis by more than the length of the last joint, 

 slender, nearly uniform, black, with black bristles on end of long joint and on 

 last two joints; vestiture entirely of dark scales with a bronzy luster. Antennae 

 plumose ; last two joints long and slender, rugose, pUose, black, the others short, 

 whitish, with black rings at insertion of hair-whorls; hairs long, brown, 

 moderately dense. Wings slightly narrower than in the female, the stems of 

 the fork-cell a little longer. Coloration similar to the female. Abdomen long, 

 slender, subcylindrical, enlarged towards apex; lateral pale spots diffuse, not 

 visible from above; lateral cUiation coarse and rather sparse. Claw formula, 

 1.0-1.0-0.0. 



Length : Body about 3 mm. ; wing 2.5 mm. 



Genitalia (plate 12, fig. 83) : Side-pieces over twice as long as wide; tips 

 eonically tapered ; a prominence rising somewhat beyond middle, divided into 

 three branches, outer enlarged apically, bearing six filaments of different lengths. 



