330 MOSQUITOES OF NORTH AMERICA 



In the male the palpi are slightly longer than the proboscis, the apical portion 

 hairy, bronzy-black throughout. Wings narrower than in the female, without the 

 longest and narrowest scales; the coloration similar. 



One male and one female, Las Cascadas, Canal Zone, Panama (A. Busck, collector). 



Type No. 12194, U. S. National Museum. 



Desckiption of Female, Male, and Labva of Culex tbachycampa: 



Female. Proboscis moderate, slightly enlarged at tip, labellse pale, conically 

 tapered; vestiture black with bronzy and blue reflections; setse small, curved, 

 black, those on labellag more prominently outstanding. Palpi short, less than 

 one-sixth as long as proboscis, blackish scaled. Antennae moderate, the joints 

 subequal, rugose, coarsely pilose, black, hairs of whorls sparse, moderate, black; 

 tori subspherical, with a cup-shaped apical excavation, brownish luteous, darker 

 on inner side. Clypeus rounded triangular, blackish, nude. Eyes black. Occi- 

 put blackish, clothed with narrow, curved scales, brown with a strong bronzy 

 luster, scales at sides and margin of eyes broadly ovate ; margin of eyes narrowly 

 whitish, joining a patch below ; many upright, forked black scales with bronzy 

 luster on vertex ; a row of setae along margin of eyes. 



Prothoracic lobes elliptical, remote dorsally, clothed with pale scales and dark 

 bristles. Mesonotum blackish with two narrow impressed bare lines in front ; 

 vestiture of narrow, curved dark-brown scales with bronzy luster; bristles stiff, 

 brown, those around ante-scutellar space and over roots of wings abundant and 

 coarse. Scutellum trilobate, clothed with pale-bronzy scales, each lobe with a 

 group of brown bristles. Postnotum prominent, elliptical, dark brown, nude, 

 vsdth a low, broad median carina. Pleurae sordid grayish brown with patches of 

 sordid-white scales and rows of brown bristles. 



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

 brown scales with submetallic luster, a row of lateral triangular, basal segmental 

 pale spots ; venter clothed with dark scales with basal pale bauds on segments ; 

 tips of segments with rather coarse brown hairs. 



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

 as long as its cell, that of second posterior cell about half as long as its cell; 

 basal cross-vein more than twice its length from anterior cross-vein; scales of 

 veins long, ligulate, brown, with a blue reflection on costa, denser and narrowly 

 ovate on forks of second and fourth veins and outer half of third vein. Halteres 

 pale. 



Legs moderate, femora whitish beneath except at tip ; knees pale ; tibiae and 

 tarsi black with a bronzy and blue reflection. Claw formula, 0.0-0.0-0.0. 



Length : Body about 2.7 mm. ; wing 3 mm. 



Male. Proboscis straight, more slender than in the female, slightly enlarged 

 apically, black scaled with a bronzy luster. Palpi somewhat exceeding proboscis 

 in length, end of the long joint and the last two joints slightly enlarged and 

 bearing long, dense, black hairs ; vestiture of blackish scales with a slight bronzy 

 luster. Antennae plumose ; last two joints long and slender, rugose, pilose, black, 

 the others short but slender, blackish, with pale rings above insertions of hair- 

 whorls; hairs of whorls long, dense, black. Coloration similar to the female. 

 Wings not narrower, the stems of the fork-cells longer, vestiture a little less 

 abundant ; wing-scales somewhat broader, particularly those on forks of second 

 and fourth veins, which are distinctly ovate. Abdomen subcylindrical, some- 

 what enlarged apically, without marked lateral ciliation. Claw formula, 

 1.1-1.1-0.0. 



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



Genitalia (plate 11, fig. 72) : Side-pieces short and stout, about twice as long 

 as wide, tips conically tapered; inner lobe divided into three portions from a 

 common base, outer bearing a large leaf-like appendage, two rods with curved 

 tips and a seta, the other two each a long filament with slightly expanded and 



