338 MOSQUITOES OP NORTH AMERICA 



The following is an abstract of the table : 



1. Antennae with the tuft outwardly placed, the part beyond slender. . . 5 



5. Air tube three times as long as wide or less 6 



6. Body spicular-granular; pecten of the air tube small, to one-third 



Variants 



Description or Female and Labva of Cbxex baebabtjs (Mam; Unknown) : 



Female. — Proboscis moderate, subeylindrical, uniform, labellae conically 

 tapered, whitish ; vestiture blackish, with slight bronzy luster ; setae small, curved, 

 black those on labeUae more prominently outstanding. Palpi short, one-sixth 

 as long as proboscis, black, with a few outstanding setae. Antennae with basal 

 joints somewhat shorter than apical ones, rugose, pilose, blackish; tori sub- 

 spherical with a cup-shaped apical excavation, blacMsh luteous, slightly prui- 

 nose; hairs of whorls sparse, moderate, black. Clypeus roundedly triangular, 

 small, doubly excavated at base, dark brown, nude. Eyes black. Occiput 

 blackish, clotiied with narrow, curved pale-brownish scales, a darker patch each 

 side of middle of erect, forked black scales, curved white scales along margin of 

 eyes and on sides below; a row of black bristles along margins of eyes, those on 

 vertex pale. 



Prothoraeic lobes elliptical, remote dorsally, blackish, clothed with pale scales 

 and brown bristles. Mesonotum sordid blackish with two narrow, dorsal, im- 

 pressed, bare concolorous lines ; vestiture of dense, narrow, curved, lustrous, dark 

 golden-brown scales, with paler ones around ante-scutellar region and along 

 margins, and rows of dark bristles. Scutellum trilobate, pale brown, clothed 

 with narrow, curved pale scales, each lobe with a tuft of brown bristles. Post- 

 notum elliptical, prominent, brown, nude. Pleurae and coxae greenish luteous 

 with rows of pale bristles and small patches of small white scales. 



Abdomen subeylindrical, truncated at tip ; dorsal vestiture dark brown with a 

 slight bronzy luster, each segment except the first with a yellowish-white band 

 at base, produced mesiaUy, separated laterally from row of spots; a row of 

 coarse brown bristles at tip of each segment; venter dull yellowish-white scaled. 



Wings moderate, hyaline; petiole of second marginal cell one-third as long as 

 its cell ; that of second posterior cell slightly longer than its cell ; basal cross-vein 

 nearly three times its own length distant from anterior cross- vein; scales brown 

 with a blue luster on costal edge, outstanding ones moderately dense, densest 

 on fork of second vein, broadly linear. Halteres pale. 



Legs moderate, femora whitish beneath nearly to tip ; tibiae and tarsi brown 

 with a bronzy and bluish reflection and a paler shimmer beneath. Claw formula, 

 0.0-0.0-0.0. 



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



Larva, Stage IV (plate 101, fig. 336). — Head rounded, widest through eyes, 

 bulging on sides, a large notch at insertion of antennae, front margia arcuate. 

 Antennae thick on basal two-thirds, spined ; a large tuft from a notch, terminal 

 third more slender; two long setae subapicaUy, a long seta, a short seta and 

 a digit at tip. Both pairs of dorsal tufts and ante-antennal tufts multiple, 

 long. Mental plate elongate triangular with a long central tooth and eleven on 

 each side, basal ones a littie more remote, last one small. Mandible quad- 

 rangular ; two long filaments and two short slender ones before tip ; an outer row 

 of cilia from a collar; a row of curved transverse elevations on outer margin 

 bearing hair-tufts; dentition of four teeth on a process, the first longest; spined 

 before, a small tooth and a short trifid one at base, a long serrate filament and 

 seven feathered hairs within ; process below stout, curved, obscurely furcate, with 

 a transverse and a longitudinal row of hairs and tuft at tip of each limb ; basal 

 angle small ; a row of stout hairs within and a row at base. Maxilla elongate, 



