CULEX ERRATICUS 383 



hairs; cilia coarse and rather long; tori subspherical vnth a cup-shaped apical 

 excavation, liitcous, brown on inner side. Clypeus large and very prominent, 

 constricted at base, rounded in front, brown. Occiput dark brown, clothed on 

 vertex with broad, flat scales and narrow, ciirved ones intermixed ; the narrow, 

 curved ones golden, flat ones black with a gray luster; ocular margin and cheeks 

 white scaled; scattered erect, forked scales above, black on sides, brown ones in 

 the middle. 



Prothoracic lobes elliptical, remote dorsally, clothed with whitish scales and 

 dark setae. Mesonotum brown, clothed anteriorly with dull golden scales en- 

 closing two dark spots, posteriorly bronzy-brown scales with six ill-defined 

 golden median, submedian, and lateral longitudinal stripes ; scales rather large 

 and dense, narrow, curved; seta? coarse and abundant, particularly posterior 

 ones. Scutellum trilobate, with median lobe very large, clothed with pale- 

 golden scales, each lobe with a tuft of long coarse setae. Postnotum elliptical, 

 brown, nude. Pleurae brown, coxas paler, with patches of white scales and rows 

 of short brown bristles. 



Abdomen subcylindrical, tip truncate ; vestiture above of sooty scales ; second 

 segment with a median basal triangular yellowish-white patch or narrow band 

 mesially produced and similar small ones oil third, fourth, and fifth segments ; 

 segments '^dth large lateral patches of coarse white scales occupying basal halves ; 

 venter clothed with sooty scales with whitish basal bands ou all segments ; pos- 

 terior margins of segments with coarse and long pale cilia. 



Wings rather broad; second marginal cell very long, about six times as long 

 as its petiole; second posterior cell much shorter; basal cross-vein more than its 

 own length before anterior cross-vein ; scales brown, rather broadly linear, long 

 and dense, those near tip of wing broadened, giving the effect of greater density. 



Legs moderate, vestiture black with a bronzy and blue luster ; femora pale be- 

 neath, except at apices; knees and apices of tibiae yellowish. Claw formula, 

 0.0-0.0-0.0. 



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



Larva, Stage IV (plate 105, fig. 349). Head rounded quadrate, wider than 

 long, sides nearly straight, a distinct notch at insertion of antennae, front 

 margin arcuate. Antennae cylindrical, curved, a notch at outer third bearing a 

 very large hair-tuft; densely spined except towards tip; two long subapical 

 hairs, apically one long and one short one and a digit on a pedestal. Eyes larges, 

 transverse, pointed. Upper pair of dorsal head-hairs small, multiple, lower 

 pair long, single; ante-antennal tuft multiple. Mental plate small, a single 

 large tooth and four on each side, the last much smaller. Mandible quad- 

 rangular, short and thick; nearly square in outline; two filaments before tip; 

 a row of cilia from a collar; dentition in line with outer margin ; a single large 

 tooth with two small ones below on a slight process; two spines before, two 

 large and a series of small teeth below, a broad smooth filament, a smaller 

 serrate one and six feathered hairs within; process below swollen, constricted 

 before tip, with two rows of hairs; basal angle small, slender; a row of hairs 

 within ; a row of long hairs at base. Maxilla conical, divided by a suture ; inner 

 half hairy toward base ; a row of long hairs at tip along the suture ; outer half 

 with some hair next the suture, two filaments near base and a small subapical 

 spine. Palpus extremely small, with four apical digits, which, though small, 

 are half as long as palpus. Thorax rounded, wider than long; hairs abundant 

 and very long, subdorsal prothoracic ones single. Abdomen moderate, anterior 

 segments shorter ; lateral tufts multiple on first three segments, triple on fourth 

 to sixth ; secondary hairs in long tufts on third to sixth segments ; skin distinctly 

 pilose throughout. Air-tube long and slender, uniform, scarcely tapered, six 



