AEDES 8TIMULANS 681 



plumose, the last two joints long and slender, black, rugose, jiilose, the others 

 short, largely black; hairs of whorls long, dense, black and yellowish-brown. 

 Coloration similar to the female. Wings narrower than in the female, the stems 

 of the fork-cells longer ; vestiture sparse. Abdomen long, depressed ; segmental 

 white bands much broader than in the female, the last two segments nearly all 

 white scaled above; lateral ciliation long, abundant and fine, pale yellowish 

 brown. Claw formula, 1.1-1.1-1.1. 



Length : Body about 5 mm. ; wing 4 mm. 



Genitalia (plate 25, fig. 175) : Side-pieces over twice as long as wide, slender ; 

 distal lobe roundedly prominent, continued along the inner margin narrowly 

 toward the basal lobe ; basal lobe quadrately expanded, bearing many small setas 

 with tuberculate bases and a stout double spine. Clasp-filament slender, bearing 

 a few small sets outwardly, at tip a long articulated terminal spine. Harpes 

 slender, concave, inner margins revolute, hooked at tip, point directed outward. 

 Harpagones with a stout cylindrical base, curved, minutely pilose, bearing a 

 terminal filament, which is slightly expanded beyond middle. Unci approxi- 

 mate, revolute, forming an indistinct basal cylinder. Basal appendages stout 

 and approximate, bearing a row of stout setre at the tip. 



Larva, Stage IV (see the figure of the entire larva, plate 63) . Head rounded, 

 wider than long, sides slightly narrowed before eyes, a slight notch at insertion 

 of antennae, front margin broadly arcuate. Antenna moderate, subcylindrical, 

 slightly wider at base, spined all over; tuft moderate, very near middle, four 

 terminal spines of different lengths and a blunt digit at tip. Upper pair of 

 dorsal head-hairs single, lower double ; ante-antennal tuft multiple, short. 

 Mental plate long, triangular; thirteen side teeth, subequal, the end tooth not 

 larger, the basal one detached and smaller. Mandible quadrangular, two fila- 

 ments near tip and an outer row of cilia ; ten filaments on outer edge ; dentition 

 of four teeth not much raised, the first the largest, preceded by a single large 

 curved tooth; a broad serrate filament and six hairs within; process below fur- 

 cate, with hair in patches ; the lower angle forms another process from the base 

 of the first, with a curved tip pointed at one end ; six scattered hairs within ; six 

 stout hairs at base. Maxilla hemispherical, the tip crater-shaped, divided by a 

 suture ; inner half with the hairs on margin erected ; a crown of hairs at tip ; 

 outer half with two filaments and a spine on other sides; palpus broadly 

 attached, constricted at tip, with four small digits. Thorax rounded, wider than 

 long; hairs abundant but not long; prothoracic hairs single and double; large 

 fan-shaped tufts on meso- and meta-thorax. Abdomen rather stout, the anterior 

 segments scarcely shorter; hairs moderate, the laterals double to sixth segment. 

 Tracheal tubes broad, band-shaped, slightly widened in the segments. Air-tube 

 stout, slightly tapered on the apical half, about three and a half times as long 

 as basal width ; pecten teeth dense, evenly spaced, occupying basal third, the 

 single tooth a long spine, wide at base, with seven irregular basal branches; a 

 single hair-tuft of four hairs beyond pecten, before middle of tube. Lateral 

 comb of eighth segment of numerous scales in a triangular patch ; single scale 

 elliptical, fringed with long fine spines, a long smooth spine at tip. Anal seg- 

 ment nearly twice as long as wide, the dorsal plate reaching below middle of 

 sides, roundedly incised in middle of lateral margin ; dorsal tufts a long hair 

 and a tuft on each side; a single lateral hair on plate; ventral brush well 

 developed, preceded by small tufts nearly to the base. Anal gills moderate, about 

 as long as the anal segment, tapered to a rather sharp point. 



The larvas inhabit temporary pools early in the spring. There is but a single 



generation in the year. The adults emerge early in the season, but the females 



live for as much as three months, frequenting forests. They come readily to 



bite by day, but do not frequent houses. The pools preferred by the larv-ae are 



44 



