602 MOSQUITOES OF NORTH AMERICA 



apical halves of segments with flat white scales which form a continuous band, 

 wider in the middle and diffused on the last two segments; sides with an 

 irregular row of white scales forming an indefinite line ; first segment clothed 

 with white scales and with many pale hairs; venter clothed with sordid-white 

 scales, with a few black ones subapically, on seventh segment forming lateral 

 dark brown spots; setae short, black dorsaUy, golden ventrally. 



Wings rather broad, hyaline, iridescent; petiole of second marginal cell 

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

 vein rather less than its own length distant from anterior cross-vein; veins 

 brown ; scales black and white intermixed, the black ones predomiMting, those 

 along veins small, broad, triangular, the outstanding ones on apical half of 

 wing sparse, very narrow, dusky. Halteres entirely pale. 



Legs moderately long and slender; femora clothed with white scales below 

 towards base, upper side and tips with black and few white scales intermixed, 

 extreme base and apex yellowish-white, a narrow white subapical ring; tibias 

 black with white scales evenly intermixed, not forming spots; tarsi black, 

 basally with white scales intermixed, each joint with a narrow white basal ring, 

 on fore and middle tarsi almost obsolete and with the last two joints entirely 

 black. Claw formula, 0.0-0.0-0.0. 



Length : Body about 4.5 mm. ; wing 3.5 mm. 



Male. — Proboscis straight, uniform, a narrow yellowish white ring beyond 

 middle. Palpi exceeding the proboscis by nearly the length of the last two 

 joints, which are long, subcylindrical, hardly enlarged, upturned; vestiture 

 black, a narrow white ring at bases of last two joints and near middle of long 

 joint; end of long joint and last two joints with abundant, rather short, brown 

 hairs. Antennae plumose, the last two joints long and pilose, the others short, 

 black at insertions of the hair-whorls, whitish beyond; hairs of whorls long, 

 dense, brown. Coloration similar to the female. Abdomen long, slender, de- 

 pressed beyond middle, the white apical segmental bands narrower than in the 

 female, the last one divided in the middle ; lateral ciliation long and abundant, 

 pale brown. Wings much narrower than in the female, the stems of the fork- 

 cells longer, the vestiture less abundant. Claw formula, 1.0-1.0-0.0. 



Length : Body about 5 mm. ; wing 3 mm. 



Genitalia (plate 21, fig. 151) : Side-pieces more than twice as long as wide, 

 conically tapered, apical lobe undeveloped, basal lobe absent; clasp-filament 

 stout, strongly swollen medially, a short, stout, articulated terminal spine. 

 Harpes flat, concave, inner margin thickened and revolute, cleft at tip, forming 

 two teeth directed outwardly. Harpagones with a slender ligulate base and 

 broadly triangular tip bearing six stout setae on elevated bases. Unci contiguous, 

 forming a stout, truncate-tipped cone. 



Larva, Stage IV (plate 116, fig. 396 ) . — Head transverse, widest through eyes ; 

 antennae rather long, slender, with small spines, a small tuft before the middle. 

 Both pairs of dorsal head-hairs single, ante-antennal tuft in fours. Lateral comb 

 of eighth segment of six scales on a weak chitinous plate, each scale with spinules 

 at margin and a long central spine. Air-tube inflated, fusiform, over three times 

 as long as width at base, the pecten of six or seven teeth, closely placed except 

 the last one ; tuft minute, before apical third. Anal segment longer than wide, 

 ringed by a chitinous band ; dorsal tuft of a long hair and tuft on each side ; 

 ventral brush well developed, running along ventral line nearly to base. Anal 

 gills long, tapering, equal. 



The larvae develop rapidly in temporary puddles. Dr. Grabham obtained eggs 

 from captured females. The eggs were laid separately upon the surface of 

 water. They were " comparatively large, about f mm. long, and somewhat nar- 

 row and covered with hollow papillae curved at their apices towards the narrow 



