896 MOSQUITOES OF NORTH AMERICA 



verse bands and several patches on and near apex, one of the bands crosses the 

 wing obliquely from the costa to the fifth vein at the basal third, the second 

 band about two-thirds from the base extends from the costa to upper branch 

 of fifth vein; a large yellow costal patch just in front of outer white band; 

 scales large, very broad, and obliquely subtruncate, Halteres pale, the knobs 

 abundantly clothed with black scales. 



Legs comparatively short, femora rather stout; vestiture of dusky scales 

 vrith yellow ones intermixed and with numbers of illy defined, more or less 

 broken, white transverse bands on femora and tibiae; mid and hind legs with 

 tufts of long black outstanding scales involving apical portion of femora and 

 basal portion of tibise ; anterior tarsi with basal and median white dorsal spots on 

 first joint, second and third joints with white dorsal spot on basal two-thirds, 

 a minute white spot at base of fourth and apex of fifth joints ; middle tarsi with 

 bases and apices of first and second joints narrowly white marked and two white 

 spots mesially on first joint, third and fourth joints basally broadly white 

 marked, a small white spot at apex of fifth joint; hind tarsi with the first joint 

 showing two white spots on median portion and another one at apex, second 

 joint narrowly white marked at base and apex, third joint basally white nearly 

 to middle, fourth joint white, the apical third black, fifth joint white and with 

 an apical black spot beneath. Claw formula, 0.0-0.0-0.0. 



Length : Body about 3 ram. ; wing 2.6 to 3.8 mm. 



Male. Proboscis straight, somewhat longer and more slender than in the 

 female; the spot at the base white instead of yellow. Palpi short and stout, 

 about one-fifth as long as the proboscis; vestiture of broad roughened scales, 

 black, the apices white, an ocher-yellow ring at middle and with scattered 

 ochreous scales on basal half. Antennae plumose, last two joints rather long, 

 thicker than the preceding ones, rugose, their ciliation long, the other joints 

 shorter, pale, black at insertions of hair-whorls ; hairs very long, dense, brown. 

 Abdomen long, subcylindrical, somewhat depressed, sixth and seventh seg- 

 ments expanded posteriorly; claspers not exposed; dorsum mottled with 

 ochreous scales, each segment with a pair of large sublateral apical spots of 

 white scales; first abdominal segment with dark scales on disk, broadly mar- 

 gined behind with whitish scales and with similar scales on front margin; 

 eighth segment apically with white scales; lateral ciliation long, abundant, 

 coarse and irregular, yellowish. Coloration otherwise as in the female. Wings 

 hardly narrower than in the female, vestiture nearly as dense. Claws long and 

 slender; formula, 0.0-1.0-0.0. 



Length : Body about 3.5 mm. ; wing 3 mm. 



Genitalia (plate 38, fig. 255) : Side-pieces about twice as long as wide, tips 

 rounded, a small subbasal lobe more densely setose than the rest of side-piece ; 

 clasp-filament rather short, stout, uniform, a stout claw at tip with many fine 

 supplementary claws. Harpes and harpagones absent; unci forming a large 

 basal prominence with double rod-like base and broad rounded tip. 



Larva, Stage IV (plate 129, fig. 450). Head flattened, broad and trans- 

 verse, subquadrate, posterior angles rounded, sides bulging at the eyes, anterior 

 margin flatly arcuate. Antennae inserted in a notch, large and very stout, 

 strongly curved, with a large hair-tuft at the middle; tip squarely truncate, 

 with a stout spinose digit nearly as long as half of shaft, and three very long 

 stout setae; the digit has an articulated appendage at the tip; shaft minutely 

 spinulose, colorless, hollow, except for basal muscle, tendons attached to the 

 terminal digit and to central hair-tuft, and nerve fibers. Eyes narrow, strongly 

 transverse, with a small patch of pigment behind. Upper pair of dorsal head- 

 tufts in fours, lower pair small, multiple, a still smaller pair of tufts below; 

 ante-antennal tufts large, multiple. Oral aperture wide, all the parts exposed. 

 Mouth-brushes well developed, bent down over the mouth-parts. Mandible 



