OF WASHINGTON. 19 



hairs preceding it ; a tuft at lower angle of plate. Anal pro-gills small, 

 the upper pair about half as long as the segment, the lower pair still 

 shorter. Body dark, blackish pigmented. 



Aedes philosophicus D. & K. (PL III, fig. n). 



Much like H. cyaneus, but the tube more sharply pointed, the comb of 

 few spines in a single row, the single spines sharply thorn-shaped in 

 stead of with feathered tips. 



Wyeomyia durhami Theob. (PI. Ill, fig. 9). 



Head rounded, roundedly angled at the corners ; antennae small, cylin 

 drical, without tuft, pale brown. Hairs on the body rather numerous, 

 moderate, not diminishing much posteriorly, still long on the seventh 

 segment. Air tube short, twice as long as wide, sharply conic, strongly 

 tapered on the outer half; no pecten; hair tufts above and below of two 

 to three hairs. Comb of five or six large thorn-shaped spines, well 

 separated, smooth. Anal segment short, with dorsal plate and no ven 

 tral brush; two addorsal tufts, a tuft at angle of plate and two small 

 subventral ones. Anal gills four, equal, moderate. 



Wyeomyia grayii Theob. (PL IV, fig. 15). 



Head rounded, arcuate before, posterior angles sharp with a small 

 black arc near the angle; antennae small, slender, smooth, without tuft. 

 Body moderate, hairs abundant, the long abdominal hairs single and 

 not diminishing posteriorly. Comb a single row of spines nearly to 

 the ventral line, some ten large ones above continued by smaller spines. 

 Air tube long, six times as long as wide, basal half cylindrical, distal 

 half conic; no pecten; several scattered hairs. Anal segment short, 

 with dorsal plate ; no ventral brush, the tufts addorsal, lateral and sub- 

 ventral. Anal gills four, equal, normal. 



Wyeomyia ulocoma Theob. (PL IV, fig. 17). 



Head round, angled behind, the eyes small, round; antennae small, 

 tapered without, with no visible hair. Thorax quadrate, transverse, 

 with a thorn at the posterior angle of metathorax. Long hairs few, 

 short ones in stellate bunches, dark, conspicuous. Air tube five times 

 as long as wide, tapered outwardly; pecten of four spine-like scales 

 preceded by a hair and followed by two ; several hairs on the dorsal 

 aspect. Comb a thick band of fan-tipped scales covering most of the 

 side, three rows deep, crowded. Anal segment with dorsal plate spined 

 behind ; addorsal and lateral long hairs and subventral small tuft ; no 

 ventral brush. Anal gills long, four, equal, rounded, narrow. 



Wyeomyia asullepta Theob. (PL V, fig. 24). 



Head rounded, angled behind, antennae small, cylindrical, without 

 tuft. Abdominal hairs rather slight, diminishing posteriorly, skin 



