112 INSE;CUT0R INSClfl^ m^nstruus 



eighth segment of many scales in a large triangular patch, 

 four or five scales deep ; basal scales small, becoming larger 

 progressively posteriorly, the terminal scales longest, smooth 

 on the sides, with expanded, minutely feathered tips, all small 

 and weakly colored ; air-tube about one-and-a-half times as 

 long as wide, tapered on the outer half ; pecten not reaching 

 the middle, of closely set spines in a slightly oblique row ; anal 

 segment three-fourths encircled by the plate, a little expanded 

 terminally, the anal gills short and bud-shaped. 



In the monograph, we confused this species under splendens 

 Will. We were puzzled by the unexpected and apparently 

 sporadic occurrence of the larva in rock-holes, and were not 

 able to give any explanation of it. It did not occur to us that 

 a distinct species was involved, for at the time of writing the 

 monograph we could not divorce ourselves from the idea that 

 species of mosquitoes must necessarily be separable on char- 

 acters of adult coloration. That the obvious larval differences 

 between all these forms did not obtrude themselves upon our 

 attention I can only attribute to the fact that the Jennings 

 collections were never fully worked over, owing to Mr. Knab's 

 preoccupation and illness. 



Haemagogus (Haemagogus) janthinomys, new species. 



Head blue, mesonotum green, abdomen dark purple, with 

 the usual play of colors ; pleura silvery scaled ; abdominal lat- 

 eral spots silvery, joined on the basal segments, with more or 

 less silver dorsally also on the posterior segments ; legs dark 

 violet to black, the femora white and silvery below toward 

 base. Male proboscis thick on the basal half, the apical por- 

 tion curved ; palpi about one-fifth its length. Claws of female 

 simple. 



The male hypopygium is figured as "capricornii," plate 24, 

 figure 165 of the monograph. 



Types, two males, paratypes, 4 males and 3 females, No. 

 24335, U. S. Nat. Mus. ; Trinidad, B. W. I. (F. W. Urich, 

 breeding Nos. 17, 21, 22, Bl, B3) ; June, 1905 (A. Busck). 



The larva is described in the monograph under the name 



