MAY PLIES AND MIDGES OF NEW YORK 103 



pairs with setae. Mandibles curved, slender at the apex, stout 

 basallj (fig.4). The hypopharvnx lies rather far back from the 

 mouth opening, about on a line with the eje spots. It is curved, 

 like the jawbone of a mammal, the dorsal surface of the middle 

 section being fringed. In fig. 5 this fringe is flattened down. The 

 labium is rounded, and has a single cephalad projecting tooth on 

 its inner surface. Upon the outer surface are t«'o setae on each 

 side (fig.6). The body is wholly devoid of setae excepting at 

 the caudal end. At the caudal end there are eight long setae 

 arranged in four groups of two each (pl.17, fig.3). Besides these 

 there are four very small and delicate ones. The blood gills 

 (retracted in most specimens) are white, short, slender, and 

 lanceolate in outline. 



The pupa is dark brown in color, with the abdomen slightly 

 paler. Length 3.5 to 4 mm. The respiratory trumpet is slightly 

 enlarged at the apical end (pl.lS, fig.9), about five times as long 

 as wide. Upon the dorsal surface is a group of about ten small 

 setae. Upon the dorsal surface of the first abdominal segment 

 there is a group of five or six very small setae on each side. The 

 following segments, excepting the last two, have from 6 to 10 

 setae on the dorsal surface, arranged as shown in fig. 10. Upon 

 the ventral surface each segment has from 8 to 10 very small setae, 

 each placed on the apex of a prominent tubercle (fig.ll) . The anal 

 fin consists of t^'O pointed lobes with blackened tips. 



To Loew's description of the imago (loc. cit.) may be added that 

 the fore and middle tibiae sometimes have one or two stout black 

 setae besides the fine hair-like setae; and in the female each claw 

 has a very small tooth on the inner side. The male genitalia as 

 shown on pi. 32, fig. 1, 



Bezzia sp. 

 (Pl.17, figs. 10 to 12) 



The larvae were taken from the stomach of a brook trout at 

 Saranae Inn, N. Y. They do not appear to differ much from the 

 larvae ofB. setulosa, excepting that the labium possesses 

 three teeth on the inner surface instead of one (fig.lO) . The pupa 

 (fig.ll) may possibly belong to this species, for it is the only 

 species which was found in that vicinity at that time, but of it 

 many specimens were found. The respiratory trumpet is as shown 

 in fig. 12. Each abdominal segment has upon its ventral surface 

 several elongate brown spots. The setae are short, and the basal 

 tubercles smaller and fewer than inB. setulosa. The lobes 

 of the anal fin are elongate and pointed (fig.ll) . 



