AQUATIC INSECTS IN NEW YORK STATE 323 



lateral ones two or three times as long as the median ones and 

 on the outer angles of the labrum, with six discal setae, the 

 distal and median pairs in a line distad of the anterior pair of 

 sensory pits, subequal in length, the proximal pair twice as long, 

 stout, with two lateral setae, which are stout and near the mid- 

 dle of the lateral margin, and with four sensory pits [pl.26, 

 fig.l3] ; the anterior and posterior tergal setae continuous and 

 coalesced laterally with the supraspiracular setae; the su- 

 praspiracular setae long, extending almost the entire width of 

 the segment; the infraspiracular setae forming a broad tri- 

 angular patch, broadest on its cephalic margin and extending 

 almost across the segment, the adjacent margins of the su- 

 praspiracular and the infraspiracular setae of the seventh ab- 

 dominal segment coalesced; the anterior and the posterior 

 sternal setae of the prothorax distinctly separated, those of the 

 mesothorax coalesced on the median line, those of the meta- 

 thorax broad and coalesced throughout their entire extent; the 

 sternal setae of the first six abdominal segments broad and 

 coalesced with the pedal setae, the sternal setae of the seventh 

 abdominal segment minute in comparison with those of the other 

 segments and separated from the pedal setae [pl.30, fig.2]. 



Pupa. White; the legs, antennae and wing pads not closely 

 applied to the body; the third segment of the antennae subequal 

 in length to the second; the pronotum not with a well marked 

 median, impressed line and not with a tubercle on either side in 

 front; the first ventral abdominal segment not quite as long as 

 the next three. Length, 10mm; width, 5mm. 



Cocoon. Dark brownish, oval in outline, attached to the side 

 of the small roots of Sparganium androcladium 

 and much wider than the roots to which they are attached. 

 Length, 10mm ; width, 6inm. 



Described from numerous specimens collected by Dr J. G. 

 Needham at Saranac Inn N. Y. on the bases of the roots of 

 Sparganium androcladium [pi. 23]. 



HAEMONIA 



This genus contains a single American species, H a e m o n i a 

 n i g r i c r n i s , which occurs rarely throughout the United 

 States and Canada. The adult is quite similar in general ap- 

 pearance to the species of Donacia. It can be readily recognized 

 by having the tarsus narrow, glabrous, and its apical segment 

 very long, and the inner and the outer margins of the elytra at 

 apex usually produced into well marked teeth. 



