AQUATIC INSECTS IX NEW YORK STATE 325 



as the next four; the elytra usually \Yitli the outer angle strongly 

 and the inner angle slightly prolonged at apex; the tarsal seg- 

 ments of a uniform width. Length, 7mm; width, 4mm. 



Cocoon. Light brownish, oval in outline, and attached to the 

 side of the small roots of an aquatic plant^; the cocoons broader 

 than the roots. Length, (hum; width, omm. 



Described from specimens collected at Ithaca X. Y. by the 

 writer and by Messrs Hubbard and Schwarz along the Detroit 

 and St Clair rivers, Detroit ^lich. 



Subfamily galerucin ae 



This subfamily includes several genera and species, a single one 

 of which is found on the leaves of X y m p h a e a a d v e n a . 

 The larvae feed on the epidermis of the leaves, and where this 

 plant occurs they are quite abundant. 



Galerucella nympliaeae 



Egg". Oblong or short cylindric with smoothly, obtusely 

 rounded ends; yellow, shining. The egg cluster consists of a 

 small number (6 to 20) eggs placed closely side by side on end 

 on the upper surface of a lioating leaf of Nymphaea or Brasenia. 



Larva. Head black; the antennae mere tubercles, three 

 jointed; the labrum three sided, the distal and lateral margins 

 in the form of a continuous convex curve constituting one side, 

 the remaining sides formed by the proximal end of the labrum 

 with an angle on the median line, the distal nmrgin with a row 

 of comb-like bristles attached to the ental surface, two long 

 discal and two long lateral setae, the two groups forming a 

 transverse line, and four marginal setae [pi. 27, fig.9] ; the man- 

 dibles tridentate, the two inner teeth subequal, the outer one 

 much shorter [pl.27, lig.8] ; the thorax and abdomen black above 

 except at the sutures and with fine whitish fuscous lines divid- 

 ing the black into distinct areas — there is such a line on the 

 meson of the notum of the three thoracic segments, and a line 

 on each abdominal segment dividing it into two parallel trans- 

 verse bands, the posterior being the longer, at the end of each 

 of these bands a quadrangular spot, and laterad of each an- 

 terior spot another subequal in size which bears the spiracle, 

 and laterad of the spiracle a much larger spot as long as the 



iTbe European species are found on the roots of Potamogetou 

 n a t a n s, and LeConte and Horn record the American species froui 

 Potamogeton; but by an oversiglit I neglected to record the name of the 

 plant on which I found them. 



