AQUATIC INSECTS IX NEW YORK STATE 325 



as the next four; the elvtra usually with the outer angle strongly 

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

 ments of a uniform width. Length, 7nim; 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, 8mm. 



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

 writer and by Messrs Hubbard and Schwarz along the Detroit 

 and St Clair rivers, Detroit Mich. 



Subfamily galerxjciisae 



This subfamily includes several genera and species, a single one 

 of which is found on the leaves ofNymphaea advena. 

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

 plant occurs they are quite abundant. 



Galerucella nymphaeae 



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 floating 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 margin 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 [pl.27, flg.9] ; the man- 

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

 much shorter [pl.27, fig.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 



iThe European species are found on the roots of Po tarn oge ton 

 u a t a n s. and LeCoute and Horn record the American species from 

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

 plant on which I found them. 



