318 NEW YORK STATE MUSEUM 



sternal setae of the first three abdominal segments broad and 

 not divided longitudinall}', those of the fourth abdominal seg- 

 ment narrow and hardly continuous at middle, those of the 

 fifth, sixth and seventh abdominal segments divided longitudi- 

 nally; the pedal setae of the first three abdominal segments 

 almost as long as the width of the segment, those of the last 

 four segments smaller and circular in outline [pl.29, fig.l]. 



Pupa. Whitish; legs, wing-pads and antennae not closely at- 

 tached to the body; the second and third segments of the 

 antennae subequal; the pronotum with a distinct median fur- 

 row and without lateral tubercles; the first ventral abdominal 

 segment as long as the next five. Length, 11mm; width, 4mm, 



Cocoon. Black; oval in outline, rotund, concave on the ven- 

 tral surface; and attached in groups to the apices of the large 

 lateral stems of N y m p h a e a a d v e n a . Length, 13mm; 

 width, 7mm. 



Described from specimens loaned by the Museum of Compara- 

 tive Zoology and collected by George Dimmock at Canobie Lake, 

 N. H., July,' 1887. 



Donacia palmata 



Egg. 1mm long, opaque white, both ends bluntly rounded, 

 the sides parallel; laid in a double row, 40 or 50 eggs in a mass, 

 the mass completely surrounded by a thick, gelatinous covering, 

 on the under surface of the leaves of N y m p h a e a a d v e n a 

 and of Castalia odorata [pl.21, figs. 1 and 4; pi. 24, 

 fig.4]. 



Larva. IMandibles apically bidenliculate, the inner margins 

 with poorly marked crenulations [pl.2,3, fig.ll] ; ej-es present, 

 four in number, three in the anterior row [pl.25, fig.lO] ; the seg- 

 ments of the legs with few setae, four or five setae to a segment 

 [pl.25, fig.l2] ; the labrum four sided, with eight long marginal 

 setae, the six outer setae much the longer and equidistant from 

 each other, the median pair about half the length of the others, 

 with six discal setae, the distal and median pairs near the 

 middle of the labrum and proximad of the sensory pits, the 

 distal pair not more than half the size of the median pair, the 

 proximal pair distinctly longer than the median pair, the me 

 dian pair more distant from each other than either the dis- 

 tal or proximal pairs, the two lateral setae long and slen- 

 der, and with four sensory pits [pl.25, fig.9] ; the anterior 

 tergal setae of the mesothorax and metathorax and first three 

 abdominal segments divided into three groups, those of the tho- 

 racic and first two abdominal segments widely separated, those 

 of the other segments not so well marked, the anterior tergal 

 setae of the first five abdominal segments attenuated laterally 



