318 Journal New York Entomological Society. lYoi. xxvu. 



posterior femora, which latter is always uniformly metallic, at least 

 in all the numerous specimens which I have examined, the prothorax 

 is slightly longer, with distinct anterior tubercles and the head behind 

 the eyes is more deeply constricted with a narrower neck. 



I have seen specimens of what I consider to be dives Lee. from 

 New Foundland, Maine, Connecticut, New York and New Jersey. 



The western specimens from Cal., Oreg., etc., which are probably 

 pyritosa Lee. do not seem to differ very much from typical pusilla. 



Donacia pusilla var. robusta new var. 



Female. — More robust and much larger than typical pusilla; antennae 

 annulate, similarly formed ; prothorax wider and less distinctly narrowed to 

 apex and rather more coarsely rugose ; elytral indentations less pronounced ; 

 legs reddish, posterior femora with a small tooth. Length 7 mm., width 

 3.2 mm. 



Como, S. Wyoming. 



Paratype in coll. C. W. Leng. 



This form looks very distinct from typical pusilla but I am unable 

 at present to find a strong enough character to give it specific 

 standing. 



Donacia femoralis Kirby. 



This species was described from Nova Scotia but Mr. Leng in his 

 revision gives only Washington and Vane. Isld. 



I haven't seen anything from the East which fit Kirby's descrip- 

 tion except metallica and it is possible that the two are the same. 

 Specimens from California, Washington, Br. Colombia, etc., standing 

 under that name are possibly germari placed with flavipennis as syn- 

 onym of femoralis. The descriptions of germari and flavipennis are 

 so poor that it is impossible to identify them and I have seen no spec- 

 imens from Alaska, the type locality for both. 



Donacia serricauda new species. 



Female. — Cupreous, form nearly as in flavipes, antennae black, reddish at 

 base ; legs reddish, femora with a more or less distinct metallic cloud. Head 

 densely punctate and sparsely pubescent ; median line deep ; frontal tubercles 

 absent ; ocular orbits absent ; antennae extending back to about basal fourth, 

 second joint shorter than third, the latter about as long as the basal joint, 

 fourth joint a little longer than third, outer joints scarcely wider than the 

 preceding. Prothorax as wide as long; narrowing towards base; anterior 



