310 Journal New York Entomological Society. t Vo1 - xxvil. 



thorax less transverse and more or less distinctly, though finely, alu- 

 taceous and often with exceedingly fine undulating ruga? on the disk; 

 the third antennal joint is generally relatively longer than in proxima. 

 It superficially resembles cincticomis, but the color of the upper sur- 

 face seems to be generally blue or blackish blue as in proxima, and 

 the prothorax is alutaceous and somewhat dull but shining in cincti- 

 comis, the posterior femora of both sexes are as in typical proxima; 

 that is, shorter than in cincticomis. 



The var. calif omica agrees in all structural characters with 

 proxima but differs in having the upper surface entirely metallic 

 green, cupreous or seneous and the elytra more coarsely and closely 

 punctate. It seems to occur only in the West, the specimens which I 

 have seen are from Idaho, Br. Columbia and California. 



Donacia magnifica Lee. 



This with proxima is made a variety of cincticomis but is distinct 

 from either and should be given specific standing. The head and the 

 eyes are relatively smaller, the prothorax is of different form and 

 always rather coarsely punctate; the inner, smaller tooth of the 

 posterior femora of the male, distant in proxima and cincticomis, is 

 in magnifica very near and almost opposite the larger tooth and the 

 last dorsal segment of the female is shorter and rotundate-truncate 

 at apex. 



Donacia rufescens Lac. 



This is not a var. of hypoleuca Lee. but a distinct species. It is 

 always much smaller, prothorax relatively shorter and more trans- 

 verse, less distinctly alutaceous in the female, but more or less shin- 

 ing in the male. The elytra more or less shining in the male but dis- 

 tinctly alutaceous and dull in the female. The posterior femora are 

 shorter and more strongly clavate with a relatively stouter tooth and 

 the last ventral segment of the female is narrowly emarginate at 

 apex. The emargination of the last ventral segment of the females 

 of this species is unique and does not seem to occur in any of our 

 other species. It is variable, in some specimens the emargination is 

 deep, triangular in others faint. Fully colored females are blue or 

 greenish blue above. 



In hypoleuca the prothorax in both sexes is distinctly alutaceous 



