Dec, 1919.] Shaeffer: Notes on Chrysomelid.-e. 315 



whose name I have given it in recognition of many favors received. 

 It resembles megacornis more than any other of our species but differs 

 from that by more depressed form, less stouter antennal joints, poste- 

 rior femora moderately clavate with a small acute tooth in both sexes 

 and mesosternal process a little narrower. 



The males look much like very small females of subtilis, but have 

 shorter antennae, a little more convex and shorter form, reddish legs, 

 narrower and more elongate prothorax and more prominent eyes. If 

 compared with the males of that species the differences are obvious 

 enough. 



Donacia tuberculifrons new specie9. 



Female. — Oblong-oval, shining, aeneous, feebly depressed. Head densely 

 punctate, punctures smaller than those on prothorax ; median line deeply im- 

 pressed ; frontal tubercles very distinct ; antennae black ; scarcely reaching to 

 the middle of elytra, second and third joints small, the latter a little longer 

 than the former, fourth subequal to second and third together. Prothorax 

 about as wide as long ; anterior angles distinct, not prominent, posterior angles 

 prominent; anterior tubercles nearly obsolete; sides feebly narrowing to base 

 and scarcely undulate; median line distinct; basal impression feeble; surface 

 moderately coarsely punctate ; punctures well separated on the disk, more 

 crowded near the impression, at apex and at sides, confluent at the latter and 

 strigose. Elytra about three and one half times as long as the prothorax and 

 about twice as long as wide at base; punctures of the regular series moder- 

 ately large; intervals rather feebly transversely rugose on the disk; apices 

 truncate ; last dorsal broadly rounded. Body beneath densely and finely punc- 

 tate and clothed with very short white pubescence, which does not obscure the 

 aeneous surface color. Legs aeneous, posterior femora moderately clavate and 

 armed with a small tooth. Mesosternal process narrow, a little longer than 

 wide. Length S mm., width, across base of elytra, 3 mm. 



Male. — Slightly narrower, tooth of posterior femora a little longer, last 

 dorsal segment feebly emarginate-truncate. 



Toronto, Canada, (type) Northern Illinois. 



The Toronto specimens I owe to the kindness of Mr. Chas. Liebeck. 



This species is of more robust form than either subtilis or distiucta 

 with different prothorax and shorter antennae. It has the antennae 

 similar to liebccki above described but the head in the latter is strongly 

 constricted behind the eyes, which are much more prominent than in 

 tuberculifrons, which has the prothorax more convex and shining and 

 the intervals of the elytra are feebly rugose on the disk, the posterior 



