16 GEO. H. HORN, M. D. 



slightly converging, disc convex, moderately densely punctate, hind angles not 

 carinate ; elytra striate, intervals slightly convex, rather densely rugosely punc- 

 tate ; body beneath coarsely, but not densely punctate ; abdomen more finely and 

 closely ; legs ferruginous, brown. Length .12 - .18 inch ; 3 - 4.5 mm. 



The males are usually smaller and more slender than the females 

 and the form is so obviously different that it is not remarkable that 

 Say described them as distinct. 



In distribution the sjDecies is widely diffused, occurrmg from the 

 N. E. States to Texas. 



I have examined the type of D. ereptus Bon v. in the cabinet of 

 my friend Salle, and find that it is merely an avKsnicornis with the 

 branch broken from the fifth joint of the antennae. May not Euc- 

 nemis monilicornis Mann, be the female of amcenicornw ? 



Closely related to ammnicornis is foveolatus Guer. from Mexico. 

 Bonvouloir appears to have seen but one 9 in which there were two 

 transverse foveae on the disc of the thorax. These seem not to be 

 always present and therefore of no value in separating the two species. 

 I find, however, that the marginal sulcus is quite well marked in 

 the 9 and will serve to distinguish both sexes from amcenicornis. 



D. riifipeN Mels. — Form oblong, rather slender % , stouter 9 , brown or pi- 

 ceous, slightly shiuing, sparsely clothed with cinereous pubescence ; antennae 

 paler brown, two-thirds the length of the body and slender % , less than half the 

 length of body and stouter 9 > joint second shorter, but equal to the fourth, third 

 nearly as long as the next two, joints 5-10 slender, gradually longer, the elev- 

 enth one and a half times as long as the tenth ; in the female joints 4-10 are 

 nearly equal in length, very little longer than wide, the eleventh nearly as long 

 as the two preceding ; head convex, coarsely and deeply punctate, front rather 

 deeply depressed above the base of the clypeus, the fi-ontal carina broadly inter- 

 rupted at middle ; clypeus very coarsely punctate, very narrow at base, less than 

 half the distance to the eyes ; thorax slightly broader than long, narrower in 

 front, but less so in the female, sides posteriorly straight, in front arcuate, hind 

 angles very little prolonged, not carinate ; disc convex, moderately coarsely and 

 closely punctate, a very slight median line 9 not evident in the % ; elytra grad- 

 ually narrower at apical third, the disc vaguely substriate near the base, surface 

 more finely and sparsely punctate than the thorax ; body beneath coarsely and 

 closely punctate ; legs rufo-ferruginous. Length .14 % - .22 9 inch ; 3.5 - 5.5 mm. 



Since my attention has been called to this species by the studies 

 preliminary to the present essay, it has given me nearly as much 

 trouble as my notes concerning it ajDpear to have caused Bonvouloir. 



In comparing this species with amoenicornis two very striking dif- 

 ferences have been observed ; first, in the form of the antennae and 

 second in the antennal grooves. The unusual length of the antennse 

 % has, however, a parallel in falla.r, a Brazilian species, and may 



