22 Mr. C. J. Gahan on Longicorn Coleoptera 



By the long - , strongly curved, ant] acutely pointed man- 

 dibles this species may be distinguished from any other in 

 the whole group. Whether this character and one or 

 1\vo others of minor importance are in themselves sufficient 

 to raise the species to the rank of a genus I am at present 

 unable to decide. Though the mandibles are much longer 

 tlum in the typical species of Imbn'us, they seem to be of 

 much the same form. The head is more elongate and more 

 gradually narrowed behind the eyes than in Imbrius lineatus] 

 but this difference is not so evident in the female, in which 

 also the mandibles are much less developed. The prosternal 

 process is feebly tubercled behind. The first joint of the 

 posterior tarsus is almost equal in length to the two following 

 joints combined. 



The genus Imbrius ought, I think, to be retained, though 

 it would be hard to give characters of importance separating 

 it from Dytnasius. The most essential difference lies in the 

 truncate and spinose apices of the elytra in the latter. The 

 antenna? of the male in both genera are much longer than 

 those of the female. In I. ephebus, Pasc. {$), the antenna? 

 are half as long again as the body ; and in E. /rneatus, Pasc. 

 (c?)> they are almost twice as long as the body. 



DYMASIUS, Thorns. 



Lacordaire's characterization of this genus is inaccurate. 

 Though he has described the male as well as the female, he 

 probably had only specimens of the latter sex before him. 



]n the male the antenna? are about twice as long as the 

 body, with the eleventh joint much longer than the tenth, 

 with the third and fifth joints subequal, each longer than the 

 fourth. (Lacordaire says "3 egal a 4-5 rc'unis; " but this is 

 not tiue even of the female, in which the third joint is dis- 

 tinctly longer than the fifth, but is certainly not equal to the 

 fourth and filth united.) The first joint of the posterior tarsus 

 is not quite as long as the two succeeding joints combined. 



in referring to the elytra Lacordaire says these organs 

 present no trace of punctuation. In the five or six specimens 

 that 1 have seen the longitudinal subglabrous lines of the 

 elytra exhibit a line punctuation made up of close unequal- 

 sized punctures. 



Ceramby.v macilentus } Pasc. (Pachydissus in Cat. Gem. et 

 Har.), must be referred to this genus. The male type of this 

 species differs from males of D. strigosus, Thorns., only in 

 that the third and fifth joints of the antennae are relatively 

 shorter and the. external apical spines of the elytra are directed 



