CERAMBYCID^E 271 



Hylotrupes Serv. 



The species bajulus Linn., was probably introduced into the 

 Atlantic States from Europe and has become abundant. The 

 male sexual characters are very remarkable, reversing some of 

 the ordinary tendencies in that sex observable elsewhere; for 

 example, the prothorax is much more transverse and more swollen 

 at the sides in the female than in the male and is very finely, closely 

 sculptured, while in the male it is coarsely and sparsely punctate. It 

 varies in size to an extraordinary degree and it is difficult to believe 

 that some of the minute forms, such as that published by Bland 

 (Proc. Ent. Soc. Phila., 1862, p. 8) under the name Callidium? 

 alb of as datum, having a length of only 6 mm., and of notably 

 slender outline, may not prove to be a distinct species; the de- 

 scribed antennal structure shows that it can belong to no other 

 genus than Hylotrupes. I have a European male of bajulus 

 before me that measures only 8.2 mm. 



Anocomis n. gen. 



The unusual and very distinctive antennal structure of Hylo- 

 trupes bajulus Linn., shows that the Callidium ligneum of Fabri- 

 cius, cannot be generically associated w r ith it, especially as its entire 

 habitus is different. Ligneum has always been a puzzle to taxon- 

 omists, not only as to its systematic position but in regard to the 

 diversity of form and coloration that it exhibits. Haldeman 

 listed it under Callidium, but LeConte in 1852 transferred it to 

 Physocnemum Hald.; subsequently it was assigned to Semanotus 

 and then to Hylotrupes, but, as a matter of fact, it should be con- 

 sidered a distinct generic type and the above name is here pro- 

 posed. 



The various forms, which have all been included under ligneum, 

 have never been carefully studied in series and are generally 

 misunderstood. The coloration appears to be not very variable, 

 but on the contrary is often quasi-structural in nature. For example 

 in all the normally colored examples before me, the punctures on 

 the pale parts of the elytra are very coarse and sparse, but within 

 the limits of the two rounded dark spots and on the posterior black 

 portion of the elytra they become much less coarse and decidedly 

 more close-set, thus indicating that the dark coloration does not 



