452 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



Described from one specimen. 



Type No. 2,526 M. C. Z. Florissant, Col. (No. 7,646 S. K 

 Scudder Coll.). 



Probably not a true Oligomerus since the head is larger and the 

 prothorax shorter and higher than in the modern species. For the 

 present, I prefer to leave it here rather than erect a new genus for its 

 reception. 



ANOBIUM DURESCENS Scudder. 



I have referred to this species a specimen, No. 2,527 M. C. Z. (No. 

 12,026 S. H. Scudder Coll.). It differs from the type in being 1 mm. 

 longer, (length 4.50 mm., as compared with 3.50 mm. in the original), 

 but I can find no other tangible difference. 



BOSTRICHIDAE. 



AMPHICERUS SUBLAEVIS, sp. nov. 



Plate 6, fig. 4. 



Form stout. Head large. Prothorax, in side view, subcuneiform, 

 the back not much arched, surface comparatively smooth and without 

 defined asperities. Elytron a little more than twice the prothoracic 

 length, faintly substriate, otherwise nearly smooth, without teeth on 

 the declivity. The only leg showing is one of the hind pair, which is 

 very small and relatively weak. Length, from front of pronotum to 

 apex of elytra, 5.85 mm. 



Described from one specimen. 



Type. No. 2,524 M. C. Z. Florissant, Col. (No. 14,250 S. H. 

 Scudder Coll.). 



This is a little larger than Xylobiops lacustre and is much smoother. 

 The fossil Dinoderus cuneicollis is much smaller. I have placed it in 

 Amphicerus in spite of the lack of prothoracic armature because of 

 the general likeness to the New Mexican A. brevicollis, which, judging 

 from material received from Prof. D. E. Merrill, is the female of A. 

 grandicollis. 



XYLOBIOPS LACUSTRE Wickham. 

 One specimen, No. 2,525 M. C. Z. (No. 14,247 S. H. Scudder Coll.). 



