STAPHYLINID^E. 49 



The two species hen- recorded from Colorado differ considerably from 

 each other in general appearance, but appear to be structurally similar. 

 They differ from modern species, one more markedly than the other, in the 

 great brevity of the antenna? and of their separate joints, as well as, so far 

 as can be seen, in the shortness and stoutness of the leg's. 



S OHAMBERLINI. 



PI. V. fig*. 10, 11. 

 'ni* ,/,, inil>, -rlini Scudd.. Tort. Ins. N. A:. 50S, pi. Id, tig. s (IS'.tO). 



Florissant, Colorado. 



QuEDirs UREWERI. 



PI. VI, tigs. 1, -l. 



(Jiirdhi* lift-in- ri Scudd.. Tort. Ins. N. A.. 5(l8-5()!t, pi. Ki, tig. 4(1890). 

 Florissant, ( 'olorado. 



LAASBIUM gen. nov. (\da<:, fi t 6co). 



This name is proposed for a couple of fossil insects bearing a very close 

 resemblance to Lathrobiuin, both in general appearance and in many details 

 of structure, but which can not be placed there or even in the tribe 

 Ptederini, to which Lathrobium belongs, on account of the entire absence 

 of any constricted neck, the head being 1 altogether sessile upon and indeed 

 partially embraced by the thorax. The body is long and slender. The 

 head is more or less triangular, largest at base; the antennae long, slender, 

 filiform, all the joints twice or more than twice as long as broad, the first 

 longer but not much larger, the last shorter and smaller than the rest. 

 Thorax transverse, equal, with rounded angles. Elytra twice or more than 

 twice as long as the thorax, and together broader than it. Legs rather short 

 and slight, but with dilated femora, the fore tarsi apparently not expanded. 

 Abdomen beyond the elytra as long as the rest of the body with parallel 

 sides and a bluntly rounded tip. 



LAASMUM AGASSIZII sp. nov. 

 PI. VI. tig. 4. 



Head of about equal length and breadth, regularly tapering from the 

 base, the outer angles rounded, the surface perfectly smooth. Antennae 



MON XL - -4 



