STAPHYLINID.E. 61 



Leptacinus leidyi sp. nov. 

 PL VII, fig. U. 

 Head half as long again as broad, tumid, with convex sides, rajjidly 

 tapering behind to a distinct neck, a little more than half as wide as the 

 head; surface coarsely and somewhat sparsely punctate. Antennae reaching 

 back scarcely beyond the front edge of the prothorax, scarcely enlarging 

 apically, the joints beyond the basal one subquadrate, the second to the 

 sixth inclusive slightly longer than broad, those beyond slightly broader 

 than long, the last siibglobose. Thorax about as long as and a little broader 

 than the head, the sides apparently parallel, the surface with mingled fine 

 and coarse punctuation and finely pilose. The legs proportionally much 

 shorter than in modern Leptacini, but otherwise similarly constructed, and 

 the front tarsi dilated as much as in L. nigripennis LeC. Elytra a little 

 longer than the thorax, probably not much broader, squarely truncate at 

 apex, but with both outer angles well rounded, the whole punctate and 

 pilose like the thorax. The abdomen is seen laterally but appears to be 

 much slenderer than the elytra, with tolerably parallel sides, expanding 

 slightly to the fifth segment and then rapidly narrowing to a bluntly 

 rounded apex, the whole surface punctate and delicately pilose like the 

 other parts. The whole body and its appendages piceous throughout. 



It is a much stouter form than L. madurei, and its punctate body 

 separates it distinctly from that. 



Length, 5.5 mm.; breadth, 1 mm.; length of hind legs, 2.5 nmi. 

 Florissant, Colorado; one specimen. No. 13615. 



Named in memory of the distinguished zoologist and paleontologist, 

 Joseph Leidy. 



Leptacinus f exsucidus sp. nov. 

 PI. VII, fig. 13. 

 The species here considered can hardly be congeneric with the modern 

 forms of this genus, nor with the other species from Florissant which are 

 here described as Leptacini. There appears to be absolutely no neck, and 

 the thorax is crowded closely both upon the head at one end and the elytra 

 at the other — and the straight equal and parallel sides of the body appear to 

 show that this is not a mere accident of preservation — so as to make it very 

 slightly resemble one of the tribe of Xantholiui, to which otherwise it would 



