g NATURAL HISTORY BULLETIN 



about the base to the apex. Elytra broadest a little in front of the middle, 

 the length of each a little more than twice the breadth. Entire upper 

 surface with a fine alutaceous sculpture, visible only under high magnifica- 

 tion. Under side better preserved than the upper and much more roughly 

 sculptured, the punctuation being strongly pronounced and coarse, the 

 punctures circular and separated generally by much less than their own 

 diameters. In front of the middle coxae, these punctures are compara- 

 tively fine but behind them, on the sternal pieces and especially on the 

 coxal plates they are large, taking into account the size of the insect. The 

 abdomen is about equally coarsely but somewhat less strongly punctured, 

 toward the base, but much more finely on the last two segments. Legs 

 rather slender, the anterior and middle tarsi somewhat dilated. Length, 

 3.75 mm. Width across both elytra at broadest point, 2.40 mm. 



Station number 14. One beautiful paired specimen, collected by Geo. 

 N. Rohwer. The type is in the American Museum of Natural History. 



I refer this insect to Ccelamhus without the least hesitation, the 

 shape, sculpture, and structural features all point to the same 

 conclusion. It seems to have had more likeness to C. medialis 

 than to any other of our recent North American species, but was 

 more finely punctured above. 

 • 



Agabus Leach. 



A. CHARON n. sp. (Plate IV, Fig. 1.) Form almost regularly elliptical, 

 broadest about the middle of the body length. Head large, and, as pre- 

 served, longer than the prothorax when viewed from beneath, about equal to 

 it when seen from above, no distinct sculpture aside from a fine alutaceous 

 roughening which also covers the upper surfaces of the prothorax and 

 elytra. Prothorax short, about three times as broad as long in dorsal view, 

 sides nearly straight or slightly arcuate, convergent from base to apex. 

 Elytra at base not quite continuing the prothoracic outline, conjointly near- 

 ly one and one-fourth times as long as broa<l, without striation or evidence 

 of coarse punctures. Legs rather short. Length from front of head to 

 elytral apex, 8.25 mm. ; of elytra, 6.00 mm. Width across both elytra at 

 widest point, about 4.75 mm. 



Station number 14. One paired specimen, collected by Mrs. W. P. Cock- 

 erell or S. A. Rohwer. The type is in the Museum of the University of 

 Colorado. 



This insect probably belongs with Agabus, judging from the 

 form, size, short legs, and such of the ventral sclerites as can be 

 made out. It is, of course, possible that it should form a separate 

 genus, but no characters are apparent upon which to base a di- 

 vision. It is readily distinguished from the fossil A. florissan- 



