C 48 ) 
angles almost roimded : elytra yellowish w iiite, with a 
common fuliginous disk : feel yellowish- white ; tibix and 
tarsi darker. 
Length three-twentieths of an inch. 
Tliis occured extremely numerous, in October, under 
the surface of the sand in flat places on the sea beach, 
over which the high tides flow. When the water sub- 
sides their labours become visible. They proceed for- 
wards a little beneath the surface in a very irregular line, 
casting up the sand so as to resemble a miniature mole 
tunnel. 
On the wet or partially dry plain, their tunnels, though 
very small, are yet very striking to the eye, in conse- 
quence of their great abundance, and being drier and 
whiter than the general surface. They appear to be in 
search of the various minute crustaceous animals, that 
take refuge in the sand on the recession of the waters. 
4. O. emarginatus^ Black ; elytra whitish with a fuli- 
ginous suture. 
Inhab. Indiana. 
Body black, punctured : head with numerous, but not 
crouded, punctures; two longitudinal indentations be- 
tween the antennae : antennx^ mandibles and honey- 
yellow : thorax with a piceous tinge, rounded behind ; 
with rather sparse, well defined punctures, and an obvi- 
ous, impressed, dorsal line : elytra with separate punctures 
and a much dilated, common, fuliginous vitta ; sutural 
tip very obtusely rounded : honey-yellow : thighs xOid. 
coxx whitish. 
Length less than one-tenth of an inch. 
The obtusely rounded sutural tip of the elytra, gives 
this part, in repose, a profoundly emarginated appear^ 
ance. 
GENUS MOLOSOMA, Say. 
Labrum entire ; palpi filiform, terminal joint of the 
maxiliaries much longer than the second, slightly attenu- 
ated to the tip ; antennae before the eyes, inserted under 
the margin, gradually thicker at tip, four last joints lar- 
ger; body cylindric ; thorax truncate at base; abdomen 
