Sept., I9I7-] Fall: New Dytiscid^. 169 



Bidessus suburbanus new species. 



Ovate, polished, very finely and feebly pubescent, ochreous, elytra clouded 

 with fuscous at base, narrowly so along the elytral suture, and with some 

 more or less evident transverse discal clouds behind the middle ; metaster- 

 num and abdomen — especially toward the base — brownish ochreous. Head 

 and prothorax minutely sparsely punctate, the elytra a little more strongly so, 

 the punctures separated from two to- three times their own diameters ; basal 

 thoracic and elytral striae as in granarius. Body beneath with a few minute 

 scattered punctures. Otherwise nearly as in granarius. Dimensions of type: 

 length 1.85 mm.; width .95 mm. 



There is but slight variation in the series at hand. Fifteen ex- 

 amples are before me, all btit one (including the type) from Staten 

 Island, New York. One specimen is labeled " Penn." 



Concerning the species, Mr. Sherman writes : " I have seen it only 

 from Staten Island (taken in a pond in the woods no longer existing) 

 and from Carbon Co., Pa., and from ' Pa.' " 



Although closely related to granarius, it is abtindantly distinct by 

 its less broadly ovate form, less pointed behind, and finer sparser 

 punctuation both above and beneath. The blackish shade at the base 

 of the elytra is nearly wanting in granarius. There are no obvious 

 sexual differences. 



CCELAMBUS. 



Ccelambus sylvanus new species. 



Form rather narrowly ovate, widest before the middle, moderately convex, 

 glabrous, both sexes shining; color castaneous, the antennae, legs and under 

 surface of head and prothorax brighter rufous. Head and prothorax finely, 

 sparsely punctulate, the latter more strongly and closely so along the front 

 and rear margins. Elytra widest a little behind the base, sides continuous 

 in outline with the prothorax; punctuation not very close, consisting of inter- 

 mixed, moderately coarse and much finer punctures. Metasternum, hind 

 coxal plates, and sides of the basal ventral segments sparsely punctate, the 

 punctures gradually diminishing in size from front to rear. Front and middle 

 tarsi of male moderately dilated, a little narrower in the female ; claws small 

 and slender, unmodified in the male. Length 2.5 to 2.y mm.; width 1.35 to 

 *i.4S mm. 



New York (Peekskill — Sherman). The type is a male bearing 

 date 6 — 3 — 90. Of this species Mr. Sherman writes: "Known to me 

 only from Peekskill ; taken in a pond in the woods no longer existent." 



The present species is very nearly allied to C. laccophilinns 

 (wrongly described and recorded in the Henshaw List as a Hydro- 



