353 



Specimens nine. Extremely like C. coUaris, Gyllenhall, and may prove 

 to be a variety of that European species, from which it differs, principally, 

 iii being much darker beneath, paler above, and of rather larger size. 



C. *hinotalus. Beneath blackish, ventral segments piceous at tip; head 

 and thorax ochreous. the former with two triangular spots between the eyes, 

 the latter with two central subquadrate spots black: each elytron with four 

 sei'ies of punctures, a pale suture and margin, the disc iiTorate with black 

 dots and tortuous lines; three longitudinal series of spots, and a broad fascia 

 behind the middle, obsolete, black. 



Length nine twentieths of an inch. 



Specimens three. It Is possible that this may be the irroraius of Fab- 

 ricius. 



C. *tceniolatus. Ferruginous ; head at base and a vertical spot black ; tho- 

 rax greenish black at base and tip, the black portions dilated and confluent in 

 the middle; elytra greenish black, each with about eight irregular series of 

 deep punctures; external margin, Interrupted basal fascia, and three narrow 

 lines pale testaceous: all beneath ferruginous. Length thirteen fortieths, 

 breadth between six and seven fortieths of an inch. 



Sufficiently distinct from C. venustus, Say, and Dytiscus interrogatus of 

 Fabrlcius. Specimens six. 



C. *discolor. Black, minutely and obsoletely granulated. Head with 

 two basal piceous spots; elytra fuscous, margin and base pale, epipleura 

 yellowish; three series of setiferous punctures, which are obsolete behind, 

 on each elytron: ventral segments at tip and feet piceous: nails alike in 

 both sexes. 



Length over three tenths of an inch. 



Specimens five. Appears to differ from all of the species described by 

 Mr. Say. 



C.*acuductus. Oblong oval, black, minutely acuducted; head before, 

 two vertical spots, lateral margins of the thorax, and humerus piceous; 

 pectus and feet ferruginous. 



Length over five twentieths of an inch- 

 One Individual In the collection of Mr. Oakes. Easily recognised by the 

 numerous short scratches or acuducted impressions. 



GENUS HYDROPORUS. 



H. *fasciaius. Ferruginous, body minutely punctured above, with de- 

 pressed hairs : antennte blackish at tip ; head with a dilated oblique inden- 

 tation each side in front of the eyes, and a vertical blackish spot; thorax 

 black at tip and base ; elytra black, an abbreviated sometimes interrupted 

 fascia near the base, another trimacular behind the middle, and an apical 



OCCAS. PAPERS B. S. N. H, — I. 23 



