74 NORTHERN ZOOLOGY. 



DESCRIPTION. 



Body rather obovate and depressed ; underneath rufous clouded with dusky. Head subrufous, 

 dusky behind; antenna? and palpi yellowish, dusky at the tip: prothorax with the posterior angle 

 acuminate, subrufous, dusky in the disk, posteriorly scratched longitudinally as if by a pin : elytra 

 pale-yellow, thickly and minutely reticulated or vermiculated with black ; lateral margin yellow, 

 unspotted ; epipleura yellow ; presternum depressed. 



This species appears to represent C. H. irroratus. 



(109) 2. '* Colymbetes (Hydaticus) Mac Cullochii. Mac CullocKs C. Hydaticus. 



C. H. (Mac Cullochii) obovatus, depressus, niger, nitidus ; ore, antennis, pedibusque quatuor anterioribus, prothoracis limbo 



fasciaque, ebjtrisque fascia undulata, punctoque apicis, pallidis. 

 Mac Culloch's C. Hydaticus, obovate, depressed, black, glossy ; mouth, antennae, four anterior legs, limb and band of the 

 prothorax, and undulated apical band and dot of the elytra, all pallid. 



Length of the body 5| lines. 



Several taken in Nova Scotia by Dr. Mac Culloch. 



DESCRIPTION. 



Body obovate, depressed, glossy ; underneath black, confluently punctured and wrinkled. Head 

 posteriorly minutely punctured, black ; nose, mouth, and its organs, and a band between the eyes, 

 pale yellow ; antenna? pale with the joints above dusky at the tip : prothorax punctured, pale-yellow, 

 with a discoidal band, dilated at each extremity and surrounded by a black margin, of the same 

 colour : elytra black, sprinkled with innumerable pale-yellow dots ; near the apex is a pale, angular, 

 undulated band, and beyond it a round white spot; the margin of the elytrum is paler than the rest: 

 the three intermediate ventral segments of the abdomen have each a pair of roundish pale spots, 

 one on each side ; the four anterior legs are pale-yellow. 



XXXVII. Genus DYTISCUS. Linn. 



(110) 1. Dytiscus Ooligbukii. OoligburYs Dytiscus. 



D. ( Ooliybukii) oblongo-ovatus, oliuaceo-niger ; subtus fluvo-testaceus, suluris et segmentorum marginibus, nigris ; prothoracis 

 limbo, elytrorumque latere, flavis ; his apice punctatis foveolatisque ,• metasterni lobis acuminatis. 



Ooligbuk's Dytiscus, oblong-ovate, olive-black ; underneath yellowish-red with the sutures, and the margins of the segments, 

 black ; limb of the prothorax and side of the elytra yellow ; the latter punctured and foveolated at the apex ; 

 lobes of the metasternum acuminate. 



T >, f a i j \ Male 1 inch and 4 lines. 

 Length of the body j Female , inch and & , ines 



A pair were taken by the Esquimaux Ooligbuk in the Great Bear Lake River. 



