222 NORTHERN ZOOLOGY. 



DESCRIPTION. 



Body above punctured, naked. Head and its organs yellow, with the eyes, occiput, and apex of 

 the mandibles black ; a levigated transverse elevation of the front, as in the preceding species : pro- 

 thorax longer than wide, constricted at the base, with an impression in the middle, pale-yellow, disk 

 embrowned : scutellum rufous : elytra rather paler than the prothorax, with a stripe adjoining the 

 lateral margin, an angular band beyond the middle and the base, black : antepectus, anus, and legs, 

 yellow, rest of the underside of the body is black, and hoary with decumbent white hairs. 



Family DGNACIADiE. Donaciadans. 



CXIX. Genus HiEMONIA. Meg. 



(299) 1 . * H^emonia nigricornis. Black-horned Hcemonia. 



H. (nigricornis J lutea ; antennis, pectorc, abdominisque basi, nigris ,■ prothorace canaliculato, svbqv.ad.Tato, medio constricto - 



cli/tris puncto-s/riatis, apice bispi?iosis, interiori brevi. 

 Black-horned Htemonia, luteous : antennae, breast, and base of the abdomen black ; prothorax channelled, subquadrangular, 



constricted in the middle ; elytra punctured in rows, armed at the extremity with two spines, the innermost one 



short. 



Length of the body 3| lines. 



Taken in Canada by Dr. Bigsby. 



DESCRIPTION. 



This species is considerably larger than H. Equiseti and Zosterce, from which it is perfectly dis- 

 tinct. Body luteous above and glossy ; underneath it is covered with a thick coat of pale, decumbent, 

 rather silky, hairs with somewhat of a golden splendor, if these are rubbed off, the colour of the 

 breast and basal abdominal segment is black. Head hairy, dusky, with a levigated naked testaceous 

 longitudinal elevation between the eyes; antennae black, robust, very little longer than the prothorax; 

 prothorax subquadrangular with prominent anterior and posterior angles making it appear constricted 

 in the middle, it is channelled with an irregular discoidal impression on each side; a few large dusky 

 punctures are observable where the channel terminates : elytra with ten equidistant rows of large 

 punctures which converge at the apex; besides these there is an abbreviated row at the base next 

 the suture, as in many Harpalidce, &c. the apex of the elytra terminates in two teeth or spines ; 

 the inner one short and dentiform, the outer one long and spiniform : legs and anal portion of the 

 abdomen yellow, the former with all their articulations dusky at the extremity. 



The sculpture of the elytra in this species much resembles that of another aquatic genus Halip- 

 his, Lat. 



