THE CANADIAN ENTOMOLOGIST. 187 



circle formed of pale, or cinereous hairs, common to both. The circle is 

 probably more distinct in recent specimens. [Taken at Grimsby, Ont, 

 by Mr. Pettit, and at Toronto by Mr. Couper ; north shore of Lake 

 Superior by Agassiz's Expedition.] 



[118.] 16S. Byrrhus varius Fabr. — Length of body 2^ lines. 

 Several specimens taken in the journey from New York to Cumberland- 

 House. 



Body underneath black. Head and prothorax bronzed, the gloss 

 obscured by glittering hairs, above the scutellum is a patch of golden 

 ones : scutellum channelled, covered with paler hairs : elytra slightly 

 furrowed, bronzed, with the alternate interstices of the discoidal furrows 

 green-bronzed, spotted with little velvetty patches of black hairs. [Be- 

 longs to Cytilus ; not uncommon throughout Canada.] 



[H9.] FAMILY HYDROPHILID.E. 



169. Hydrobius fuscipes Linn. — Length of body 3 lines. A 

 single specimen taken in Lat. 65 . 



Body oblong, convex and rather vaulted ; underneath black, very 

 minutely and thickly punctured with a pale short decumbent hair planted 

 in each puncture ; above slightly bronzed, more conspicuously punctured, 

 naked and rather glossy. Head slightly impressed on each side between 

 the eyes ; palpi pale rufous, last joint dusky at the tip : antennae rufous 

 with a black knob : sides of the prothorax with two or three groups of 

 larger punctures : elytra furrowed with thickly punctured furrows, dusky 

 rufous at the sides : legs dark rufous, base of the thighs black. This is 

 smaller than my British specimens, the furrows of the elytra are rather 

 deep, and their sides more conspicuously rufous. [Taken in Canada.] 



[120.] 170. Hydrobius marginellus Fabr. — Length of body i 2 /z 

 line. Two specimens taken in Lat 54 . 



Body subelliptical, convex, minutely punctured, black ; above glossy. 

 Palpi and antennae dusky rufous ; knob of the latter black : sides of the 

 prothorax, and the anterior margin dusky rufous : elytra with a single 

 furrow adjoining the suture ; sides dusky rufous : tarsi rufous. 



171. Hydrobius melanocephalus Oliv. — Length of body 2% — 2)^ 

 lines. Two specimens taken in Lat. 54 



[121.] Body subelliptical, minutely punctured; underneath black, 

 somewhat hairy with very short inconspicuous hairs, above lurid or dirty 

 yellow, glossy, more conspicuously punctured. Head black with a qua- 

 drangular yellow spot before each eye ; nose gibbous separated from the 



