102 Journal New York Entomological Society. [Voi. viii. 



Pteryngium Reitt. 

 Among the close allies of Cryptophagiis, the two species of this 

 genus may be instantly recognized by the rather narrow, strongly de- 

 pressed and planulate body, with parallel sides, finely, densely punc- 

 tured surface, short pubescence and entire subsutural lines. In this 

 last feature, as well as the evenly arcuate and minutely, evenly serru- 

 late sides of the prothorax, they resemble Henoticus, but differ in the 

 depressed body and in the very minute basal fove;^ of the pronotum, 

 connected by a very fine and feeble basal groove, which is finely inter- 

 rupted at the middle. In the structure of the legs, prosternum, 

 trophi and antennce they perfectly resemble Cryptopluii^us, but differ 

 from that genus, as well as Henoticus, in the somewhat shorter and 

 thicker tarsi, and especially in the much more elongate basal segment 

 of the abdomen, this being as long as the next three combined ; the 

 sutures are free and perfectly straight throughout, as usual in the tribe. 

 The frontal margin above the antennce is very obsoletely and indis- 

 tinctly margined. The species may be thus characterized : — 



Body parallel, depressed, rather feebly shining, pale rufo-ferruginous throughout, the 

 pubescence short, even, subdecumbent and rather abundant ; eyes moderate in 

 size and prominence, not very coarsely faceted, the antennas scarcely as long as 

 the head and prothorax, notably stout, the club parallel and broad, its first two 

 joints equal and very strongly transverse, joints one to three rapidly decreasing 

 in size ; prothorax about one-half wider than long, the sides parallel, evenly, 

 distinctly arcuate from base to apex and minutely, evenly serrulate, the apex 

 broadly arcuate, the punctures fine but deep and very close-set ; elytra but little 

 more than one-half longer tlian wide, about equal in width to the prothorax and 

 two and one-half times as long, parallel, obtusely rounded behind, finely but 

 deeply, very closely punctate. Length i.S mm.; width 0.72 mm. Lake Superior 

 and Europe crenatum Gyll. 



Body similar in general form and coloration Ijut smaller, narrower and more shining, 

 the antenna; distinctly less stout, with the club less robust ; prothorax similar in 

 form but a little more transverse, finely, strongly punctured but only moderately 

 closely, the surface more shining ; elytra similar in general form but more elon- 

 gate, scarcely wider than the prothorax but almost three times as long, the punc- 

 tures fine, strong and rather close-set but much less dense than in crenatum, and, 

 as in that species, having the surface broadly, transversely impressed at some 

 distance behind the base, but here the impression bears traces of longitudinal 

 striiform lines, which are wanting in crenatum ; the pubescence, also, is still 

 shorter, sparser and less evident throughout. Length 1. 65 mm.; width 0.6 mm. 

 Queen Charlotte Islands (Massett) — Mr. Keen malacum, sp. nov. 



These two species are each represented before me by a single ex- 

 ample in which the hind tarsi are 4-jointed. It is presumable, of 



