112 . Trans. Acad. Sci. of St. Louis. 
sixth with a small and acutely angulate incisure, much deeper than 
wide and a ninth or tenth as wide as the apex, the latter at each 
side inwardly and anteriorly oblique and rectilinearly truncate, with 
the edge beveled, becoming very thin and translucent, the surface with 
longer hairs along the margins of the notch; female unknown. Length 
4.7 mm.; width 0.82 mm. Canada (Toronto).........-lacustris n. sp. 
In the third supplement to the Henshaw catalogue it is 
stated on page 10, that No. 2514 (niger Lec.), is asynonym 
of the European qguadratus Payk. This must surely be in 
error for No. 2512 (punctulatus Lec.), as specimens of quad- 
ratus sent me by Mr. Reitter, strongly resemble the latter but 
bear no likeness at all to niger; quadratus is, however, not 
the same as punctulatus, having the male impressions of the 
venter very much deeper and differing besides in its denser 
sculpture, smaller eyes, more circularly rounded base of the 
head and other characters. In this supplement No. 2512 
(punctulatus Lec.) is said to be the same as the European 
terminatus Grav. I do not have terminatus before me at 
present, but the chances are very greatly against the accuracy 
of any such identification. 
Deratopeus n. gen. 
The species of this genus greatly resemble Tetartopeus, 
differing principally in the form of the gular sutures and 
rather shorter and stouter palpi and tarsi, small size, more 
slender form and some other structural features. They are 
few in number at present, those in my cabinet being readily 
separable by the following characters —taken in both in- 
stances from the male: — 
Body deep black throughout, the elytra testaceous in apical fifth or sixth, 
somewhat more broadly toward the sides; legs pale ferruginous, the 
antennae blackish, slightly paler at tip and notably so toward base; 
head small, longer than wide, parallel and nearly straight at the sides to 
the broadly rounded basal angles, the base arcuato -truncate; eyes mod- 
erately small; antennae rather thick but filiform, as long as the head 
and prothorax, the medial joints barely one-half longer than wide, the 
punctures strong but very sparse; prothorax distinctly elongate, much 
wider than the head, the sides very feebly converging and nearly straight, 
the punctures coarse, deep and sparse; elytra quadrate, parallel, a third 
