50 Trans. Acad. Sci. of St. Louis. 



it is a small species about 7 mm. in length and occurs in 

 Arizona. I have never seen it. 



Lissobiops n. gen. 



The very fine and rather rare species named Cryptobium 

 serpentinum by LeConte, is distinguished from any known 

 form of Hesperobium by four characters of greater or less 

 importance, which together appear to demand generic sepa- 

 ration. The most important of these characters is probably 

 the medially interrupted side-margins of the pronotum, the 

 latter being bounded laterally by a continuous fine reflexed 

 bead in Hesperobium. The second is the imperfect pleural 

 fold of the elytra, which comes far from attaining the infra- 

 humeral part of the inflexed sides; the third involves the 

 narrow neck, which however is probably of less significance 

 in this case than would seem apparent and the fourth con- 

 cerns the general scheme of coloration, which is unique 

 among our Cryptobia, and, bearing in mind the extreme con- 

 stancy of the color scheme in some other parts of the Pae- 

 derini, such as Paederus for example, this character, which 

 so affects the general habitus of the species, is probably of 

 considerable importance from a generic viewpoint. Lissobiops 

 resembles Hesperobium in its bidentate mandibles, but the 

 basal joint of the antennae is even longer than in any species 

 of that genus. The single species known thus far may be 

 described as follows: — 



Body slender, convex and fusiform, highly polished throughout, pale 

 testaceous in color, the anterior two-fifths of the head, the prothorax, 

 a subquadrate spot at the scutellum and the entire first, fifth and sixth 

 ventrals deep black; legs extremely slender, pale flavate; antennae 

 flavo -testaceous, joints two to six black; head narrow, elongate, sub- 

 rhomboidal, moderately narrowed before the eyes, which are moderate 

 in size and prominence, the basal joint of the antennae rather longer 

 than the next four combined and almost as long as the extreme width 

 of the head; punctures small, very feeble and extremely sparse through- 

 out; prothorax elongate, narrower than the head, rather strongly 

 narrowed anteriorly from the middle, the sides arcuate, the apex much 

 narrower than the base, the punctures feeble, very remote, with a more 

 close -set series along the broad median impunctate area; elytra not 

 quite as long as the prothorax but much wider, slightly elongate, 



