Casey — A Revision of the American Paederini. 49 



or very nearly so, parallel, finely, rather closely punctate but shining. 

 Male with the fifth ventral unmodified, feebly sinuato-truncate at tip, the 

 sixth with a triangular emargination, much wider than deep, occupying 

 three-fourths of the apex with its angle well defined and not rounded, 

 the notch gradually formed with broadly rounding sides posteriorly; 

 female having the narrow sixth ventral arcuato -truncate at tip. Length 

 8.7 mm. : width 1.5 mm. Massachusetts and New Jersey. 



cribratnm Lee. 

 Form similar but more slender, convex, polished throughout, black, the 

 elytra bright and paler rufous, with a small black scutellar spot; legs 

 pale flavate, the antennae dusky, flavous toward base and apex ; head 

 elongate, much narrower than the elytra, almost wholly impunctate 

 toward the middle throughout the length, very sparsely punctured 

 toward the sides ; prothorax nearly as in cribratum, very remotely and 

 rather feebly punctate, the sides more converging anteriorly, the apex 

 distinctly narrower than the base; elytra but little longer than wide, as 

 long as the prothorax but much wider, the punctures scarcely as coarse as 

 in cribratum and very much sparser, rather distinctly serial throughout; 

 abdomen slightly narrower than the elytra, finely, rather closely punc- 

 tate, with the pubescence much more distinct than elsewhere as in cri- 

 braUim, Male with the fifth veutral unmodified as in cribratum, the sixth 

 with a narrower and deeper triangular incisure, about half as wide as 

 the apex, less gradually formed and much deeper than wide, the angle 

 at the bottom narrowly rounded. Length 7.7 mm.; width 1.3 mm. 

 South Dakota (Volga) rnbripenne n. sp. 



There may be several closely allied forms in the Pacific 

 coast region besides the very distinct tumidum, but it seems 

 best to recognize only two species as known by material 

 already collected, one — pacijicum — with large elytra, much 

 longer and wider than the prothorax, and the other — cali- 

 fornicum — with small elytra, about as long as the prothorax 

 and but little wider. To the first I have attached a subspe- 

 cies based upon differences of facies and slight modifications 

 of the male sexual characters. The other also appears to 

 have some slightly modified derivatives or subspecies, but 

 they are not defined at the present time, it being better to leave 

 this difficult investigation for a future study with more ample 

 material. The last two species of the table are aberrant and 

 suggest Lissohiops in certain special characters, such as the 

 more apically narrowed prothorax and coarse, sparse sculp- 

 ture. Properum of Horn, which is the only described 

 species not represented before me, appears to be more closely 

 related to Cryptobiella, as shown by the original description; 



