Casey — A Revision of the American Paederini. 27 



abdomen narrower than the elytra; legs slender, the hind tarsi Ions, only 

 slightly shorter than the tibiae, the basal joint not quite as long as the 

 next two but longer than the last. Europe * Cryptobium 



11— Form narrow, subfu>iform, the head small and much narrower than 

 the elytra, only feebly convex, the integuments polished and devoid of 

 minute sculpture throughout, the punctures moderate in size, not very 

 close-set and simple; head oblong, the sides parallel or feebly converg- 

 ing behind the eyes to the broadly rounded basal angles, moderately 

 narrowed before the eyes, which are rounded behind, prominent and 

 situated well before the middle; post- ocular areolae distinct, the sur- 

 face between them sometimes tumid; labrum nearly as in Crypto- 

 bium; basal joint of the antennae moderate; neck barely two-fifths as 

 wide as the head, meutum trapezoidal, coriaceous only at apex, deeply 

 impressed along the basal margin; gular sutures becoming extremely 

 approximate behind the middle; prothorax very narrow and elongate - 

 oval, parallel, much narrower than the head; elytra almost twice as 

 wide as the prothorax and very much lont^er, notably elongate, parallel, 

 the suture strongly beaded; abdomen narrow, the segments feebly im- 

 pressed at base; legs rather short, very slender, the hind tarsi notably 

 short, the first and fifth joints subequalin length and much longer than 

 the others which are relatively more elongate than usual. Southern 

 North America Ababactns 



12 — Body parallel, rather convex, more or less densely and coarsely but 

 simply punctate; head oblong-elongate, usually parallel at the sides, 

 with broadly rounded basal angles; neck broad, about three-fifths as 

 wide as the head; eyes well developed, convex and prominent, situated 

 distinctly before the middle of the length; basal joint of the antennae 

 as long as the next four combined, the joints not constricted at base; 

 labrum short, truncate, bidenticulate, the teeth separated by a rounded 

 and rather shallow median sinus of moderately large size; post-ocu'ar 

 foveolae large and well developed, rather approximate, the surface 

 between them longitudinally tumid; membranous lobes of the 

 ligula narrow, well separated, arcuate toward each other, the basal 

 parts corneous as usual; mentum large, trapezoidal, flat, the apical part 

 coriaceous, the dividing line posteriorly arcuate; second maxillary 

 palpal joint sparsely setulose, the third rather longer than the second, 

 moderately stout, obconical, with the apex slightly narrowed, the sur- 

 face dull in lustre, finely and closely pubescent, the fourth joint smaller 

 than usual, acutely conical; prothorax oblong, parallel, narrower than 

 the head; elytra parallel, wider than the head and usually longer than 

 the prothorax, the suture strongly beaded; abdomen parallel, nearly or 

 quite as wide as the elytra, the segments distinctly impressed at base; 

 legs slender, moderate in length, the hind tarsi Ions:, slender, of the 

 usual form, the basal joint as long as the next two and longer than the 

 fifth. Japan *Monocrypta 



The majority of the above genera being foreign to our 

 territories, it is necessary to remark upon those thus indi- 

 cated above before proceeding further : — 



