Casey — A Revision of the American Paederini. 37 



strenuum, the fold of the second ventral, however, smaller and about a 

 twelfth or fifteenth as wide as the segment. Length 9.7 mm.; width 



1.5 mm. Illinois illiuiaue n, var. 



Var B— Similar to strenuum but stouter, the head larger, fully as wide as. 

 the eljtra, strongly inflated behind the eyes and rounded at the sides,, 

 similarly punctured; prothorax small, but little longer than wide, 

 similarly sculptured, the base narrower than the apex as in illiniane,. 

 but to a much less degree; elytra distinctly elongate, much longer 

 than in strenuum and more coarsely and somewhat more closely 

 punctured; abdomen broader, very nearly as wide as the elytra, the 

 punctures coarser and a little more close-set. Male unknown ; fe- 

 male with S'xual characters nearly as in strenuum. Length 10.5 mm.; 

 width 1.8 mm. Texas •• spissiceps n. var. 



16 — Abdomen black or piceous, with the last two segments pale in color 



as in bicolor 17 



Abdomen uniform in coloration throughout, pale or blackish in color 18 



17 — Body rather stout, shining, pale red-brown in color throughout, the 



elytra sometimes feebly clouded with piceous toward the suture; legs 

 very pale, the antennae infuscate; head well developed but net quite 

 as wide as the elytra, the sides not inflated, parallel, and nearly straight 

 behind the eyes, then broadly rounded to the neck; punctures only 

 moderately coarse and well separated; prothorax slightly elongate, 

 parallel, distinctly narrower than the head, the punctures rather coarse 

 but not very close-set; elytra but slightly longer than wide, parallel, 

 two-fifths wider and a third longer than the prothorax, the punctures 

 rather coarse, wholly confused and moderately close; abdomen slightly 

 narrower than the elytra, polished, finely, rather sparsely punctate. 

 Male with the transverse fold of the second ventral short and broad, 

 occupying about median tenth of the width, the fovea of the third large 

 and circular, the lobe strongly rounded at tip, not extending quite to 

 the tip of the fourth and occupying about median third ; sixth segment 

 narrow, evenly and broadly rounded at tip; female with the abdomen 

 wholly unmodified. Length 10.5 mm.; width 1.65 mm. Texas (Gal- 

 veston) to New Mexico (Albuquerque) texannm Lee 



18 — Abdomen blackish throughout dorsally, paler beneath; head rather 



small in size, very much narrower than the elytra, parallel and straight 

 at the sides behind the eyes, the basal angles broadly rounded ; punc- 

 tures as in texanum; prothorax as in that species but less decidedly 

 narrower than the head and with the punctures rat her feebler; elytra dis- 

 tinctly elongate, much wider and longer than the prothorax, the punc- 

 tures coarse, deeper and closer than in texanum, confused throughout; 

 abdomen slightly narrower than the elytra, finely and not very closely 

 punctured. Male not at hand; female having the abdomen wholly un- 

 modified. Length 9.3 mm.; width 1.6 mm. Arizona... ventrale Horn 



Abdomen pale in color throughout and concolorous with the remainder of 

 the body 1^ 



19 — Head very sparsely punctured even at the sides. Body not very stout, 

 parallel, shining, pale red-brown in color throughout, the legs very 

 pale and flavate; head well developed, elongate, only slightly narrower 

 than the elytra, the sides parallel and nearly straight for two-thirds of 



