Casey — A Revision of the American Paederini. 37 
strenuum, the fold of the second ventral, however, smalJer and abouta 
twelfth or fifteenth as wide as the segment. Length 9.7 mm.; width 
125 mi Wom. os ho oss ese cchs pecsmese seeesons ¢54cERIRMO 0. Var. 
Var B— Similar to strenuum but stouter, the head larger, fully as wide as. 
the elytra, 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 sexual characters nearly as in strenuum. Length 10.5 mm.; 
Width 1.8 mm. Texas....eceescceeecceceerecsesss Spissiceps 0. var. 
16 — Abdomen black or piceous, with the last two segments pale in color 
SH:1 BIGODO ia Pirate kedelks bene hoes Kobe ahbe ake en) webbie nde en dwhalees 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 nit 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 (Gai- 
veston) to New Mexico (Albuquerque)...... coeoee cess teXanum Lec. 
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 rather 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 1.6mm. Arizona...yentrale Horn 
Abdomen pale in color throughout and concolorous with the remainder of 
THE DODGY... vind cd seoe sender sedne sccm dees ocec dose denebdstonseccdenesc le 
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 
