Casey — A Revision of the American Paederini. 123 



2 — Head widest near the base, the sides diverging posteriorly from the 

 eyes. Body very large in size, polished, black, the elytra bright rufous, 

 with a blacli scutellar cloud, the abdomen toward tip, legs and antennae 

 pale ferrugitjous; head large, rather wider than long, very coarsely 

 and sparsely punctate, the sides broadly arcuate; angles rather nar- 

 rowly rounded, the base broadly arcuato-truncate; eyes moderate; an- 

 tennae long and slender, filiform, not at all incrassate distally, longer 

 than the head and prothorax, the medial joints more than twice as long 

 as wide and much longer than the subapical; prothorax only very 

 slightly longer than wide and somewhat wider than the head, strongly 

 obtrapezoidal, the sides straight; punctures rather coarse, very sparse, 

 irregular, excepting a single close-set series at each side of the broad 

 median smooth line ; elytra quadrate, parallel, very slightly wider and 

 longer than the prothorax, the punctures rather fine and arranged in 

 uneven series; abdomen narrower than the elytra, shining. Male with 

 the surface of the fifth and sixth ventrals wholly unmodified, the apex 

 of the formor with a broad and very shallow cuspidiform emargina- 

 tiou, the latter with a large triangular apical notch but little wider than 

 deep, one-half as wide as the apex, with its anterior angle slightly 

 blunt; female unknown. Length 10.4 mm.; width 1.4 mm. Arizona 

 (Williams), — JVlr. Wickham centurio n. sp. 



Head parallel at the sides 3 



3 — Head and prothorax black or blackish, always darker than the elytra. 4 



Head black, the prothorax rufous and concolorous with the elytra 7 



Head and prothorax rufous and concolorous with the elytra 10 



4 — Abdomen not rufous at tip 5 



Abdomen distinctly rufous at tip 6 



5 — Body polished, black, the prothorax slightly picescent, the elytra dark 



though clear rufous, with a feeble piceous scutellar cloud; legs and 

 antennae ferruginous; head subquadrate, as long as wide, the sides 

 straight, the angles rounded for a short distance to the neck, which is 

 three-fourths as wide as the head, the punctures coarse, uneven in size 

 as usual and very sparse; antennae a little longer than the head and 

 prothorax, moderately slender, feebly incrassate distally, the medial 

 joints barely twice as long as wide and shorter than the subapical ; pro- 

 thorax oblong, only slightly longer than wide, slightly wider than the 

 head, the sides straight and only just visibly converging throushout, 

 the punctures moderately coarse, very sparse and irregularly distrib- 

 uted, the median smooth line bounded by a narrow closer aggregation 

 of punctures, not regularly serial; elytra quadrate or slightly elongate, 

 parallel, slightly longer than the prothorax and about a fourth wider, 

 the punctures only moderately coarse but strong, arranged in regular 

 and feebly impressed series; abdomen slightly narrower than the elytra. 

 Male with the fifth ventral gradually, very feebly sinuate at the middle of 

 the apex, the adjoining surface glabrous and shining but not impressed, 

 the sixth with a broad shallow, gradually formed, broadly rounded 

 sinus, about two-fifths as wide as the apex and six or seven times as 

 wide as deep, the surface with a large median patch of dense and 

 slightly stouter black hairs; female with the sixth ventral abruptly 



