AMERICAN COMPONENTS OF THE TENTYRIIN^ 29I 



8 — Prothorax greatly developed, slightly wider than the elytra. Body 



parallel, convex, polished, piceous-black, with dark rufous legs 

 and antennae ; head barely half as wide as the prothorax, the sides 

 only moderately converging and arcuate, not quite parallel at the 

 eyes, the front broadly truncate, the surface closely, coarsely and 

 evenly punctato-cribrate, with a small and very uneven occipital 

 impunctate spot; prothorax large, three-fourths wider than long, 

 the sides moderately arcuate, becoming more convergent near the 

 apex, the basal angles obtuse, not at all prominent or rounded, 

 the punctures moderately coarse, impressed and separated by 

 about twice their own diameters, becoming slightly coarser, dense 

 and confluent, forming long rugie, in about lateral sixth, except 

 near the reflexed lateral edges ; scutellum well developed, trans- 

 verse, finely punctate; elytra two-thirds longer than wide, barely 

 three times as long as the prothorax, rapidly and obtusely ogival 

 at tip, rather strongly, moderately closely and confusedly punctate 

 except toward the sides, where the punctures are in close-set 

 irregular series, coarser and evidently muricate; abdomen not 

 coarsely but somewhat strongly and closely punctured medially, 

 more coarsely laterally as usual. Length 8.0 mm.; width 3.2 

 mm. Arizona (near Yuma) laticolle n. sp. 



Prothorax fully equal in width to the elytra but not wider in either 

 sex 9 



9 — Form stout, parallel, convex, shining, black or piceous-black, 



with red legs and antennje ; head moderate, though a little more 

 than half as wide as the prothorax in the male, less broadly trun- 

 cate than in laticolle^ with the sides strongly converging and 

 evenly arcuate before the eyes, the punctures coarse, dense, more 

 uneven and subconfluent, the occipital spot small but better 

 defined ; prothorax large, two-thirds wider than long, the sides 

 moderately arcuate, rounding and converging but little more 

 anteriorly, the basal angles right and very slightly prominent, the 

 punctures moderately small and w^ell separated, becoming rather 

 gradually coarse, dense and longitudinally confluent but not 

 forming long or well-defined rugas laterally ; scutellum moderate, 

 transverse, punctured toward base ; elytra nearly as in laticolle^ 

 the punctures small but distinct, confused suturally but close-set and 

 coarse in moderately regular series throughout laterally, where the 

 intervals are unevenly uniseriate with more widely spaced punc- 

 tures, the series very feebly impressed toward the suture ; abdomen 

 finely, sparsely punctate medially, more coarsely on the basal seg- 

 ment. Length 7.3-8.4 mm. ; width 2.8-3.4 i''^'^''- California 

 ( Colorado Desert ) abnorme Lee. 



Form less stout than in abjiorme^ elongate, parallel, strongly convex, 

 shining, dark blackish-castaneous, the under surface piceous, the 

 legs and antenn;^ dark red ; head broadly truncate, the sides only 

 moderately converging before the eyes and arcuate, the angles 

 evident though broadly rounded, the punctures less coarse than 



