Baring 493 



also the confusa section, the latter having notably strong and close 

 thoracic punctuation. In stating the length of the beak, the 

 language here used should be taken literally; comparisons are made 

 with the prothorax alone, or with the head and prothorax, the former 

 should never be interpreted as equivalent to the latter. 



Cylindridia n. gen. 

 In this group the body is narrow, convex, parallel and cylindric 

 in form, subglabrous and with shining and very sparsely, finely 

 punctured integuments. In the male the prosternal spines are 

 greatly developed, extending, from a dorsal viewpoint, far in front 

 of the head as a rule, and, just in front of them, there is a deep 

 rounded fossa. The antennae are of the usual type in the preceding 

 genus, the beak not separated from the head by a decided depres- 

 sion, and the scutellum is nude and subquadrate. Besides the type 

 of the genus, Centrinus prolixus Lee, and Limnobaris nitidissima 

 Csy., we have the two following species: 



Cylindridia simulator n. sp. — Slender, cylindric, rather strongly shining, 

 deep black, with piceous tarsi, the squamules above very small and 

 remote, slightly more visible at the thoracic sides; beneath they are 

 extremely small and sparse but closer, whiter and more distinct on the 

 met-episterna; beak (cf ) stout, feebly arcuate, moderately punctulate 

 and as long as the prothorax, or (9 ), more slender and smoother, feebly 

 arcuate and a little longer than the prothorax; antennae at the middle 

 (d^) or slightly behind the middle (9); prothorax barely as long as 

 wide (9), or longer than wide (cf), the parallel and almost straight 

 sides rapidly rounded apically to the tubulate apex, which is nearly three- 

 fifths as wide as the base; punctures very fine and sparse, more distinct 

 laterally; elytra more than twice as long as wide, very slightly wider 

 than the prothorax and distinctly more than twice as long, the sides 

 parallel and straight, obtusely rounded in about apical third; humeral 

 callus small but evident and abrupt; striae fine; intervals nearly five 

 times as wide as the grooves, each with a single series of small and widely 

 distant punctures; male with the tip of the pygidium exposed, the 

 abdomen narrowly impressed medio-basally, the prosternal spines long 

 and testaceous, curving outwardly beyond the head. Length (cf 9 ) 

 2.6-3.2 mm.; width 0.7-0.9 mm. Colorado (Greeley), — Wickham. 

 Four examples. 



DifTers from prolixa in its smaller size, more slender form and 

 more rapidly and apically rounded sides of the prothorax toward 

 the base of the tubular apex. 



Cylindridia perexilis n. sp. — Still much smaller and more slender than 

 the preceding, but similar in color, lustre, sculpture and in the small, 



