136 NORTH AMERICAN 



slightly more slender than the seventh ; eighth one-half longer than wide, 

 joints of club increasing very rapidly in length, of nearly equal width ; 

 maxillary palpi very long and slender, pale flavate throughout, second and 

 third joints equal in length. Prothorax sub-cylindrical, arcuately, evenly, 

 and very gradually increasing in width to a point slightly behind the middle, 

 where it is nearly one-sixth narrower than long; sides thence very feebly 

 convergent and strongly sinuate ; anterior margin slightly shorter than the 

 posterior, nearly equally arcuate; surface nearly evenly ellipsoidal ; punc- 

 tures transversely coalescent, rather close, interspaces very convex, polished. 

 Elytra at base as wide as or very slightly wider than the head ; sides nearly 

 parallel, almost straight near the humeri, distinctly arcuate near the apices, 

 longer than the width at base ; together narrowly and strongly einarginate 

 behind; suture distinctly longer than the pronotum ; surface very convex, 

 feebly and narrowly impressed along the suture ; coarsely, evenly, and deeply 

 punctate ; punctures round, impressed, and not coalescent ; interspaces as 

 wide as the punctures, very convex, highly polished. Abdominal segments 

 decreasing uniformly and very gradually in width, first much narrower than 

 the contiguous elytra, cylindrical ; surface rather coarsely, closely, and evenly 

 punctate near the base ; punctures deeply impressed and becoming so fine 

 toward the tip as to almost disappear ; interspaces very highly polished ; 

 border nearly obsolete except on the first segment, where it becomes rapidly 

 narrower toward the segmental apex ; transverse carinae tricuspid, middle 

 cusps long, strong, and finely acuminate, prominent, lateral very rudimen- 

 tary. Legs long and very slender, flavate, femora clouded with piceoUs 

 toward the tip, tarsi very long and slender ; first joint of the posterior nearly 

 two and one-half times as long as the second, twice as long as the fifth, and 

 as long as the second, third, and fourth together, fourth scarcely one-half as 

 long as the third, fifth much more slender than the preceding. 



Male. — Fifth ventral segment very feebly einarginate in its middle third 

 at apex, emargination not measurable, evenly rounded, contiguous surface 

 cylindrically and feebly impressed throughout anteriorly, pubescence very 

 coarse; sixth triangularly, narrowly, and very deeply incised at apex, in- 

 cisure fully twice as deep as wide, angles somewhat rounded. 



Female. — Fifth segment einarginate in its middle eighth at apex, emargina- 

 tion evenly rounded, and about eight times*as wide as deep ; sixth segment 

 narrow, rather obtusely rounded at apex. 



Length 3.2-3.7 mm. 



Cedar Keys, Florida, 1 ; Columbus, Texas, 1 ; Arizona, 5 ; Colo- 

 rado, 2 ; Southern Illinois, 2. 



The specimen of this well-marked species from Texas differs from 

 the one from Florida in no essential feature ; it appears, however, to 

 be slightly more mature, and the basal joints of the antennae are pale 

 piceo-testaceous, the remainder being nearly piceous-black ; it is the 

 smallest of the entire number, and is a female. 



The above description was taken from the Floridan female. 



