224 GEO. H. HORN, M. D. 



Male. — Fifth ventral feebly arcuate, sixth short, trapezoidal, truncate at tip 

 and narrower than the last dorsal which is elongate, gradually narrowed toward 

 the tip, the latter rounded. (PI. I, fig. 5). 



Female. — Last ventral semicircular, last dorsal trapezoidal and feebly arcuate 

 at tip. 



The sexual differences in the antennae have been given above, this 

 being our only species in which such exist. 



Occurs in Pennsylvania, Missouri, and Texas. 



C bieolor, (Say.) — Form elongate, body black, feebly shining, thorax 

 (except apical and basal margins), basal half of femora and first two joints of 

 antennre reddish-yellow. Head black, sparsely punctured, labrura and palpi 

 yellow, eyes prominent. Antennae black except at base, longer than one-third 

 the body, joint two very little shorter than the following, three to ten elongate, 

 nearlv equal, feebly subserrate, eleventh longer, paler at tip. Thorax one half 

 longer than wide, feebly constricted in front, moderately conipressed at sides 

 behind, median convexity at sides moderately strong, no ante-basa) impression, 

 disc very sparsely punctate, color reddish-yellow with a narrow basal and 

 apical black margin. Scutellum transversely oval. Elytra twice as wide as 

 thorax at base, humeri distinct, sides parallel, apices conjointly rounded, disc 

 moderately convex, with striae of moderate punctures becoming gradually 

 feebler to apex- color black, epipleurse paler. Body beneath piceous, very 

 sparsely and finely punctured, abdomen with paler spots at the side of each 

 segment. Legs black, base of femora yellow, tibise at tip piceous or somewhal 

 paler. Length .30— .36 inch ; 7.5—9 mm. 



Male. — Fifth ventral arcuate at tip, sixth short, semicircular, feebly emargin- 

 ate at tip, last dorsal longer and broader, longer than wide, -broader at tip with 

 angles broadly rounded and tip emarginate. (PI. I, fig. 6). 



Female. — Fifth ventral truncate, sixth semicircular and yellow, last dorsal 

 oval at tip, longer than the last ventral, also yellow. 



Occurs in the Middle and Gulf States, but is not common. May 

 be easily known by its coloration. 



The preceding and all the following species have the antennae so 

 nearly similar in their constituent parts, that no detailed description 

 will be given in each, the following will answer for all : joint one stout, 

 conical, slightly curved, two very little shorter than three, three to ten 

 subequal, very gradually decreasing in length, eleventh longer and 

 subacute. 



C inoriiata, (Say.) — Form slender, color piceous, moderately shining, 

 sparsely i)ubescent. Head sparsely and finely punctate, eyes feebly proniinenL 

 Antennse ferruginous, nearly half the length of the body. Thorax nearly 

 cylindrical, feebly narrowed at base, sides before and behind the middle 

 slightly compressed, surface sparsely punctate. Scutellum transversely oval, 

 emarginate at tip. Elytra of form and sculpture of bicolor. Body beneath 

 and legs brownish, coxie and tarsi paler, abdomen very finely and sparsely 

 punctate, each segment with a yellow spot at the sides. Length .30 — .36 inch; 

 7.6 — 9 mm. 



