— 199— 



Thorax without apical and ba>al margin of paler pubescence; 



Sides of thorax regularly arcuaie colonus. 



Sides of thorax suddenly obliquely narrowt-d at basal third, . . . .annosus. 

 Thorax margined at base and apex with yellow or white pubescence: 

 Median elytial band more or less angulate orundulatory; thehumera! band 



when present short and tran> verse. undulatus. 



Median band regularly arcuTHe;the humeral band always present and very 



oblique, obliteratus. 



Elytrai apices separately rounded, mormornia. 



Most of the species are easily recognized; the frontal carina oUtilidtis 

 is distinctive, 4 maculatus, coftvergens and ob/iterattts have distinctive 

 markings, sagiila(u< is the only species with well developed spines on 

 elytrai tips, colonus alone possesses bands as broad as the intervals be- 

 tween them. The others are described in detail below. 



X. nitidus Horn Ac. Phil, i860, p. 572, t. 8, f. 2. 



Length 12 mm. =48 ins. Hab. N. J., Pennsylvania, Texas. 



Black, shining, with narrow yellow margins. Legs testaceous, hind 

 thighs darker at tip. Beneath spotted and banded with yellow. The 

 enclosed mark is an oblique line, directed towards suture. 



X. 4-niaculatus Hald. Trans. Am. Phil. X 1857, p. 41; Lee. J. A. P. ser. 2 II, 

 p. 29. 



Length 8 12 mm. =.32-48 ins. Hab. Eastern and Middle States, 



Black or light brown, elytra in black specimens mostly brownish. 

 Thoracic spots usually veiy distinc t, elytrai markings white, a few scat- 

 tered hairs and lines, scarcely visible. Mr Wenzel tells me this species 

 is taken by beatmg the Black Alder, 



X. convergens Lee. S. M. C. 1873, p. 198. 



Length 8-11 mm.=,32-.44 ins. Hab. Ohio, Iowa. 



Black or fuscous, thighs pale at base pubescent beneath and bands 

 above narrow yellowish white. The thoracic spots resemble \-maculalus 

 somewhat but are nearly connected. Five specimens show no variation 

 except in size. 



X. obliteratus Lee. S. M. C. 1873, p. 199; insignis Lee. (9)1. c. 



Length 11-20 mm. =.44 -80 ins. I lab. Colorado; California. 



Black or brown with broad yellow bands on the elytra, following 

 the usual pattern, and margining the thorax. In the (^ the middle band 

 is usually entirely obliterated. In two specimens before me also males 

 the bands are partly obscured by a sprinkling of cinereous pubescence 

 mdicating that the species may vary quite as much as undulalus. All 

 the females I have seen are constant in marking. For the synonomy m\ 

 above I am indebted to Mcssns Ricksecker and Rivers. Mr. Rickseckei 



