404 srr.y.YMiLY x. 



KEY TO SPECIES OF IDIOSTETITUS. 



a. Elytra without scattered white scales; antennal scape more abruptly 



club-shaped. 

 &. Met-episterna and sides of abdomen not densely scaly; club smaller, 



its basal joint composing about one-half its mass. 



c. Smooth median line of thorax distinct; sculpture coarse; males 

 often with an acute tubercle or spine before the front coxag. 



621. TITBULATUS. 



oc. Thorax without smooth median line; sculpture much finer; males 



without tubercle or spine. 622. SUBCALVUS. 



lib. Met-episterna and sides of abdomen very densely clothed with oval, 



over-lapping white scales; club larger, its basal joint constituting 



only one-third its mass. 623. ELLIPSOIDEUS. 



aa. Elyti'a with widely scattered slender white scales; antennal scape 



gradually clavate; smooth line of thorax entire. 624. DISPERSUS. 



621 (8910). IDIOSTETHUS TUBULATUS Say, 1831, 20; ibid, I, 285. 



Oval, rather robust. Black, shining, antenna?, tibia? and tarsi dark 

 reddish-brown. Beak slender, strongly curved, about one-half longer than 

 thorax, striate, densely and finely punctate. Thorax two-thirds wider 

 than long, sides feebly converging from base to apical third, then broadly 

 rounded to the strongly constricted apex; disc with punctures coarse, deep, 

 rather dense, more or less confluent lengthwise. Scutellum small, widely 

 notched at apex. Elytra one-fourth wider at base and twice as long as 

 thorax; stria? coarse, deep, strongly punctate; intervals narrow, feebly 

 concave, each with a row of rather coarse shallow punctures bearing very 

 short white hairs. Prosternum of male usually unarmed, but often (var. 

 strigapunctus Hamilton 1893, 309), with an acute tubercle or short curved 

 spine in front of each coxa. Length 2.8 3.7 mm. 



dark, Posey and Perry counties, Ind., scarce; April 22 May 

 (>. Hopatcong, Fort Lee and Orange Mts., X. J. Ranges from 

 New York to Wisconsin south to Florida. Occurs on Crut<rc/us; 

 also found in flowers of orchids in June, and in the small pur- 

 ple-fringed orchis, Blephari glottis pxi/t-hotlcs L., in July. (Har- 



Although ("asey in his table to genera of Barini (1892, 468), 

 stales that "the prosternum is never armed in the male" in those 

 genera following Linutolxirix, yet in two of the males of /. tultu- 

 Itil it fs at hand there is an acute curved spine in front of each 

 coxa, while two others hear acute tubercles in the same place. 

 Hamilton, in his description of strh/apiuiftiiK says: "The male 

 has an acute tubercle before the anterior coxa 1 ; in one example 

 a spine as in some Centrums" 



622 (8948). IDIOSTKTIIUS SUBCALVUS Lee., 1878, 622. 



Oval, convex. Black, shining, very thinly clothed with short, grayish, 

 semiprostrate hairs; antenna?, tibia? and tarsi more or less reddish-brown. 

 Beak about as long as head and thorax, feebly curved, finely and densely 



