TRIIUO XVIII. BARIXI. 405 



punctate; antennae inserted at its middle, second joint of funicle slender, 

 three-fourths as long as first. Thorax small, conical, one-half wider than 

 long, very finely, densely punctate, the punctures merging to form fine 

 strigee; the median line often finely subcarinate, not smooth. Elytra dis- 

 tinctly wider at humeri than thorax, sides subparallel from humeri to 

 middle, then strongly converging; strife fine, deep; intervals each with a 

 single row of small, shallow punctures, each bearing a minute seta. Pro- 

 sternum strongly impressed along the middle, under surface coarsely and 

 densely punctate. Length 1.82.5 mm. 



Common throughout the southern two-thirds of Indiana, not 

 taken in the northern counties; Apr. IT June 15. Sometimes 

 abundant on the flowers of Pliacclia bipiiDuitifida Michx., and 

 other April- and May-blooming plants. "In great numbers in 

 the flowers of the water-leaf, HydropJiyUuin (t/tpnidiruldtuni. 

 in May." (Dury.) Ranges from Pennsylvania to Michigan, 

 south to Kentucky and Missouri. 



623 (11,197). IDIOSTETI-IUS ELLJPSOIDEUS Casey, 1892, 652. 



Elliptic, ovoidal, convex. Black, shining, antennae, tibiae and tarsi 

 dark reddish-brown; above spai'sely clothed with very small, inclined scale- 

 like hairs. Beak slender, curved, as long as head and thorax, densely 

 rugosely punctate on sides, male; one-fourth longer, much more finely 

 punctate, female. First joint of funicle as long as the next four. Thorax at 

 base one-half wider than long, sides feebly converging to apical fourth, 

 then rounded and constricted near apex; disc rather finely and densely 

 punctate, finely strigose on sides and with a very narrow median smooth 

 line. Elytra one-fourth wider at base than thorax, striae fine, deep; in- 

 tervals slightly concave, their punctures coarse, shallow, close-set, more 

 or less confused toward base. Length 2.8 3.5 mm. 



Known from Illinois, Town and Missouri. Easily distin- 

 guished by the hemi-elliptical outline of elytra, large antenna! 

 club and dense vestiture of sides of abdomen. 



624 (11,198). IDIOSTETHVS DISPERSUS Casey, 1892, 652. 



Oval, rather robust, convex. Black, shining, legs rufo-piceous; vesti- 

 ture sparse and uneven, consisting of minute setae on the thorax which be- 

 come long, slender, recumbent whitish scales on the lateral fifth and in the 

 middle before the scutellum; elytra with a single row of very small setae on 

 each interval, with long, slender scales very widely scattered over the en- 

 tire surface. Beak of male as long as thorax, its sides densely punctate and 

 scaly. Thorax three-fourths wider than long, sides feebly converging from 

 base to apical fourth, then strongly rounded to the constriction; disc un- 

 evenly sculptured, strigose near center, densely punctate on sides, finely 

 and sparsely punctate near basal angles. Elytra one-fifth wider, and more 

 than twice as long as thorax; striae very coarse, deep; intervals flat, each 

 with a row of close-set, rounded punctures. Length 3.3 mm. 



Known only from Alabama. 



