KiO SUBFAMILY IX. OTIORHYNCHIN.K. 



KEY TO EASTERN SPECIES OF POLYDRUSUS. 



a. Scape long, slender, reaching far beyond the eyes; the latter small, 



separated by nearly twice their own diameters. 



I). Color brown, the scales gray and pale brown. 168. AMERICAN us. 



bit. Color black, the scales pale green. 169. IMPRESSIFRONS. 



act. Scape shorter, reaching hind border of eyes, the latter much larger, 



separated by about their own diameters; color black, the scales 



green. 170. SEKICEUS. 



168 (8333). POLYDRUSUS AMERICANUS Gyll., Schn., 1834, 136. 

 Oblong-oval, narrowed in front. Brown, shining, rather densely clothed 



with pale gray and cinnamon-brown scales, the latter forming a dark 

 stripe on vertex, three narrow stripes on thorax, and large discal blotch on 

 elytra; under surface piceous, shining; antennae and legs reddish-brown. 

 Head and beak as long as thorax, sparsely punctured. Thorax subcylindri- 

 cal, as wide as long, apex obliquely, base squarely truncate, sides feebly 

 curved, disc sparsely punctured. Elytra nearly twice as wide as thorax, 

 humeri prominent; disc striate, striae finely punctured; intervals flat, each 

 with a single row of short, stiberect hairs. Length 5 5.5 mm. 



Lawrence and Kosciusko counties, Ind., scarce; April 28 

 June 3. Taken by sweeping. Portage, X. Y., common on beech; 

 May 1*4. Ranges from New York, Michigan, and Toronto, Can- 

 ada, south and west to Maryland and Kansas. Near New York 

 City under stones in early spring and in December; on various 

 plants in July and August. No record of its food habits can be 

 found. The brown blotch on elytra is widest just behind their 

 middle and extends forward on the first three intervals to the 

 base. Cyp1toniiinii$ (lorftalis Horn is a synonym. 



169 (- ). POLYDRUSUS IMPRESSIFRONS Gyll., Schn., 1834, 140. 



Elongate-oblong, slender. Black or fuscous, body everywhere densely 

 clothed with small, round pale green scales; antennae and legs pale red- 

 dish-brown. Beak short, its tip deeply and broadly emarginate; front im- 

 pressed, deeply punctured. Thorax subcylindrical, as wide as long, base and 

 apex truncate, sides somewhat rounded, finely punctate. Elytra one-half 

 wider at base than thorax; disc finely punctate-striate; intervals wide, flat, 

 each with a row of very short, reclined bristles. Length 4.7 5 mm. 



A European species taken by H. H. Knight at Geneva, Batavia 

 and Portage, N. Y., May 22 June 18. New Haven, Conn. ; Na- 

 tional Museum collection. The color of the scales is said by Oyl- 

 lenhal to vary sometimes to greenish-blue or yellowish-green. 

 "Especially numerous and mating on small plum trees, the adults 

 feeding on the green plums and leaves, but no eggs or larva 1 could 

 be found." (Kni</lit.) 



170 (- -). POLYDRUSUS SERICEUS Schall., 1783, 286. 



Elongate-oblong, somewhat robust. Black, rather densely clothed above 

 and beneath with rounded metallic-green scales; antennae and legs pale 

 reddish-brown, very sparsely scaly. Beak indistinctly carinate behind the 



