THE CLICK BEETLES. 763 



1451 (4422). SERICUS SILACEUS Say, Ann. Lyo. Nat. Hist., I, lS2. r >, 2<iO; 



ibid. I, 305. 



Oblong, slender. Dull reddish-yellow to sooty-brown, rather densely 

 clothed with yellow hairs; head and thorax often paler than elytra. Sec- 

 ond and third joints of antenna 1 subequal, together slightly longer than 

 fourth. Thorax one-half longer than broad, scarcely narrowed in front; 

 sides rounded on apical third; disk densely and finely punctate; hind an- 

 gles long, distinctly diverging, not carinate. Elytra with sides parallel to 

 apical third; the stria? with rather large moderately impressed punctures; 

 intervals subconvex, sparsely punctulate, transversely wrinkled. Length 

 G.5-7.5 nim. 



Putnam, Knox and Posey counties; scarce. May 22-June 11. 



1452 (4424). SERICUS FLAVIPENNIS Mots., Bull. Soc. Mosc., 1843. 

 Elongate, slender. Fuscous- or dusky-brown, sparsely clothed with 



yellowish hairs ; legs and basal half of elytra dull yellow. Second and 

 third joints of antenna? short, equal, together one-third shorter than fourth. 

 Thorax two-thirds longer than broad, sides nearly straight, disk finely and 

 very densely punctate; hind angles long, feebly divergent, finely but dis- 

 tinctly cariuate. Elytra with sides attenuate behind the middle, stri.-o punc- 

 tate; intervals rather densely and roughly punctulate. Length 0.5-7 mm. 



Lawrence County; rare. May 23. 



XL. CORYMBITES Lat. 1834. (Gr., "a brush or pencil. ") 



This genus comprises a large heterogeneous group, into which 

 have been shifted species widely different in form, size and color. 

 They all agree in having the clypeus more or less flattened and not 

 margined in front; tarsal joints without lobes, the claws simple; 

 prostermun with a long lobe ; hind coxal plates narrow on the outer 

 end. The genus is badly in need of revision, and no literature ex- 

 cept the widely scattered descriptions is available. About 80 spe- 

 cies are known from ihe United Staters, of which the following have 

 been taken or perhaps occur in Indiana: 



KEY TO INDIANA SPECIES OF CORYMBITES. 



n. Joints three and four of antenna? subequal, or joint three rarely slightly 



longer than four. 

 b. Antenna? serrate; joints 4 to 10 more or less triangular. 



c. Third joint of antenna 1 triangular, not much narrower than fourth ; 



form not strongly robust. 

 <1. Color above not uniform brown or piceous. 

 e. Elytra yellow, thorax black. 



/. Elytra with a common sutural spot and two spots on each, 

 black. 1453. VERNALIS. 



ff. Elytra dull yellow, without spots. 1454. TARSAI.IS. 



ee. Elytra black or piceous. 



