THE CLICK BEETLES. 715 



deep median sulcus; sides nearly straight, surface densely and coarsely 

 punctured. Elytra gradually but feebly narrowed from base to tip, densely 

 and rather coarsely punctate. Length 15-17.5 mm. 



Throughout the State ; frequent. Occurs beneath bark of dead 

 trees, usually in lo«-, damp woods. Often gregarious. April 4- 

 August 10. Our largest and broadest siiecies of the genus. 



*1349 (4076). Adeloceka discoidea Web., Obs. Ent., 1801, 77. 



Oblong, subdepressed. Black, feebly shining; head and broad margin 

 of thorax densely covered with narrow golden yellow scales. Thorax ob- 

 long, with a rather deep median sulcus ; sides nearly straight, curved on 

 apical fourth ; surface, as well as that of elytra, densely and coarsely punc- 

 tured. Tarsal groove long, shallow, parallel to the antennal groove. Length 

 S-11 mm. 



Throughout the State; frequent. January iS-Deci-niber 20. 

 Hibernates beneath bark and logs ; most common in April and ]ilay. 



A. maculafa Lee, black, length 13 mm., is recorded from near 

 Cincinnati. Dury has also wrongly recorded A. aurorata Say from 

 there, the specimens being avita. A. hrevicornis Lee, sooty-brown, 

 thickly and irregularly blotched ^\ith whitish scal'>s. length 14^17 

 mm., is known from ^Michigan and Wisconsin. 



1350 (40S0). Adelocera avita Say, Trans. Amer. Phil. Soc, VI, 1836, 182; 



ibid. II, 620. 

 Elongate, slender, subconvex. Dark reddish-brown, sparsely covered 

 with elongate yellow scales; legs and antennfe paler. Thorax oblong, con- 

 vex, sides sinuate in front of hind angles, thence ' slightly cuiwed to apex; 

 disk distinctly suleate on basal half, often with a shallow rounded fovea 

 each side near base. Elytra convex, irregularly and densely but less 

 coarsely punctate than thorax. I^ength 12-14 mm. 



Putnam and Crawford counties ; scarce. July 1-July 2. De- 

 scriljed from Posey County. Resembles impressicollis but larger, 

 more convex, and with tarsal grooves wholly absent. 



1351 (4081). Adeloceka obtecta Say, Trans. Amer. Phil. Soc, VI, 1836, 



181 ; ibid. II, 618, 

 Elongate, subdepressed. Piceous or very dark reddish-brown, with 

 sparse, widely scattered pale scales. Thorax oblong, sides feebly curved 

 from near hind angles to apex, margins rather broadly flattened; disk with 

 a wide and deep median groove, hind angles rather broad and distinctly 

 divergent. Elytra with two indistinct elevated lines on basal half, one of 

 which extends lie.vond the middle; surface, as that of thorax, densely and 

 coarsely punctured. Leni;th 15 mm. 



Steuben and ^larshall counties; rare. A nurtliern species which 

 belongs to the Transition life zone of the State. July 6-July 30. 



