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 low. damp woods. Often gregarious. April 4- 

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



:;: 1349 ('4076). Adelocera 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 

 8-11 mm. 



Throughout the State: frequent. January 18-December 20. 

 Hibernates beneath bark and logs : most common in April and May. 



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

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

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

 thickly and irregularly blotched with whitish scales, length 11-1 i 

 mm., is known from Michigan and Wisconsin. 



1350 (40SO). Adelocera avita Say. Trans. Amer. Phil. Soc. VI. 1S36.. 1S2; 



ibid. II. 620. 



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

 with elongate yellow scales : legs and antennae paler. Thorax oblong, con- 

 vex., sides sinuate in front of hind angles, thence slightly curved to apex: 

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

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

 coarsely punctate than thorax. Length 12-14 mm. 



Putnam and Crawford counties: scarce. July 1— July 2. De- 

 scribed from Posey County. Kesembles impressicolUs but larger, 

 more convex, and with tarsal grooves wholly absent. 



1351 (40S1). Adelocera obtecta Say. Trans. Amer. Phil. Soc. VI. 1S3G, 



181 : ibid. II. 61S. 



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 beyond the middle : surface, as that of thorax, densely and 

 coarsely punctured. Length 15 mm. 



Steuben and Marshall counties ; rare. A northern species which 

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



