716 



TA.MILY XXXVII. ELATEEID.!*:. 



Readily known ])y the dai'k eolor. distinet ridges on each side of 

 median gi-oove of thoi-ax. and al)senee of tarsal grooves. Known 

 otdy from ^Maine, Vermont and Pennsylvania. 



XIV. Lacon Lap. 18:^(5. ((Jr.. "short," referring to the anlennal 



grooves. ) 



This genus differs from AdcJoa ra by its shorter and propor- 

 tionally broader form and by having the antennal grcx)ves very 

 nmch shortened behiiid, second and third joints of antenna^ snb- 

 equal and mneh smaller than those which follow; tarsal grooves 

 obli([ue, shallow and subobsolete. 



*1352 (4085). r.ACON rectangularis Say. Ann. Lye. Nut. Hist., I, 1825. 

 2G3 ; ibid. I, 397. 



()l)long, subdepressed. Dull sooty brown, sparsely 

 clotlu'd witli short, sviberect. stiff whitish hairs, those 

 of the elytra in a double row on each interval. An- 

 teima' paler, reaching only two-thirds to base of tho- 

 rax ; legs reddish-brown. Thorax sulMiuadrate. con- 

 vex, rapidly narrowing before the middle, hind angles 

 rectangular, sides rounded, front margin finely cre- 

 nate; disk convex, without trace of a median im- 

 pressed line, densely and coarsely punctured. Elytra 

 with rows of rather distant medium sized punctures; 

 intervals flat, wider than the stria>. Length 8-9.5 mm. 

 (Fig. 276.) 



(Original.) Lake, Marion and Vigo counties; scarce, ex- 

 cept locally in Vigo County, where it was fonnd rather abundantly 

 on the slope of a high sandy ridge, five miles north of Terre Haute. 

 Here it hibernated beneath chips and chunks. January 1-Decem- 

 ber 12. 



Tribe II. CIIAl.COLEriDIINI. 



To this tril)e belong our largest click beetles. In addition to the 

 characters mentioned in ti'ibal key, they have the hind coxal plates 

 gradually dilated on inner side and sti'ongly toothed at the inser- 

 tion of thighs; mandibles with tips entire, but not prolonged; 

 tarsi not lobed I)ut very densely pubescent beneath and claws simple. 

 Two genera compose Ihe tribe, one of which is represented through- 

 out Indiana, while Ihe single species of the othei- |)crhaps occui's in 

 the soulhern poii ion. 



Fig. 27G. 



