716 FAMILY XXXVII. ELATIvRID^E. 



Readily known by the dark color, distinct ridges on each side of 

 median groove of thorax, and absence of tarsal grooves. Known 

 only from Maine, Vermont and Pennsylvania. 



XIV. LACON Lap. 1836. (Gr., "short." referring to the antennal 



grooves. ) 



This genus differs from Addoccra by its shorter and propor- 

 tionally broader form and by having the antennal grooves very 

 much shortened behind ; second and third joints of antennae sub- 

 equal and much smaller than those which follow; tarsal grooves 

 oblique, shallow and subobsolete. 



*1352 (4085). LACON BECTANGVLARIS Say, Ann. Lye. Nat. Hist., I, 1825, 

 203 ; ibid. I. 397. 



Oblong, subdepressed. Dull sooty brown, sparsely 

 clothed with short, snberect. stiff whitish hairs, those 

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

 tennae paler, read) ing only two-thirds to base of tho- 

 rax; legs reddish-brown. Thorax subquadrate, 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 stride. Length 8-9.5 mm. 

 (Fig. 276.) 



Fig. 276. < 5. (Original.) Lake, Marion and Vigo counties ; scarce, ex- 

 cept locally in Vigo County, where it was found 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. CHALCOLEPIDIINI. 



To this tribe belong our largest click beetles. In addition to the 

 characters mentioned in tribal key. they have the hind coxal plates 

 gradually dilated on inner side and strongly toothed at the inser- 

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

 tarsi not lobed but very densely pubescent beneath and claws simple. 

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

 out Indiana, while the single species of the other perhaps occurs in 

 the southern portion. 



