716 FAMILY XXXVir. KLA'rmUD.lS. 



Readily kiidwn 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 Pennsjdvania. 



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



grooves. ) 



This genus differs from Adelorvra by its shorter and propor- 

 tionally broader form and by having the antennal grooves very 

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

 equal and much smaller than those which follow; tarsal grooves 

 oblique, shallow and subobsolete. 



*1352 (4085). Lacon eectangulakis Say, Ann. Lye. Nat. Hist, I, 1825, 

 26.3 ; ibid. I, 397. 



Oblong, subdepressed. Dull sooty browu, sparsely 

 clothed with short, suberect, stiff whitish hairs, those 

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

 tennse paler, reaching 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; disli convex, without trace of a median im- 

 ] tressed 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.) 



Fig. 276. X 5. (Original.) Lgj^-g^ Mariou 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. CIIALCOLEPIDIINL 



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

 characters mentioned in trilial key, they have the hind coxal plates 

 gradually dilated (m 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 ;rf the other perhaps occurs in 

 the southern portion. 



