THE LAMELLICOHN BEETLES. 



nn. Thorax less densely and not continently punctured, without an ele- 

 vated median line. 

 o. Fifth ventral of male deeply concave and granulate behind the 

 middle, with an oblique ridge each side; thorax coarsely and 

 rather closely punctate, the median line smooth. 



1825. RUGOSA. 



oo. Fifth ventral of male with a strongly elevated, overhanging 

 curved ridge, sometimes divided at middle; thorax more finely 

 and irregularly punctured, having smooth spaces but no smooth 

 median line. 1820. hornti. 



L. crassissima Blanch., length 15-21 mm., is known from New 

 York, Illinois, Kansas and Texas. 



1815 (10,235). Lachnosterna inversa Horn, Trans. Ainer." Ent. Soc, XIV, 



1887, 241. 



Oblong-oval, scarcely broader behind. Reddish- or chestnut-brown, mod- 

 erately shining. Clypeus feebly emarginate, rather closely punctate. Tho- 

 rax with sides nearly parallel behind, slightly curved in front of middle, 

 margin entire, sparsely ciliate; surface with moderately coarse punctures 

 not closely placed. Elytral punctures more closely placed than those of 

 thorax, distinctly rugulose along the middle; discal and submarginal costa? 

 very feeble. Male with antennal club nearly as long as the stem ; last ven- 

 tral segment broadly and transversely impressed ; inner spur of hind tibia? 

 broad, short and obtuse. Length 15-18 mm. (PL II, fig. 383.) 



Vigo and Knox counties; scarce. May 9-May 29. Taken at 

 electric light. Resembles fusca but shorter, more slender and with 

 the elytra more distinctly rugulose or wrinkled; the male ventral 

 characters also widely different. 



1816 (5761). Lachnosterna micans Knoch., New Beytr., 1801, 77. 



Oblong, slightly broader behind. Brownish-black, surface with a hoary 

 coating. Clypeus concave, very slightly emarginate, its surface rather 

 coarsely, not closely punctate. Thorax with margins entire or nearly so ; 

 surface rather coarsely, sparsely and irregularly punctured, the median line 

 smoother. Elytra punctured similarly to thorax. Metasternum densely 

 punctured, the hair rather long and dense. Male with antennal club shorter 

 than stem; fifth ventral with a feebly elevated curved ridge at middle; last 

 segment irregularly concave ; inner spur of hind tibije half the length of 

 outer, slender and slightly curved outwardly. Length 15-17 mm. (PI. I. 

 fig. 382.) 



Monroe, Lawrence, Gibson and Perry counties; frequent. May 

 16-June 21. One of our smaller species, easily known by the hoary 

 coating. When this is removed the color is dark reddish-brown. 



