THE LAMELLTCORN BEETLES. 



965 



1S14 (5773). Lachxosterxa prumina Lee, Journ. Phil. Acad. Nat. Sci., 

 III. 1S56. 251. 



Oblong-ovate, moderately robust. Dark reddish- or chestnut-brown to 

 pieeous, the surface usually with a purplish or hoary coating. Clypeus 

 broadly emarginate. densely punctured, the front more coarsely and roughly 

 punctured. Thorax with margin serrate, sparsely ciliate : disk with very 

 coarse, closely placed punctures, dense near the front angles, the median 

 line usually smooth. Elytral punctures fine, indistinct, sparsely placed ; all 

 the costa? moderately distinct. Meta sternum densely punctured, the hair 

 long and dense, male: sparser and much shorter, female. Male with an- 

 tennal club a little longer than the funicle; abdomen flattened at middle, 

 fifth segment with a strongly elevated, rugose ridge behind which the seg- 

 ment is rather deeply impressed; last segment irregularly concave, with 

 small granulations. Length 17-21 mm. (PI. I, fig. 378.) 



Lake and Vigo counties ; scarce. June 7-August 11. A num- 

 ber of specimens have been taken along; the beach of Lake Michigan. 

 Said to occur on raspberry bushes. Ranges from Ohio and Michi- 

 gan to Kansas and Texas. 



Gboup C. 



To this group belong a number of our best known and most com- 

 mon species. All agree in having the body not pubescent above, 

 usually shining,' rarely pruinose or iridescent: antennae lO-jointed; 

 clypeus usually emarginate ; hind tibia? truncate at apex, without 

 trace of sinuation at the base of the fixed spur, this spur usually 

 long and straight. Twelve species have been taken in the State, 

 while four others perhaps occur. 



KEY TO INDIANA SPECIES OF GROUP C. 



a. Clypeus not densely punctured, its margin moderately reflexed. feebly 

 emarginate; side margins of thorax not serrate, disk never very 

 coarsely punctured. 

 h. Last ventral segment of male with a distinct cup-shaped depression : 

 fifth segment with a very feeble transverse ridge near the hind 

 border ; form short and robust ; color pale chestnut brown. 



CBASSISSIMA. 



yob. Last ventral segment of male without any well defined concavity: 

 clypeus distinctly emarginate. 

 c. Fifth ventral segment of male with a semicircular, slightly rugu- 

 lose depression, without a transverse ridge. 1S15. ixversa. 



cc. Fifth ventral segment of male with a transverse, more or less 

 sinuous ridge in front of the hind margin of the segment. 

 d. Surface with a conspicuous hoary or pruinose coating. 



1S16. MICANS. 



(hi. Surface not at all pruinose. 



