1111- jj^i.„ji..j.i, wiiK BEETLES. 961 



Moreover, specimens which normally have 10-jointed antennje, some- 

 times, hilt rarely, have two of the joints united, so that the number 

 is reduced to nine. The 9-jointcil species, however, never have the 

 number of joints increased to ten. 



In the papers by Drs. Horn and Smith, 93 species of Lachno- 

 sterua are recognized from the United States. Of these 26 have 

 been taken in Indiana, while nine others perhaps occur. Since the 

 number of species is so large the genas is first divided into six 

 groups, and these, in turn, into species. 



KEY TO GEOCPS OF INDIANA LACIINOSTERNA. 



a. Hind tibiae of male witli one spur fixed. 



6. Fixed spur of hind tibise of male very short ; form oblong or elongate, 

 subcylindrieal. Group A. p. 11(11. 



66. Fixed spur of hind tibise of male at least moderately Ion.?; usually 

 half or more as long as the other. 

 c. Ajx'x of hind tibiae of male with a distinct sinuation or notch on 

 inner edge at base of fixed spur. (iroup /;. p. '.ny2. 



cc. Apex of hind tibiae of male sijuarely truncate. 

 d. Antennae 10-jointed. 



c. Body above .^clabrous. Group f. p. '.lO.'i. 



ee. Body above pubescent. Group i:. p. 9715. ' 



(111. Antenna' 9-jointed ; body sometimes hairy. (iroup D. p. 974.- 



an. Hiud tibiae of male with both spurs free and slender. Group F. p. 07s. 



Geoxjp a. 



Our three species classed in this yrou.p are oblong or elongate 

 and subcylindrieal in form, pale brownish-yellow in hue, and have 

 the inner spur of hind tibise of male short or wanting, the outer 

 long and slender. 



KEY TO INDIANA SPECIES OF GEOUP A. 



a. Antennae 10-jointed ; clypeus feebly emarginate. 



6. Inner spur of hind tibiae of male distinct. ISIO. ephilida. 



66. Inner spur of hind tibiae of male wholly absent; form more slender. 



GIABEBKIMA. 



aa. Antennae 9-jointed; clyiieus deeply emarginate. ISll. longitarsis. 



1810 (5749). Lachnosteena ephilida Say. Journ. Phil. Acad. Xat. Sri., 

 Y, 1525. 190; ibid. IT, 20S. 

 Jloderately elongate, subrylindrical. Pale brownish-yellow, .shining; 

 head and thorax darker. Clypeus broadly rounded or very feebly emargi- 

 nate, coarsely but less densely punctured than the front, the border re- 

 flexed. Thorax short, narrowed In front, rather coarsely, not closely punc- 

 tate. Elytra more coarsely and deeply punctured, the snbmarglnal costa 



