THE LAMELLICORN BEETLES. 



901 



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

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

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

 number of joints increased to ten. 



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

 sterna 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 genus is first divided into six 

 groups, and these, in turn, into species. 



KEY TO GROUPS OF INDIANA LACHNOSTERNA. 



a. Hind tibiae of male with one spur fixed. 



5. Fixed spur of hind tibiae of male very short ; form oblong or elongate, 



subcylindrical. Group A, p. 961. 



1>1). Fixed spur of hind tibiae of male at least moderately long; usually 

 half or more as long as the other. 

 c. Apex of hind tibiae of male with a distinct sinuation or notch on 

 inner edge at base of fixed spur. Group B. p. 902. 



cc. Apex of hind tibiae of male squarely truncate. 

 d. Antennae 10-jointed, 



e. Body above glabrous. Group C, p. 9G5. 



ee. Body' above pubescent. Group E, p. 970. 



del. Antennae 9-jointed; body sometimes hairy- Group D, p. 974. 

 an. Hind tibiae of male with both spurs free and slender. Group F, p. 978. 



Group A. 



Our three species classed in this group are oblong or elongate 

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

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

 long and slender. 



KEY TO INDIANA SPECIES OF GROUP A. 



a. Antennae 10-jointed ; clypeus feebly emarginate. 



6. Inner spur of hind tibiae of male distinct. 1810. ephilida. 

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



glaberrima. 



aa. Antennae 9-jointed; clypeus deeply emarginate. 1S11. longitarsis. 



1810 (5749). Lachnosterna ephilida Say. Journ. Phil. Acad. Nat. Sci.. 

 V, 1825, 190 ; ibid. II, 298. 

 Moderately elongate, subcylindrical. 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 submarginal costa 



