978 



FAMILY L . SCAR A BM I DM . 



1S31 (10,258). Lachnosterna delata Horn, Trans. Amer. Ent. Soc, XIV, 

 1887, 267. 



Oblong, slightly broader behind. Piceous brown, head and thorax more 

 shining; sparsely clothed with short, semi-erect grayish hairs. Clypeus 

 rather deeply and broadly emarginate, its surface densely and coarsely 

 punctate. Thorax with margin subcrenate and ciliate ; surface with coarse, 

 deep punctures not closely placed, each with a short, semi-erect hair. Ely- 

 tra finely and rather closely punctate, the eostse indistinct. Male with ab- 

 domen feebly flattened at middle, the fifth segment broadly and rather 

 deeply depressed behind the middle, with an oblique fold each side; last seg- 

 ment acutely notched at apex and with a shallow concavity marked with a 

 longitudinal line. Length 15-17 mm.. (PI. Ill, fig. 392.) 



Orange County; rare. May 28. Two specimens taken at elec- 

 tric light. Known only from Kentucky and Illinois. Resembles 

 hirsuta but more oval, less hairy and with 10-jointed antenna?. 



1832 (5777). Lachnosterna ilicis Knoch., Neue Beytrage zur Insect, 

 1801, 79. 



Oblong, slightly broader behind. Brown, more or less opaque ; head pic- 

 eous ; elytra pruinose. Clypeus rather deeply emarginate, surface very 

 densely and coarsely punctured. Thorax widest at middle, slightly nar- 

 rowed at base, side margins crenate and ciliate; surface densely granulate- 

 punctate, covered with a rather close, recumbent pubescence ; usually with 

 a slightly elevated smooth median line. Elytra densely punctate and finely 

 rugulose; discal costse indistinct, submarginal moderately distinct. Male 

 with abdomen flattened at middle, the fifth segment broadly transversely 

 impressed with an oblique ridge each side ; last segment irregularly concave, 

 distinctly emarginate at apex. Length 19-23.5 mm. (PI. V, fig. 401.) 



Throughout the State ; frequent. April 22-July 24. Our largest 

 hairy species. 



L. ciliaia Lee, length 20-21.5 mm., is known from Wisconsin, 

 Illinois, Missouri and Georgia. 



Group F. 



In this group the spurs of hind tibia? of male are both free, 

 movable and slender. The species vary much in form and size and 

 comprise the Indiana species of Groups XII, XV, and XVI of 

 Horn. Three have been taken in the State, while two others per- 

 haps occur. 



KEY TO SPECIES OF GROUP F. 



a. Antenme 10-jointed ; body more or less hairy. 



b, Clypeus more or less emarginate, extended on to the eye at base. 

 c. Margin of thorax strongly crenate; pubescence of upper surface 

 yellowish. 1833. crenulata. 



cc< Margin of thorax entire ; pubescence rather dense, white. 



1834. ALBINA. 



