THE POWDER-POST BEETLES. S91 



D. suhstriatus Payk., pieeous, length 4—1.5 mm., is said to occur 

 in the Northern States and Canada; D. pusillus Fab., length 3 mm., 

 is an introduced species which probably occurs throughout the 

 United States. 



Subfamily II. LYCTINAE. 

 Elongate slender species, havino- the head prominent, somewhat 

 narrowed behind the eyes, not covered by the thorax, which is 

 trapezoidal in form and has fine side margins; antennje 11-jointed, 

 with rounded club composed of two joints; front cox^ entirely' en- 

 closed and separated by the prosternum; hind ones widely sepa- 

 rated; first ventral segment much longer than any of the others. 

 The subfamily is represented by but one genus, Trogoxylon Lee. 

 having been merged -nith Lyctus by Casej'.* 



VI. Lyctus Pab. 1792. (A proper name.) 



The characters of the subfamily Lyctince as above given apply to 

 the members of this genus. Four- of the nine known North Amer- 

 ican species have been taken in the State. 



KET TO INDIANA SPECIES OF LYCTUS. 



o. Elytra with rows of large rouuded, very shallow punctures; intervals 

 with a single row of punctures bearing yellowish hairs, which form 

 slightly raised lines ; thorax with an elongate-oval median impres- 

 sion. 1693. STBIATUS. 



aa. Elytra with smaller deeper punctures, usually arranged in more or less 

 distinct rows; thorax rarely with a median impression. 

 6. Thorax longer than wide, the front angles rounded. 



1694. oPACULUs. 

 66. Thorax not longer than wide. 



c. Front angles of thorax roiuided; punctures of elytra in rows; color 



pieeous black. Itj95. planioolus. 



cc. Front angles of thorax not rounded ; punctures of elytra very fine 



and dense, arranged irregularly. 1696. para t.t.elopipidps. 



1693 (5374). Lyctus stbiatus Melsh., Proc. Phil. Acad. Xat Sci., II, 1844, 

 112. 



Elongate, slender. Dull reddish-brown, sparsely clothed with yellowish 

 pubescence. Thorax nearly square, slightly narrowed behind, sides straight 

 nearly to apex ; front angles rounded, hind angles distinct, surface coarsely 

 punctate, with a smoother median impression. Surface of elytra as de- 

 scribed in key. Length 3.5-5 mm. 



Marion and Vigo counties ; frequent. April 25-3Iay 22. Bred 

 from stems of hickory. Probably occurs thi-oughout the State. 



«.^jm. X. Y. Acad. Sci., VI, 1891, 12. 



