THE POWDER-POST BEETLES. 



D. substriatus Payk., picepus, 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,, having the head prominent, somewhat 

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

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

 with rounded club composed of two joints ; front coxae entirely en- 

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

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

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

 having been merged with Lyctus by Casey.* 



YI. Lyctus Fab. 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. 



KEY TO INDIANA SPECIES OF LYCTUS. 



a. Elytra with rows of large rounded, 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. STRIATES. 

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

 distinct rows; thorax rarely with a median impression. 

 1). Thorax longer than wide, the front angles rounded. 



1694. opaceles. 



l>~b. Thorax not longer than wide. 



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

 piceous black. 1695. plaxicollis. 



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

 and dense, arranged irregularly. 1696. parallelopipides. 



1693 (5374). Lyctus striates Melsh., Proc. Phil. Acad. Nat. Sen, 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 Yigo counties ; frequent. April 25-May 22. Bred 

 from stems of hickory. Probably occurs throughout the State. 



* Ann. X. Y. Acad. Sci., VI, 1891, 12. 



