296 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



32. Scolytus sp. (probably uadescribed). 



Dr. Hamilton states (Can. Bnt. xvii, 1885, p. 48) that Scolytus rugula- 

 tus breeds in hickory twigs, but Mr. Schwarz (Proc. Ent. Soc. Wash- 

 ington, i, No. 1, 30,) maintains that this species differs from 8. rugulosus^ 

 and is apparently undescribed. (J. B. Smith, Ent. Amer. ii, 127, 1886.) 



33. Sinoxylon basilare (Say). 



Order Colboptera ; family Ptinid^. 



This beetle in its larval state inhabits hickory wood, in which it 

 bores to a considerable depth, preferring the hard central wood. Its 

 borings are very fine, and firmly compressed. After fall development 

 is attained it makes its way out almost at a right angle and emerges 

 through a circular opening in the bark of the hickory. (Horn.) 



34. Red-shouldeued apate. 



Apate basillaris (Say). 

 Order Coleoptera ; family Scolytid^. 



Boring deep, small straight holes to the heart of the tree, which 

 is entirely killed by this insect, and transforming at the bottom of 

 the hole. 



The beetle. — Deep black, and punctured all over; thorax very 



convex and rough in front; the wing-covers not excavated at the 



tip, but sloping downward very suddenly behind, as if obliquely 



cut off, the outer edge of the cut portion armed with three little 



^ teeth on each wing-cover, and on the base or shoulders a large red 



Fi6. 119.— Apate 6a- , ^ „„.,.,,.„. . 



sillaris, Smith spot 0.20 inch in length. (Harris.) 



aud Marx del. 



35. The hickory bark-borer. 

 Chramesus icoriw Leconte. 



This bark-borer has been bred from the branches and twigs of the 

 hickory by Dr. Le Oonte. The genus belongs to a group of Scoly tidse 

 well defined by the club of the antennae being large, strongly compressed, 

 pubescent, and sensitive, the antennae themselves being inserted as 

 usual at the sides of the front. The tibiae are broad, obliquely rounded 

 at the end, and finely serrate. Chramesus, says Le Conte, differs from 

 Polygraphus in the eyes not being completely divided ; they are slightly 

 eraarginate, the funicle being attached at the side of the club, the 

 outer joints being slender. Two species (one not mentioned in Le 

 Conte and Horn's work on "Coleoptera of North America") live on 

 the species of Carya. 



Prof. John B. Smith (Ent. Amer. vi, 53) gives an account of the 

 habits of this Scolytid beetle, with a figure of the mine and of the mouth- 

 parts of the larva, which is also described in full. 



