KEY TO THE LONG-HORNS. 



9. Elytra with a conspicuous space on the apical half 

 which is not pubescent 10. 



Elytra without a conspicuous bare space on the apical 

 half; nearly an inch long 12. 



10. Length about an inch .' 1 1. 



Length about .5 in.; brown; head, pronotum, and last 



third of elytra with reddish-yellow pubescence, basal part 

 of elytra mottled with grayish pubescence. Breeds in 

 oak, probably also in chestnut and hickory. . .Goes debilis. 



11. Pubescence white. Breeds in hickory, oak, and 

 possibly other trees Goes tigrina. 



Pubescence dark brown, silvery, and reddish-yellow; 

 there is a broad, transverse, lighter band across the 

 elytra and the tips of these have golden pubescence. 

 Breeds in hickory. . Goes pulchra. 



12. General pubescence brownish; elytra with small 

 spots of yellowish hairs arranged in irregular rows. Breeds 

 ak Goes tesselata. 



General pubescence grayish or whitish; elytra in- 

 distinctly crossbarred at base, and again behind the 

 middle, with pale-brown pubescence; scutellum sometimes 

 clay-yellow. Apparently breeds in elm, ironwood, beech, 

 and oak Goes pulverulenta. 



Acanthoderini. (See page 353.) 



1. Basal joint of antennae club-shaped; pronotum with 

 dorsal tubercles and a large, acute spine near the middle 

 of each side; about .5 in. long 2. 



Basal joint of antennas cylindrical; spines on sides of 

 pronotum, if present, behind the middle 3. 



2. Dark brown, with yellowish-brown pubescence; each 

 elytron with a large, wavy, white crossbar near the middle 

 and a row of small alternate brown and white spots along 

 the suture. Larvae live in oak, hickory, beech, and 

 hackberry Acanthoderes quadrigibbus. 



Dark brown, with yellowish and gray pubescence in 

 about equal proportions, the gray on elytra in three 

 obscure, oblique, nearly parallel bands; an indistinct, 

 M-shaped, black mark behind the middle of each elytron. 

 On poplar and hickory Acanthoderes decipiens. 



355 



