350 SCOLYTID.^. 



[l.eCoiit€. 



tures deep, sUglitly cuvved. Hairs of the body slender, n )t verlicellate nor 

 serrate; elytra feebly punc^u.-ed; pr.)tliorax asperate in front, nearly smoot!i 

 behind. Fifth ventral segment broadly rounded behind, pygidium but 

 slightly visible from beneath; Gnathotrichus Eichhoft'. 



1. Posterior declivity of elytra not retiise 2. 



" " " retuse, concave near the 

 suture 1. retusus. 



2. Prothorax moderately rough in front 2. materiarius. 



" very rough in front, size much smaller. . 3. asperulus. 



1. P. retusus. Cryphnlusret. Lee, Trans. Am. Ent. Soc. 18G8, 155, ( 9 ]'< 

 C. sxdcatus Lee, ibid. 155, (^. 



(^. Front finely and convergently striate; posterior callosity of the elj-'.ra 

 less prominent. 



9. Head s'.iining, sparsely and strongly punctured; posterior callosity of 

 elytra more prominent. 



California, Oregon and Vancouver Island. Length 3.5 mm.; .14 inch. 



2. P. materiarius. Tom'cus mat. Fi ch, "N". York Reports on noxious 

 In.sects, iv, p. 41, No. 246; Crypturgux mat. Zimm., Trans. Am. Ent. Soc. 

 1838, 143; Onathotrichustcorthyloldes'EAchXwQ, Berl. Ent. Zeitschr. 1868,275. 



9 . Head shining, sparsely but strongly punctured. 



(^. Unknown to me. 



Canada to Texas. Length 2.5 mm.; .10 inch. Infests pine timber. The 

 galleries as figured by Dr. Fitch, are remarkable for the branches being 

 sliort, parallel, and at right angles to the main gallerj'. He also observes, 

 what is probably true of all the species which mine into the wo ,d, instead 

 of siniply under the bark, that the females are vastly more numerous than 

 the males. 



3. P. asperulus, Cryplialus asp. Lee, Trans. Am. Ent. Soc, 1868, 155. 

 Virginia, Mr. E. T. Cresson; one female; the head is retracied, but so far 



as I can see seems to be flat, and punctured as in the preceding. Length 

 1.0 mm.; .06 inch. 



B. Club of antennae distinctly annulated and pubescent on both sides, not 

 fringed with long hair. Hairs of the body stout or slender, not verticellate 

 nor serrate. Prothorax asperate in front, finely punctulate behind. Elytra 

 punctulate and pubescent. Front tibits moderately serrate, front tarsi witli 

 joints 1-3 stout; fifth longer than the others united. Pygidium scarcely 

 visible from beneath. 



Elytra scarcely punctulate; hairs stout, short 4. minutissiraus. 



Elytra finely punctula'e; hairs longer, and short, in- 

 termixed 5. pubipennis. 



Brown, shining, moi-e slender, more strongly punc- 

 tulate, hnirs s; arse, fin*; 6. pilosulus. 



