350 SCOLYTID^E. [LeConte. 



tures deep, s-iglitly curved. Hairs- of the body slender, n:>t verticellate nor 

 serrate; elytra feebly punctured; prothorax asperate in front, nearly smooth 

 behind. Fifth ventral segment broadly rounded behind, pygidium but 

 slightly visible from beneath ; GNATHOTRICHUS Eichhoft*. 



1. Posterior declivity of elytra not retuse 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.jretusus^CrypJialmret. Lee., Trans. Am. Ent. Soc. 1868, 155, ( 9 ) ; 

 C. sulcatus Lee., ibid. 155, <j\ 



(5\ Front finely and convergently striate; posterior callosity of the elytra 

 less prominent. 



9- Head shining, sparsely and strongly punctured; posterior callosity of 

 elytra more prominent. 



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



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

 Insects, iv, p. 41, No. 246; Crypturgus mat. Zimm., Trans. Am. Ent. Soc. 

 1868, 143; Gnathotrlchus corthyloides Eichhoff, 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 

 short, parallel, and at right angles to the main gallery. He also observes, 

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

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

 the males. 



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

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



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

 1.5 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 tibise moderately serrate, front tarsi with 

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

 visible from beneath. 



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



Elytra finely punctulate; hairs longer, and short, in- 

 termixed 5. pubipennis. 



Brown, shining, more slender, more strongly punc- 

 tulate, hairs s; arse, fine 6. pilosulus. 



