SCOLYTID^. [income. 



punctured and finely rugose, opaque; posterior margin of third and fourth 

 segments thickened, the former with two distant conical elevations. 



South Carolina, Florida and Texas, extending into Mexico. Length 5.2 

 -3.7 mm.; .21-. 23 inch. 



2. P. quadridentatus. Scolytusquadr. Oliv., 78.5; pi. l,f. 3: Lee. apud 

 Chapuis, Mon. Plat, 338, (err. cler.): P. BlanchardiCbap., Mon. 185, f. 96. 



9 . Elytra deeply striate, with a posterior process at the end of the third 

 interspace, and a large compressed obius^ly truncate one at the junction of 

 the fifth and eighth interspaces: ventral surface opaque, densely punctured; 

 fourth segment with two acute spines near the hind margin. 



(j\ Unknown. 



Florida: length 4 mm.; .16 inch; occurs also in Texas, according to Mr. 

 Chapuis, if I am correct in considering his species as the same. 



3. P. compositus Say, Journ. Ac. Nat. Sc. Phila., iii, 324 (9); ed. 

 Lee. ii, 182; Er.,Wiegm. Arch. 1836, ii, 65; Chapuis, Mon. Plat. 163, f. 75, 

 tf. 9 ; P. parallelus Chap., ibid. 164, f. 76, tf, 9 ;? Bostriehus par. Fabr., 

 Syst. El. ii, 384, (description of no value); ?. P. tremiferus Chap., Mon. 

 Plat. 174, f. 85, <f, 9 ; ? P. perfotsus Chap., ibid. 176, f. 86, $, 9 ; ? P. 

 rugosus Chap., ibid. 176, f. 87, tf, 9. 



(3\ Apical part of front smooth; prothorax scarcely punctulate; elytra 

 transversely impressed near the tip, without posterior process. Ventral 

 segments shining, sparsely punctulate. 



9 . Front uniformly rugose; prothorax distinctly punctulate; elytra with 

 tha second interspace compressed and forming an acute cusp near the tip; 

 fifth and ninth interspace prolonged into a large process, which is concave 

 above, and tridentate at tip; the outer tooth much longer, narrow and trun- 

 cate rr emarginate at tip according to age of specimen, or direction of view. 

 Ventral segments opaque, densely punctured; fifth flat, not carinate, nor 

 tuberculate. 



Illinois to Texas, Louisiana, Florida, South Carolina. Neither the figures 

 nor descriptions of Dr. Chapuis indicate anything more, in my opinion, 

 than slight individual varia ions of form and sculpture, such as I would be 

 unwilling to admit as having specific value. Nevertheless, as I have not 

 seen the typical specimens, I cannot be certain of the correctness of this 

 view. The original description of Fabricius refers to a male of this or 

 some allied species, but is quite irrecognizable, and should not take prece- 

 dence over the well-defined characters published by Say. Length 4 mm. ; 

 .16 inch. 



4. P. rugulosus Chap., Mon. Plat. 192, f. 103, tf, 9. 



<3\ Front entirely opaque, finely rugose; prothorax feebly punctulate; 

 elytra finely not deeply striate, transversely impressed at tip, without sub- 

 apical process. Ventral segments shining, sparsely and finely punctured. 



9- Front entirely opaque, densely rugosely punctured (areolate in fact); 

 prothorax unequally punctulate and punctured, less finely at the sides; ely- 



