364 SCOLYTID^. 



[LeConte, 



The dimensions and relations of these teeth -with each other, and tlie 

 arrangement of the sutures of the antennal club give excellent characters 

 for the discrimination of the species ; and I hope that the student will have 

 no difficulty in recognizing those I liave admitted in this memoir. The 

 descriptions of those named by Mr. Eichhoif are, however, too indefinite 

 for me to venture to pronounce with certainty upon their affinities ; they 

 seem, moreover, if I may judge from the short diagnoses, to have been 

 unduly multiplied upon individual ditierences of slight importance. 



2. T. cacographus Lee, Tr. Am. Ent. Soc. 1868, 162; Bostrichus 

 piniX Zimm. (nee Say), ibid, 147. 



Southern and Western States. Similar to the preceding, but usually of 

 smaller size, (3.5-4 mm.; .14-.16 inch); the cusp of the second interspace 

 is very small, and that of the third is wanting ; that of the fifth is com- 

 pressed and scarcely more prominent than that of the fourth interspace 

 ^ind is somewhat connected with it : there are but two teeth between 

 the tooth of the tiftli interspace and the terminal acutely elevated margin, 

 and these teeth are all of them less prominent than in T. calligraphus, in 

 some specimens (^j^), but equally prominent in others, 9> those less acute 

 than in T. caligraphus. The interspaces from the third outward are 

 marked each with a regular series of punctures behind the middle, whereby 

 it differs from the next species. The club of the antennas is quite similar to 

 that of T. calligraphus. 



3. T. confusiis, n. sp. 



Quite like T. cacographus, except that the elytral strite are composed of 

 larger and more transverse punctures ; the punctures of the interspaces are 

 very distant as far as the middle, but become irregular and confused with 

 the stripe behind. The teeth on the margin of the declivity are arranged 

 just as in T. cacographus, but are larger and stouter, and the one of the 

 fifth interspace has a tendency to become curved at the end. The club 

 of the antenn* as in the two preceding species. Length 4 mm. ; .16 inch. 



Southern California and Arizona. I have seen but three specimens. 



4. T. plastographus Lcc, Tr. Am. Ent. Soc. 1868, 163. 



Middle California and Xew Mexico ; two specimens. This species closely 

 resembles T. confusus in the sculpture of the elytra, the interstrial punc- 

 tures being confused behind, but on the inner interspaces from the third to 

 the fifth there are no punctures except near the declivity. The tooth of the 

 fourth intei'space is more compressed and closely united with the very 

 prominent tooth of the fifth interspace, which is cylindrical and obtuse ; 

 there is but one tooth between that of the fifth interspace and the apical 

 elevated margin, but this is large and conical. The sutures of the antennal 

 club are very strongly angulated. Length 4.5 mm. ; .18. 



5. T. emarginatus, n. sp. 



Cylindrical, shining, blackish piceous, sparsel}' clothed with long yel- 

 lowish hairs. Head granulated, with two small frontal elevations, the 

 anterior one near the margin, which is fringed as usual with short j^ellow 



