106 THE SCOLYTID BEETLES. 



The greatest variation is in size and in the presence or absence of 

 dorsal Hne of the pronotum. 



Distinctive characters. — The characters which distinguish this spe- 

 cies from the next following, to which it is more closely allied, are 

 the average smaller size and prevailing moderately impressed elytral 

 striae with distinct but moderately coarse punctures. "Wliile the strial 

 punctures vary in size in different individuals, they are never so coarse 

 as in the average D. ponderosx. It is also distinguished from 

 D. jeffreyi by the much smaller average length of body and the pre- 

 vailingly coarser punctures of the pronotum. 



Revisional notes. — A brief description (Hopkins, 1905, p. 11) was 

 published under the name D. monticola, but the name should read 

 D. monticolse, which, as the manuscript name indicates, was origi- 

 nally intended. The species is represented by three specimens from 

 California in the Le Conte collection, with the type series, under 

 D. similis, bearing specimen numbers 4, 12, and 13, and therefore 

 may have been included in the revision by Le Conte (1876, p. 385), 

 although the locality (California) is not given in that correction. 

 There is also one specimen in the Horn collection, labeled "Cal.," 

 under D. similis. It is probable that the one under similis was before 

 Dietz when he prepared his revision (1890, pp. 30-31) under the name 

 similis. These specimens are evidently the only ones which may have 

 been involved in Le Conte's or Dietz's revisions on the literature pre- 

 vious to Hopkins, 1899b, pp. 14 and 26. 



Pupa. — In addition to the generic, divisional, and subdivisional 

 characters, the apex of the front and middle femora is armed with 

 two small apical spines; abdominal tergites 2 to 6 with long and prom- 

 inent pleural spines, 1 is without distinct dorsal and lateral spines, but 

 2 to 6 have distinct dorsal and lateral ones, 2, 3, and 6 with a pair, 

 and 4 and 5 with three lateral spines each side of the dorsal ones; 

 7 has two dorsal spines, while 8 is smooth and the pleural spines of 9 

 are long and prominent. Pupal tjrpe labeled "Hopk. U. S. No. 196." 



There is the usual variation in the arrangement and number of 

 minor spines, and one specimen from Yosemite National Park is quite 

 different in the widely separated frontal spines, with the dorsal ones 

 of the abdominal tergites coarser and tergite 7 with a pleural spine. 

 It is possible that this may be a pupa of an unrecognized species. 

 The characters of the pupa of D. monticolse, which serve to distinguish 

 it from that of D. ponderosse, are the less coarse spines of the abdom- 

 inal segments, the less densely granulated elytral pads, and the pres- 

 ence of two apical spines on the front and middle femora. 



Larva. — In addition to the generic and divisional characters, the 

 front has the posterior angle subacute and a moderately stout, rugose 

 elevation situated in the middle, becoming slightly thickened and 

 elevated toward the suture. Clypeus shining, with faint median 



