100 



THE SCOLYTID BEETLES. 



subconvex; striae distinct, slightly impressed, and the interspaces 

 more distinctly rugose than in female. 



Typical male labeled, name label, "Hopk. 1/16/08, type of draw- 

 ing, Pinus, Michoacan, Mexico, A. L. Herrera, collector, $ , Hopk. 

 U. S. 2896a." 



Variations. Length from 5 to 6.1 mm., average about 5.5 mm.; 

 color, dark brown to black, with the usual variation in epistoma, pro- 

 notal punctures, pubescence, and median line. 



Distinctive characters. This species is distinguished from D. 

 approximates by the noticeably less shining and more pubescent pro- 



notum, the deeper punctures, the 

 noticeably and constantly less im- 

 pressed elytral striae, and the less 

 distinct punctures. 



Revisional notes. Agrees with 

 original description, except that 

 the specimens before the writer are 

 smaller, the type being given as 6 

 mm. The median line is flat in all 

 but one specimen, in which it is im- 

 pressed toward the anterior and 

 posterior margin. In Blandford's 

 revision the length of the type is 

 given as 6.3 mm. Blandford states 

 that it differs from D. approxima- 

 tus Dietz by its smaller size, more 

 elongate shape, more shining and 

 strongly punctured prothorax, and 

 indistinct elytral striae. The last dif- 

 ference holds, but the others do not. 

 In the writer's reference to this 

 species (1905a, p. 81) it was con- 

 sidered to be the same as D. approximatus Dietz, but I am now con- 

 vinced that the two are specifically distinct. 

 The pupae and larvae have not been observed. 

 Galleries (fig. 61). A short section of the egg gallery, from which 

 an adult was taken, indicates that it is quite similar, in its winding 

 character and the absence of exposed larval mines, to that of D. 

 approximatus. 



Distribution (fig. 62). Recorded from Mexico by Chapuis (1869) 

 and Blandford (1897). Specimens were received with D. mexicanus 

 from Prof. A. L. Herrera, labeled Mexico and Michoacan, Mexico, 

 with his statement that it destroys the forests of lonacatapec, Morelos, 

 and many regions of Mexico. 



FIG. 61. Dendroctonus parallelocollis: Section of 

 egg gallery. (Original.) 



