THE GENUS PISSODES. 



15 



The form and relative proportions of the maxillse. are shown in 

 figure 1, C, D, and in place in A. The cardo is short and stout, and 

 articulates with the hypostomal apodeme. The extensor, flexor, and 

 other muscles of the cardo, maxilla, and labium are attached to the 



aleral impression 



Fig. 3.—Dendroctonus valens: Head, dorsal and lateral aspects. A , Dorsal aspect of head; B, lateral aspect 

 of head; C, dorsal aspect of right mandible; D, ventral aspect of right mandible; a, dorsal area; b, dorsal 

 impression; c, anterior condyle; d, median fossa; e, median condyle; /, posterior fossa; g, basal ridge; ft, 

 apical tooth; i, acute margin; j, subapical tooth; fc, median tooth; 1, molar; m, anterior condyle; n, 

 median fossa; o, posterior condyle; p, lateral area; r, dorsal bristles of mandible; s, lateral bristles of 

 mandible; t, epistomal bristles; u, lateral angle of epistoma. (Author's illustration.) 



inner ventral wall of the beak in a median triangular space between 

 the hypostomal punctures and converging to a point near the anterior 

 limit of the pregula. The stipes is clearly defined as a subbasal piece 

 articulating with the cardo and joined to the palpifer and subgalea 



