16 



THE SCOLYTID BEETLES. 



sutures. The relative concavity or convexity of the anterior face, 

 as well as the relative lengths of the segments on the opposite faces, 



Palpifer-. 



Mentum - 



Giilar suture 



Occipital area 



Fig. 8. — Pissodesstrobi: Head, ventral aspect, and mouthparts. ^.Ventral aspect of apical region of beak; 

 B, ventral aspect of head; C, intcrno-lateral aspect of maxilla; D, externo-lateral aspect of maxilla; a, 

 apical tooth; 6, subapical tooth; c, lateral arm of hypostoma; d, pleurostoma; e, mandibular scrobe;/, 

 hypostomal area; </, lacinial bristles; Ji, antennal groove; i, joints; j, cardo fossa; k, hypostomal puncture. 

 (Original.) 



contour of the suture, etc., are shown m figures 11 to 13, but often 

 appear different in dried specimens. The articulatory attachment 



