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, 



Palpi 



Palpifer.., 

 Mentum 



Occipital 



FIG. S.Pissodesstrobi: Head, vent nil aspect, and mouthparts. A, Ventral aspect of apical region of beak; 

 B, ventral aspect of head; r, iult rno-latcral aspect of maxilla; Z>, externo-lateral asp* ct of maxilla; a, 

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

 hypostomal area; g, lacinial bristles; h, antennal groove; i, joints; j, cardo fossa; k, hypostomal puncture. 

 (Original.) 



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

 appear different in dried specimens. The articulatory attachment 



