24 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, 82 



length but increase in width towards the chib. All the joints bear 

 numerous punctures and hairs except the second which has neither. 

 The club (fig. 8, A, C) is from 1.21 to 1.35 times as long as wide, 

 egg-shaped in outline, widest near the apex and strongly compressed. 

 Two nearly continuous septate sutures divide the club into three 

 joints. The first and third joints are nearly equal in length; the 

 second is distinctly shorter. The septae are arcuate and distinctly 

 visible from the externo-lateral aspect (fig. 8, B, C). On the interno- 

 lateral side (fig. 8, A, D) they are indicated by single sutures. Each 

 of the joints is covered by numerous hairs and punctures. Externo- 

 laterally these are closely placed and arranged in arcuate rows ; interno- 

 laterally, they are sparse, and the punctures are more numerous. 



The females (fig. 8, A) bear, moreover, on the interno-anterior 

 margin of the club a few very long hairs. The anterior setae of the 

 third, fourth, and fifth joints of the funicle are longer in this sex. 

 These are the only external characters by which the sexes may be 

 distinguished when the elytra are kept in the closed position. 



Specific modifications : — 



A — -Septae in the form of continuous bands of equal width through- 

 out, slightly less pronounced medially; externo-lateral side 

 of the club with minute, transverse wrinkles and small 

 punctures producing a slightly roughened surface (fig. 8, 

 A, B). 



Gn. rctusHs Lee. 

 AA — Septae wider laterally, indistinct and narrow medially ; externo- 

 lateral side of the club smooth or with very minute, sparse 

 wrinkles ; club stouter. 



B — Externo-lateral side of the club smooth, interno-lateral 

 side with numerous hairs and punctures (fig. 8, C). 



Gn. sulcatus Lee. 

 BB — Externo-lateral side of the club with minute wrinkles, 

 interno-lateral side with very few hairs and few 

 ])unctures ; club very stout. 



Gn. niafcriariiis Fitch. 



THE MOUTHPARTS 



The mouthparts present generic as well as specific characters. They 

 include the mandibles, the first maxilla and the second maxillae or 

 labium. 



