OF WASHINGTON. 37 



equals description of 9 ' in a ll respects except the 

 head, which has the front convex, smooth, sub-opaque, faintly punctured 

 and with faint median line; epistoma clothed with long hairs, extending 

 over base of mandibles. 



\ 



The characters here defined vary but slightly in the other exam 

 ples before me. The ^^ are generally smaller and vary more in 

 size. When exposed the posterior portion of the head is found 

 to be sub-opaque and punctured to vertex. The elytral striae and 

 interspaces are slightly more distinct in some examples than in 

 others. 



Systematic Position of the Genus. 



This genus seems to represent a distinct group coming between 

 Blandford's groups Scolytides and Hex^colides. These three 

 groups may be distinguished as follows : \\J 



A. "Anterior tibiae produced at the upper apical angle beyond the tar- 

 sal insertion into a mucro, or bifid process " (Blandford); upper border 

 unarmed. Third joint of tarsi bilobed. 



SCOLYTIDES. 

 (Scolyti.) 

 (Comptoceri.) 

 (Bothrosterni). 



B. Anterior tibiae strongly produced at the upper apical angle into an 

 upward curved process; upper border armed. Third joint of tarsi not 

 bilobed. 



ERINEOPHILIDES. 

 (Erineophili.) 



C. "Anterior tibiae not produced beyond the tarsal insertion" (Bland.) 



HEXACOLIDES. 

 HYLESINIDES. 

 TOMICIDES. 



* Detailed measurements and ratios. 



1. 9 9 9 average 1.66 mm. Maximum 1.75. Minimum 1.50. 



2. 5 $$ average 1.53 mm. Maximum 1.65. Minimum 1.30. 

 i. 999- Mean ratio of length of prothorax to width, 94%. 

 Mean ratio of length of prothorax to length of elytra, 59%. 



Mean ratio of width of elyUra to length of elytra, 69%: mean 74 (ex 

 presses specific value of composite character.) 



2 - 5 d*cT- Mean ratio of length of prothorax to width, 95%. 



Mean ratio of length of prothorax to length of elytra, 58%. 



Mean ratio of width of elytra to its length, 69%; mean 74 (expresses 

 specific value of composite character.) 



