THE GENUS DENDROCTONUS. 73 



SYNOPSIS OF SECONDARY SEXUAL CHARACTERS. 



DIVISION 1. 



F<-ni'jli's: Anterior pronotal area with transverse ridge Subdivision A. 



V.s-. Anterior pronotal area without transverse ridge Subdivision B. 



SUBDIVISION A. 



Females: With transverse ridge across the anterior area; elytral declivity slightly 



smoother, more shining, and less rugose Species 1 to 8, inclusive. 



MuL:*: \Vithout transverse ridge across the anterior area, but with broad impression. 



Species 1 to 8, inclusive. 

 SUBDIVISION B. 



Females: Elytral declivity with interspaces more shining, rugosities less prominent. 



Species 9 to 11, inclusive. 

 Males: Elytral declivity with interspaces more opaque, rugosities more prominent. 



Species 9 to 11, incluoive. 

 DIVISION II. 



Elytral declivity with distinct sexual characters in both sexes Subdivision C. 



Elytral declivity without distinct sexual characters in either sex Subdivision D. 



SUBDIVISION C. 



Females: Interspaces of elytral declivity rugose. Males: Interspaces of elytral 



declivity smooth. 

 Striae of elytral declivity impressed; interspaces convex in both sexes. 



Section a3, Species 12 and 13. 

 Striae of elytral declivity not impressed; interspaces flat Section a4. 



Section a4. 



lies: Striae of elytral declivity slightly impressed; interspaces subconvex. 



Species 14 to 21, inclusive. 

 Striae of elytral declivity not impressed; interspaces flat. 



Species 14 to 17, inclusive. 



?: Striae of elytral declivity slightly impressed; interspaces subconvex, but 

 smoother than in female Species 18 to 21, inclusive. 



SUBDIVISION D. 



Females: Head with front moderately broad; mandibles shining, moderately stout; 



antennal club broader Species 22 and 23. 



Males: Head with front broad; mandibles opaque, stout; antennal club narrow, more 



elongate and less compressed Species 22 and 23. 



SYNOPSIS OF PUPAL CHARACTERS. 



Vertex of head distinctly to faintly grooved, and with two small or prominent frontal 

 spines on or toward the vertex each side of groove Division I. 



Vertex of head faintly impressed, flat or convex, and with two small, widely separated 

 frontal granules toward vertex Division II. 



DIVISION I. 



Frontal spines small; elytral pads smooth; abdominal tergites 2 to 6 with or without 

 small pleural spines Subdivision A. 



Frontal spines large, prominent; elytral pads rugose; abdominal tergites 2 to 6 with 

 prominent pleural spines Subdivision B. 



