NO. 10 MORPHOLOGY OF GNATHOTRICHUS — SCHEDL 15 



C. Giiatliotriclius sulcattts Lee. 



Cryphdns sidcatus Leconte, 1868. 

 Pityophthorus s ill cat us Leconte, 1876. 



Common Names 



A. Gn. uiafcriarius Fitch. 



Pine timber-beetle (Fitch). 



Timber-beetle (Hopkins, 1893). 



Eastern pine wood stainer (Hopkins, 1904, Felt, 1906). 



B. Gn. rctusus Lee. 



Timber-ljeetle (Hopkins, 1893, Swaine, 1914). 

 Pine hole borer (Swaine, 1914). 



C. Gn. sulcafus Lcc. 



Western hemlock wood stainer (Hopkins, 1904). 



The Chitinous Skeleton of the Adult 



GENERAL APPEARANCE, VESTITURE, COLOR, AND SIZE 



The general form of all three species is slender in both sexes, 

 cylindrical, with the head concealed from above by the pronotum. The 

 pronotum is longer than wide with the sides parallel on more than 

 the caudal half and broadly rounded in front. The elytra are slightly 

 narrower or as wide as the pronotum, subparallel as far as the origin 

 of the declivity, sometimes slightly tapering posteriorly; moderately 

 broadly rounded behind. 



Length and relative proportions. (Dorsal aspect). — 

 Gnatliotrichus matcriarius Fitch. 



Length of the body (elytra and pronotum ; head concealed 



from above), 3.06 mm. 

 The body is 3.1 1 times as long as the width of the pronotum. 

 Width of pronotum, 0.98 mm. 

 The elytra are 1.46 times as long as the pronotum. 

 Examined specimens, 12. 

 Gnatliotrichus retusus Lee. 

 Length, 3.72 mm. 



The body is 3.23 times as long as the width of the pronotum. 

 Width of the pronotum, 1.15 mm. 

 The elytra are 1.54 times as long as the pronotum. 

 Examined specimens, 10. 



