82 PROC. ENT. SOC. WASH., VOL. 20, NO. 4, APR., 1918 



poorly defined; anterior ocellus in a triangular shaped depression; ver- 

 tical furrows sharply defined anteriorly; postocellar line distinctly longer 

 than the ocellocular line, but one-half shorter than the ocelloccipital 

 line; prescutum parted by a median longitudinal depression which i*s 

 especially prominent anteriorly; the suture between the scutellum and 

 the scutum deep, broad, and U-shaped; third abscissa of the radius dis- 

 tinctly greater than the first and second combined; the submedius and 

 anal veins united for a distance as great as the first anal cell. Shining 

 blue black; head and thorax with short white hair; first five abdominal 

 segments rufous; wings subhyaline, venation dark brown. 



Male. Length 5.5 mm. Anterior margin of the clypeus with deep 

 arcuate emargination; head and body- characters as described from the 

 female; except that the submedius and the anal veins are not united for 

 such a great distance; hypopygidium rounded apically. Blue black, 

 shining; head and thorax with short gray hair; the legs beyond the fe- 

 mora rufo-ferruginous; abdomen rufous except the apieal three tergites 

 and the hypopygidium; wings subhyaline, venation dark brown. 



Type-locality. Siskiyou, Oregon. Described from one male 

 and one female reared from larvae collected feeding in the cones 

 of Libocedrus decurrens, and recorded under Bureau of Entomology 

 No. Hopk. U. S. 14206 a. Material collected and reared by P. 

 D. Sergent. 



Type. Cat. No. 21706, U. S. Nat. Mus. 



Genus Diprion Schrank. 



The middle European species of the genus Diprion have re- 

 cently been tabulated by Enslin. In this tabulation two new 

 subgenera are established. As restricted in the present paper 

 the genus Diprion is confined (except for the recently introduced 

 D. simile Hartig) to the Palaearctic region, where it includes all 

 but one of the species of the subfamily. 



The subgenera recognized by Enslin may be separated as 

 follows: 



Key to the Subgenera of Diprion Schrank. 



1. Tarsal claws simple; antennae as in Diprion s. s. .Microdiprion Enslin 

 Tarsal claws with an inner tooth .2 



2. Antennae of female distinctly tapering, not serrate above, the 



third joint longer than the fourth, the fourth with a projection; 

 antennae of male not more than twenty-six-jointed and biru- 



inose to apex ,. Diprian Schrank 



Antennae of female not tapering, serrate above .and below, the 

 third and fourth joints subequal, ring-like and without projec- 

 tions; antennae of male thirty-two-jointed, the apical six joints 

 with only one ramus Macrodiprion Enslin 



