1916] 



Williams — New Species of Thripodenus 



55 



The following description contains certain characters of generic, 

 rather than specific value, which are included merely for conven- 

 ience in identifying specimens. 



Fig. 1. 1, Willow galls occupied by thrips; 2, Parasitized thrips containing 

 three larvae of Thripocfenus nubilipennis; 3, Thripodenus nuhilipennis 9 ; 

 4, Antenna of same, cf . 



Thripoctenus nubilipennis sp. nov. 



Female: Length, 0.7-0.9 mm. Antennae inserted just above 

 the clypeus, 7-jointed, the club of 3 segments and the funicle of 

 2, the latter shorter than the pedicel. Head as wide or slightly 

 wider than the thorax, seen from in front distinctly wider than 

 long. Clypeus with a distinct keel. Front broad, strongly con- 

 cave. Inner eye-margin with a row of bristles, the posterior one 

 long and conspicuous. Ocelli in a low triangle. Gense prominent. 



