Vol. 1] Timherl^ike. — New Genera and Species of Encyrtinae 355 



Length, 0.5-0.6 mm. with head held vertically, 0.6-0.7 mm. with 

 head extended horizontally, exclusive of ovipositor. 



MALE 



Colored like the female, except that the yellow is decidedly 

 more of a chrome orange tint especially on the abdomen. Length, 

 0.4-0.46 mm. with the head vertical, 0.49-0.55 mm. with head 

 horizontal. 



Described from eight females, two males (type, allotype and 

 paratypes a to /; ) reared from Pscudococcus timherlakei Cock- 

 erell, November 1-3, 1915, Millbrae (in salt marsh), California 

 (P. H. Timberlake), Salt Lake Laboratory no. 1830 A. 



Pseudococcobius Timberlake 



This genus recently characterized (Proc. U. S. Nat. Mus., 

 vol. 50, p. 563, May, 1916) appears on further study of the geno- 

 type and the additional species described below much more closely 

 allied to ApJnjcus than was at first supposed, and the discovery 

 of a few more species might well bridge the relatively slight gap 

 between the two groups. The species belonging here are prob- 

 ably all parasitic in mealybugs, and the differences separating 

 them from Aplnjeus appear to be an adaptation to their soft- 

 bodied hosts. The abdominal character used in my recent paper 

 on Aplnjcus to separate the two groups proves to be unreliable, 

 as I have discovered since that the fifth sternite often reaches 

 to the apex of the abdomen even in Aplnjeiis, although there is 

 no marked tendency towards compression of the abdomen as seen 

 in Pseudococcohuis. The mandibles, however, so far as they 

 have been studied carefully, always have acute teeth in Pseud o- 

 coccohius and blunt teeth in Aphycus, but otherwise do not differ 

 much. The antennal club of P. terryi is not actually solid, as 

 stated in my paper, but composed of three closely fused joints, 

 as a study of fresh material proves, although it seems nearly 

 if not quite impossible to distinguish them under ordinary cir- 

 cumstances. 



ApJrycus oxacae Howard belongs in the Pseudococcohius 

 group, as a reexamination of the type discloses the fact that the 

 mandibular teeth are acute. This species is similar to P. fumi- 

 pen)iis, described below, in type of coloration but is quite distinct. 



Pseudococcohius ehrlwrni is not congeneric wath terryi, as 

 the mandibles are distinctly bidentate and considerably more 

 narrow^ed toward the apex. The antennae also are considerably 



