NO. 2136. REVISION OF THE GENUS APHYCUS TIMBERLAKE. 563 



7. Body elongate; abdomen much longer than wide, pointed at apex. 



Astymachus Howard. 



Body short, robust; abdomen ovate, rarely over one-half longer than wide; and 

 rather obtusely rounded at apex ApJiycus Mayr. 



PSEUDOCOCCOBIUS, 1 new genus. 



In general f acies much resembles Aphycus Mayr but differs espe- 

 cially in the dentition of the mandibles and the structure of the 

 abdomen. 



Female. Head seen from in front about as wide as the length of 

 the vertical axis, or a little wider in P. terryi; the front and vertex 

 moderately convex and pass over into the face by a rather sharp 

 angle but angle not at all carinate; face and cheeks short in genotype, 

 the antennal scrobes fairly deep ; eyes large, about four-fifths as wide 

 as long, or sometimes smaller and narrower, pubescent; ocelli placed 

 in an acute to a right-angled triangle (nearly equilateral in the 

 genotype), the posterior pair removed from the rim of the occiput 

 and about their own diameter or less from the eye margin; vertex 

 varying considerably in width. Mandibles rather long, tridentate, 

 with the middle tooth much longer and stouter than the others. 

 Antennal scape flattened, linear or nearly so or cylindrical, reaching 

 a little beyond the plane of front and vertex; pedicel about as long 

 as the first three or four funicle joints combined; funicle as a whole 

 short, increasing slightly in diameter distad, all the joints wider 

 than long; club large, in general shape oval, sometimes slightly 

 obliquely truncate, about as long as the funicle joints combined. 

 Thoracic structure nearly as in ApJiycus, but the mesoscutum shorter 

 and much wider than long; abdomen rather short, ovate, the dorsum 

 more or less concave after death, the fifth ventral sclerite 2 reaching 

 to the anus and inclosing base of the ovipositor; the latter protruded 

 and slender. Wings fully developed, the marginal vein punctiform, 

 the postmarginal short, hardly longer than the marginal, stigmal 

 rather short, forming an angle of about 60 to 70 with the margin of 

 wing, submarginal with the usual row of bristles tending to become 

 reduced or weak; hind wing narrow, the costal cell very narrow but 

 extending to the booklets. Sculpture, vestiture, and type of coloration 

 not differing from ApJiycus. 



Male. Closely resembles the female in all but the sexual characters. 



Type of genus. ApJiycus terryi Fullaway. 



The species belonging to this genus are parasitic in mealy bugs of 

 the genera Pseudococcus and PJienacoccus so far as known. 



1 From Pseudococcus, a genus of Coccidae, and 6Bios, referring to the host relationship. 



2 The so-called hypopygium of authors and the valvula ventralis of Thomson is morphologically, I believe, 

 a part of the seventh abdominal segment, as the propocleum seems really composed of the first two abdomi- 

 nal segments in the Encyrtidae, 



