NO. 2136. REVISION OF THE GENUS APHYCU8—TIMBERLAKE. 563 



7. Body elongate; abdomen mncli 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 Aphycus Mayr. 



PSEUDOCOCCOBIUS/ new genus. 



In general facies much resembles Apliycus 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 

 varymg considerably m width. Mandibles rather long, tridentate, 

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

 Antemial scape flattened, linear or nearly so or cylmdrical, reaching 

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

 as the first tlu*ee or four funicle joints combined; funicle as a whole 

 short, mcreasing 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 Aphycus, 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 - reaching 

 to the anus and inclosing base of the ovipositor; tlie 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° w^ith the margin of 

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

 reduced or weak; hind v/ing narrow, the costal coll very narrow but 

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

 not differing from Aphycus. 



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



Type of genus. — Apliycus terryi Fullaway. 



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

 the genera Pseudococcus and Phenacoccus so far as known. 



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



2 The so-called hvpopygium of authors and the val vu!a ventralis of Thomson is morphologically, I believe, 

 apart of the seventh abdominal segment, as the propodoum seems really composed of the first two abdomi- 

 nal segments in the Encyrtidae. 



