574 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 50. 



Coloration the same, except that the sides of the abdomen behind 

 the vibrissal plates are yellowish, and the antennal scape blackish, 

 paler at base, pedicel paler blown, first two funicle joints and most of 

 club white, rest of funicle and extreme base of club black. Wings 

 nearly hyaline. Length: 0.65 to 0.8 mm. 



Material as follows has been examined: Three females, (cotypes) 

 reared from Pseudococcus sp. on passion-flower in summer of 1886 

 (A. Koebele), three females reared from Pseudococcus sp., Nov. 9, 

 1907, Los Angeles, California (E. M. Ehrhorn), two females, two males 

 reared from Pseudococcus ryani (Coquillett), Pasadena, California, 

 the females July 28-30, 1911, the males some time later (P. H. Tim- 

 berlake), one male reared from Pseudococcus sp. on Artemisia cali- 

 fornica, Nov. 22, 1912, Whittier, California (P. H. Timberlake), one 

 female reared from Pseudococcus citropJiilus Clausen, Sept. 1, 1914, 

 Uplands, California (C. P. Clausen) , and a series of both sexes reared 

 from Pseudococcus longispinus (Targioni Tozzetti) during the latter 

 part of Sept., 1914, Pasadena, California (R. S. Woglum). 



Type.Csit. No. 5044, U.S.N.M. 



Genus ACEROPHAGUS Emily A. Smith. 



Acerophagus SMITH, North Amer. Entom., vol. 1, 1880, p. 83. 

 Rhopoideus HOWARD, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 235. 



Comes nearest to Pseudaphycus, but the shorter, more robust body, 

 the broader head, as well as differences in the dentition of the mandi- 

 bles will separate the known species. 



Female. Head as seen from the side imperfectly triangular, moder- 

 ately thick antereo-posteriorly, dorsal aspect gently rounded, passing 

 into face by a rounded angulation; face and cheeks moderate in length, 

 the former a little longer than the transverse diameter of eyes, as seen 

 from in front the head, therefore about as wide as long, nearly circu- 

 lar in outline; antennal scrobes moderately deep, extending nearly 

 the length of face and uniting above; eyes rather small, oval or a little 

 wider anteriorly, frequently pubescent, the long axis obliquely ver- 

 tical; occiput rather deeply concave, the neck inserted near the 

 middle; front and vertex usually broad, the ocelli more frequently 

 arranged in a right or obtuse-angled triangle, the posterior pair about 

 twice their own diameter from the occipital rim. Mandibles rather 

 long and slender, tridentate, the two upper teeth subequal, the lower 

 tooth smaller and more basal. Antennae inserted near the mouth, 

 their bases far apart, scape moderate in length, slender and flattened, 

 reaching but little beyond the plane of front and vertex; pedicel 

 about as long as the first three funicle joints; funicle 5-jointed, all the 

 joints short, increasingly transverse; club oval, about as long as the 

 funicle. Thorax short and robust, the mesoscutum twice as wide as 

 long, the axillae meeting, scutellum nearly as wide as long, its apex 



