18 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



proximately one-fourth the length of scutellum ; scape, all coxae and 

 femora, fore and median tibiae, and all tarsi yellowish-white; hind 

 tibiae black with the apex pale; tarsal claws black; tegiilae and nar- 

 row margin of mesoscutum before tegulae pale ; wings hyaline, vena- 

 tion dark broAvn. 



Male. — Length 0.75 mm. Antennal club as long as pedicel and 

 first two joints of funicle combined; pedicel not longer than broad. 

 Head, thorax, and abdomen black; antennal fiagellum dark brown; 

 scape, and apex of postscutellum whitish; all coxae, basal half of 

 middle femora, basal two-thirds of hind femora, hind tibiae except 

 at apex and apical joint of all tarsi black or blackish; rest of legs 

 white; otherwise like the female. 



One male paratype has the front femora blackish at base and the 

 hind femora and tibiae entirely black. 



Type locality. — Ancon, Canal Zone. Panama. 



7'ype.— Cat.'No. 24989, U.S.N.M. 



Host. — Saissetia nigra Nietner. 



Three females and three males reared from th^ above named scale 

 insect by J. Zetek. 



It is possible that the above described males may be wrongly asso- 

 ciated with the females. Except in color they appear to agree nicely, 

 however, and since considerable antigeny in color characters is Imown 

 to exist in other species of this genus, they are believed to be the same 

 species. 



Subfamily Tetrastichinae. 



TETRASTICHUS FASCIATUS Ashmead. 



This species, of which the United States National Museum Col- 

 lection contains seven specimens from the type series, was origi- 

 nally described from collected specimens taken on the island of 

 St. Vincent, West Indies. In the same collection is a single speci- 

 men, determined by Mr. A. A. Girault as a variety of fasciatus, 

 which was reared from Contarinia sorghicola by P. J. Van Bree- 

 men at Curacao, Dutch Antilles. 



A series of twenty-four specimens of a Tetrastichus reared by 

 K. K. Kannan fron> Contarinia caudata Felt infesting sorghum at 

 Chumurajhagar, India, and sent under his lot No. 15, as well as a 

 smaller series consisting of eleven specimens reared by the same 

 collector from the same host at Chintaman, India, sent under his 

 lot No. 17 have been compared with the types and are believed 

 to be the same species. Structurally the Indian specimens appar- 

 ently agree in every detail with those from the West Indies. The 

 color is also the same, except that in the Indian specimens the head 

 and thorax are of a duller yellowish than in the tj'pes, appearing 

 more or less infuscated. This fuscous tinge is believed to be dis- 



