508 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 58. 



thirds; second tergite short, transverse, longer mediall}^ than at the 

 sides, the apical margin being strongly arcuate, at least four timess 

 as broad at apex as long down the middle, slightly broader at apex 

 than at base, smooth and shining, like the remainder of the abdomen ; 

 hypopygium not extending beyond the apex of the last dorsal abdom- 

 inal segment ; ovipositor strongly decurved at tip, the sheaths about 

 as long as the abdomen. Black; antennae entirely black; tegulao 

 transparent-whitish ; wings whitish-hyaline, stigma and veins color- 

 less, only the outline of the stigma being brown ; all coxae and tro- 

 chanters, basal half of the middle femora and the hind femora en- 

 tirely, black; apex of the posterior tibiae and the posterior tarsi 

 mostly blackish ; remainder of the legs reddish-testaceous ; ovipositor 

 sheatlis black, 



Male. — Abdomen more slender, and the first tergite not distinctly 

 broader at apex than at base ; otherwise essentially as in the female. 



Cocoons. — White, solitary, and formed in the bolls. 



Type locality. — Stone Cabin Canyon, Santa Eita Mountains, Ari- 

 zona. 



Allotype locality. — Sabino Canyon, Arizona. 



Type.—C'At. No. 22516, U.S.N.M. 



Host. — Bollworm on Thurljeria thespesioides. 



Described from 18 female and 12 male specimens bred by W. D. 

 Pierce (one specimen, bred Aug. 15, 1913) ; A. W. INiorrill (two speci- 

 mens, bred Nov. 15, 1913) ; and C. H. T. Townsend (the remainder of 

 the specimens, bred during late August and earlv September, in 

 1917 and 1918). 



16. APANTELES MEGATHYMI Riley. 



Apantele.s ineyaUiymi Kii.ey, Ti-;iiis. Acad. Sei. St. Louis, vol. 4, pt. 2, 1881. 

 p. 304 ; iti Scudder, Butterflies U. S., 1889. p. 1903. 



Hahitat. — South Carolina. 



Host. — Megathymus yuccae Boisduval and LeConte (Riley). 



Known only from the large series of cotypes in the National Collec- 

 tion. The species is very close to thurheriae^ from which it can be 

 s' [)arated by the characters noted in the key ; furthermore megathymi 

 is gregarious, the cocoons being packed close together in the burrow 

 of its host, while tliurheriae is solitary. 



17. APANTELES HARTI Viercck. 



Apanteles harti Viekeck, Proc. Ent. Soc. Wash., vol. 11, 1910. p. 209. 



Hahitat. — District of Columbia. 

 Host. — Pyrausta penitalis Grote (Viereck). 

 Cocoons. — White, solitary. 



Known only from the type series in the United States National 

 Museum. 



