346 PROCEEDIXGS OF THE NATIONAL MUSEUM vol. 94 



about as broad before as bej'ond the middle; posterior tibia slightly 

 compressed, not so broad as femur. Forewing with costal cell ciliated 

 throughout its whole length, the hairs in apical angle longer and more 

 numerous than in rest of cell; area behind submarginal vein nearly 

 uniformly ciliated except along the posterior margin; surface of wing 

 distad of point where submarginal vein begins to curve toward margin 

 uniformly ciliated ; marginal vein about twice as long as postmarginal 

 and a little over twice as long as stigmal. Abdomen nearly as long as 

 thorn X but narrower, parallel-sided, smooth at base above and weakly 

 sculptured elsewhere, with a very short, ringlike, and smooth petiole. 

 Originally described by Brues from a single female taken at 

 Brownsville, Tex., and deposited in the Brooklyn Museum but now 

 in the United Spates National Museum collection. Besides the type 

 the national collection now possesses 30 females and 7 males reared at 

 Brownsville, November 21, 1938, by O. D. Deputy, from a chrysalis of 

 Papilio sp. 



4. ARACHNOPHAGA COSTALIS, new species 



Agrees very closely with the description of nociia and may prove 

 to be only a host variant of that species. It apparently clijffers from 

 that species only by being much larger, by having the black bristles 

 on tlie scutellum somewhat more numerous, by having four instead 

 of three short, stiff spines on the outer apical margin of the middle 

 tibia, by having the antenna proportionally somewhat longer, by 

 having a distinctly more conspicuous though narrow flange on the 

 apical one-third of the ventral margin of the posterior femur, and by 

 being more extensively marked with black or dark brown. 



Female. — Length 4.4 mm. Color varying to some extent but mostly 

 brownish black with some metallic reflections. Holotype brownish 

 black; face below antennae, mandibles except their apices, palpi, occi- 

 put, and temples testaceous; a median stripe on frons starting at 

 median ocellus and embracing the whole scrobicular cavity and a 

 narrow longitudinal stripe along upper part of each inner orbit dark 

 reddish testaceous with brassy tints in some lights; vertex and frons, 

 except as indicated, blackish with some metallic greenish reflections; 

 cheeks and lower part of temples brownish testaceous. Antennal 

 scape testaceous, flagellum black. Pronotum yellowish testaceous; 

 mesoscutum brownish black with its anterior lateral angles dark 

 testaceous; scutellum dark brownish, slightly paler toward base; 

 propodcum brownish with weak metallic reflections; pleura testaceous 

 mixed with brownish ; mesosternum with a broad black longitudinal 

 stripe down the middle. Anterior legs entirely testaceous; middle 

 and posterior legs also testaceous but tinged with brownish, the pos- 

 terior tibiae especially dark. Forewing hyaline from base to begin- 



