﻿92 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lOO 



Black. More or less distinct piceous stains on the head, mandible, 

 and legs; wings black, the forewing with a slightly postmedian, oval, 

 somewhat oblique transverse yellow area as indicated in figure. 



Male: Unknown. 



Specimens. — 9, Marion Coimty, Ark., J. C. Bridwell (Washington). 

 9, Washington, D. C, August 9, 1920, L. H. Weld (Washington). 

 9, La Salle County, 111., August 1935, F. G. Werner (Cambridge). 9, 

 Michigan, Townsend (Washington). 9, Cadet, Mo., J. G. Barlow 

 (Washington). 9, HoUister, Mo., August 12, 1912, H. H. Knight 

 (Ithaca). 9, Harrisburg, Pa., reared from Carya ovata, August 7, 

 1914, W. S. Fisher (Washington). 2 9, Harrisburg, Pa., August 11, 

 1912, Champlain (Washington). 9, no data, from A. Fitch collection 

 (Washington) . 



This species is rare. The records indicate that it occurs from the 

 Atlantic to the one-hundredth meridian in the Transition and Upper 

 Austral Zones. Adults fly in the first half of August. 



2. AULACOSTETHUS YIOLACEUS (Bradley), new combination 



Deraiodontus violaceus, Bradley, Zeitschr. Hymen. Dipt., vol. 5, p. 26, 1905. 

 Lectotype: 9, Washington, D. C. (Washington); hereby selected. 



Forewing entirely black. 



Forewing about 12 mm. long; as seen from above, head about 0.65 

 as long as wide; frons with fine, rather sparse punctures; top of head 

 with fine, moderately distant punctures; as seen from above, the 

 temple about 0.9 as long as the eye, full, strongly convex; occipital 

 carina sharp and thin, but not produced; flagellum shorter than in 

 other Nearctic species, the first segment about 3.0 as long as wide 

 and the subapical segments about 2.0 as long as wide; propleurum 

 with a few large, weak punctures; pronotum with strong reticulate 

 wrinkling, its front edge with a triangular projecting tooth; tarsal 

 claws with four or five teeth; ovipositor sheath relatively shorter than 

 in the other Nearctic species, about 0.5 as long as the forewing. 



Black. FlageUum fulvous with the basal 0.4 i and apical 0.1 ± 

 blackish, the rest more or less infuscate; under side of scape of male 

 ferruginous; legs beyond femora fulvous, in the male the fore and 

 middle femora also fulvous and the hind femur brown; wings black. 



Specimens. — cf, Washington, D. C. (allotype, Washington). 9, 

 Vinton County, Ohio, June 20, 1901 (Columbus). 9, Nelson County, 

 Va., July 24, 1927, W. Kobinson (Washington). 



3. AULACOSTETHUS TORRIDUS (Bradley), new combination 



Figure 15, b 



Tropaulacus torridus Bradley, Trans. Amer. Ent. Soc, vol. 34, p. 125, 1908. 

 Type: 9 , Brownsville, Tex. (Lawrence). 



Forewing with the front half brown, most of the rest subhyaline. 



