2 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
ventral valves protruding, ventral spine short. Wing pubescent, al- 
most nonciliate, radial cell open, three times as long as broad, areolet 
present but not distinct. With width of the head used as a base, the 
length of mesonotum ratio is 1.0; antenna 2.0; wing 2.7. Length 
2.5—3.65 mm. Average of 17 specimens 3.18 mm. 
Male——More infuscated. Antennae 15-segmented, segments 2-5 as 
5:15 (slightly bent) :10:11 and the last two as 9:10. Length of big 
tergite to height as 22:19, with only a small median dorsal group of 
punctures posteriorly. Length 2.05-2.85 mm. Average of 18 speci- 
mens 2.46 mm. 
Types.—U. 8S. N, M. No. 56370: Type female, allotype, and six para- 
types. Paratypes in American Museum of Natural History, Chicago 
Museum of Natural History, Museum of Comparative Zoology, Acad- 
emy of Natural Sciences of Philadelphia, and California Academy of 
Sciences. 
Biology.—Guests in the galls of Dryocosmus favus Beutenmueller. 
Kmerged in September and October from galls collected the previous 
October and from which the makers had emerged the previous winter. 
Habitat-——The type and allotype were selected from a series from 
galls collected at Washington, D. C. Paratype locality, Ironton, Mo. 
Genus CHROPTRES Hartig 
CEROPTRES CONFERTUS (McCracken and Egbert) 
Periclistus confertus McCRACKEN and Ecprrt, Stanford Univ. Biol. Ser., vol. 3, 
No. 1, p. 62, 1922. 
The types of this species go in Ceroptres and differ from the other 
described American species in being reddish brown instead of black. 
Genus NEUROTERUS Hartig 
NEUROTERUS ARGENTATUS, new species 
Female.—Black; antennae, coxae, femora, and tibiae brown, tro- 
chanters and tarsi almost white. Head finely coriaceous, face sparsely 
pubescent, malar space 0.8 eye with a groove, cheeks not broadened 
behind eyes. Antennae 13-segmented, lengths as (scape) 25:24(12) : 
25(5) :20:17:17:16:16:17:17:16:16:17(10). Mesonotum smooth, 
bare, without grooves. Mesopleura and sides of pronotum coriaceous. 
Wing clear, pubescence short, margin ciliate, veins brown, first 
abscissa of radius faintly angulate, areolet reaching one-fourth way 
and cubitus quite to basal, second cross vein at angle of 60° with basal. 
Tarsal claws weak, simple. Abdomen as long as thorax, as high as 
long. Ventral spine six times as long as broad in side view. With 
stlth of head used as a base, the length of mesonotum ratio is 1.0; 
antenna 2.0; wing 3.9; ovipositor 1.9. Range in i Tongan of 81 speci- 
mens 0.8-1. 1 mm, erouaias 0.98 mm. 
