54 
Described from many male and female specimens reared from cocoons 
of Meteorus. 
Habitat: District of Columbia. 
U.S. National Museum type No. 3511. 
Bathythrix pimple new species. 
Female.-—Length 6.5 mm; expanse 1l mm. General color black; 
head and thorax opaque; abdomen shining; all legs, including coxve, 
rutous, with the exception of black band at the tip of hind femora and 
at tip of hind tibive; hind tarsi blackish, except at base of first joint; 
mandibles dark rufous; palpi nearly white; mesothorax very faintly 
and sparsely punctate; metascutuim divided into six areolets; entire 
thorax with sparse fine whitish pile; lower face with very close and 
dense whitish pile, particularly marked at edge of clypeus. 
Described from three female specimens, presumably parasitic upon 
Pimpla inquisitor. 
Habitat: District of Columbia. 
U.S. National Museum type No. 3512, 
Genus ADIASTOLA. 
Adiastola Foerster. Verh. d. Naturhist. Ver. d. Preus. Rhein]. u. Westph. 1868, p.180. 
Adiastola americana new species. 
Female.—Length 5 mm.; expanse 9 mm. General color black; all 
cox and femora and joints 2 to 7 of abdomen rufous; hind tibize and 
all tarsi black; front and middle tibize rufous; tegule whitish; mandi- 
bles and palpi black; petiole black, finely longitudinally aciculate ; 
ovipositor sheaths nearly black; head and mesonotum very finely and 
very closely granulate, subopaque; mesoscutellum shining; areolets ot 
metascutum marked, the hinder median one very concave, showing on 
profile view two sharp prominences; pleura shining, but very delicately 
shagreened. 
Male.—Resembles female except that abdomen is entirely black and 
that second abdominal segment, as well as petiole, is closely longitudi- 
nally aciculate, though not so coarsely as petiole. 
Described from two females and one male reared from cocoon masses 
of Orgyia leucostigma and presumably parasitic upon Pimpla inquisitor, 
Habitat: District of Columbia. 
U.S. National Museum type No. 3510. 
Genus PEZOMACHUS. 
Pezomachus Graveuhorst. Ichneumon. Europa, II, 1829, p. 867. 
Pezomachus insolitus new species. 
Male.—Length5 mm.; expanse 10mm. General color black; antenne 
dusky; all legs, including coxv, dark rufous; under side of abdomen, 
especially at base, somewhat rufous; clypeus rufous; mandibles rufous, 
black at tip; palpi dusky, nearly black; tegule dark; fore wings yel- 
