112 Psyche [June 
reared in numbers in connection with this species from the same 
host lot. In several of the host puparia in other lots from which 
P. dubius emerged (single specimens) there was found in each the 
blackened, compact meconium of the parasite, somewhat similar to 
that of Spalangia and Muscidifuraz, as well as the remains of a 
pupa of Musca, which fact indicates primary parasitism. The evi- 
dence available, therefore, points to Musca domestica as the host 
of this species, which we consider as a solitary, external parasite 
with habits similar to those of Muscidifurax and Spalangia. 
Pachycrepoideus dubius Ashm. sp. nov. 
Ashmead, Mem. Carnegie Mus., I, pp. 329, 383 (1904). 
Female. Length variable, 1.45-2.10 mm. Normal for the tribe. Gen- 
eral color nigrozneous, black with slight zneous reflections, submetallic but 
in bright sunlight metallic dark-greenish, the abdomen smooth and shining, 
polished black, like surface of tar, the head and thorax closely retic- 
ulated or confluently punctate, reflective, somewhat glossy and sparsely 
hispid; antenne concolorous but not metallic, the scape, pedicel and first 
two ring-joints variable, usually fuscous, the pedicel dusky dorsad; coxe 
concolorous, the cephalic and intermediate coxz more diluted in color, the 
posterior coxe metallic; legs variable, uniformly fuscous, with the apical 
tarsal joint dusky or black, or else fuscous with more or less blackish in the 
dorsal aspect of the femur or the whole femur distinctly darker than the 
following joints; tegule fuscous; wings hyaline, venation neutral black, the 
marginal vein conspicuous. Eyes inconspicuous in color, dark garnet, the 
iniddle longitudinal third much darker, forming a dark median longitudinal 
stripe; ocelli liquid pinkish. Venter concolorous. Clothing of body in- 
conspicuous. 
(Cephalic aspect) head sub-circular, circularly triangular, slightly wider 
than long, face with a median impression along the scrobes, the scapes lying 
side by side in the impression and extending not quite to the cephalic margin 
of the vertex or to the dorsal apex of the eyes and less near to the cephalic 
ocellus; clypeus slightly wider than long, slightly emarginate at the meson 
of its apical (ventral) margin, its basal or proximal (dorsal) margin 
slightly convex, its sutures obsolete, but the whole sclerite slightly im- 
pressed and finely, longitudinally striate; antenne inserted nearly two 
thirds down (ventrad) the face, slightly below (ventrad) an imaginary 
line drawn between the ventral ends of the eyes, but not especially near the 
clypeus, being slightly more the distance above (dorsad) that sclerite as 
the latter is long at the median line; (lateral aspect) genal sulcus absent; 
the cheeks rounded and as long as the length of the eyes; the latter rounded- 
ovate, longer than wide, with sparse, minute sete, practically naked, their 
