514 Cc. H. RICHARDSON 
most important: the normal non-tridentate head, the absence 
of distinct antennal furrows, the ten or twelve-jointed antennae 
and the presence of a transverse furrow in front of the posterior 
tip of the scutellum. ? 
Description of Spalangia muscidarum.’ Male: (fig. 1): Length 
3 to 3.5mm. Frontal aspect of head oblong-ovate, with numer- 
ous large depressions; eyes ovate, not emarginate in front; entire 
head covered with a short rather stout light-colored pile; ocelli 
present; labrum very small in proportion to length of head, the 
free border rounded, hairy; mandibles bidentate, length more 
than twice the width at base; antennae ten-jointed; scape as 
long as the three succeeding joints, covered with hair of the same 
texture as that on the head, second joint shortest; third joint 
almost as long as the succeeding two; the remaining seven joints 
except the last which is longer, of equal length; they are covered 
with fine light-colored hair; genae punctate like the face. Thorax 
above with the three divisions distinct; anterior narrowed por- 
tion of pronotum finely punctate and sharply marked off from 
the posterior part, which is sparsely and very coarsely punctate 
except for a median smooth space, widest posteriorly; a trans- 
verse row of deep umbilicate punctures near its posterior margin; 
mesonotum smooth and polished anteriorly, sparsely punctate 
posteriorly and laterally, leaving a smooth median space for its 
entire length; parapsides prominent with a few scattered punc- 
tures; parapsidal grooves deep, punctate; scutellum smooth, 
sometimes with several scattered punctures at sides; a distinct 
punctured line crosses it posteriorly; post-scutellum smooth; 
metanotum with two deeply punctate longitudinal lines sepa- 
rated by a smooth raised area; on either side of these lines of 
punctures is a smooth space bounded posteriorly and laterally 
by numerous deep punctures, smallest and most abundant on 
the extreme sides. Mesopleurae each with a single fovea; an 
aciculate depression below and behind the tegula. Abdomen 
smooth except petiole which is finely aciculate; third segment 
largest. Hind coxae swollen; first joint of tarsi not quite as long 
’ Richardson, loc. cit. 
