40 
fourth of their length, posterior knees slightly dusky, tips of posterior 
tibiae distinctly dusky. Wings hyaline, nervures and stigma dusky. 
Abdomen translucent, yellowish-white in its central one-third; the 
remaining two-thirds piceous black, with a distinct narrow yellowish 
annulus at the base of the third joint. In the larger specimen, 
which seems to be immature, the basal abdominal joint and the 
articulations of the terminal joints are light rufous. Appendiculum 
of the abdomen composed of two extremely fine setae, thickened at 
their base, whose length slightly exceeds the extreme width of the 
abdomen. 
The female differs from the male in the head, from the mouth 
upwards, being piceous. The thorax and pectus are also piceous 
black. Abdomen as in the smaller male. Ovipositor, which is dusky, 
slightly exceeds in length the width of the abdomen.” 
i * 
Pezomaclius minimus. Walsh. 
‘'Length of body, .07 to .1 inch (2 to ‘2J millimetres). Male—Gen¬ 
eral color piceous; eyes black; antennae black, except toward the 
base, where they are light rufous; legs rufous, hind legs a little 
dusky. Abdomen narrowed; second, and sometimes the third joint 
annulate, with rufous tip. The female differs from the male in the 
thorax being almost invariably rufous, and in the first three ab¬ 
dominal joints being generally entirely rufous, with a piceous an¬ 
nulus at the base of the third, which is sometimes absent. The 
abdomen is also fuller and wider. Ovipositor dusky; equal in 
length to the width of the abdomen. No vestige of wings in either 
sex, and the thorax contracted and divided, as in Formica 
The larvae of this species issue from the body of the worm and 
spin upon its skin minute cylindrical cocoons, regularly arranged in 
a mass and enclosed in floss. 
It is preyed upon by a minute Chalcis-fly, described as follows: 
Chalcis aleifrons. Walsh. 
“Length of body, .08 inch, or two millimetres. General color, 
black. Head punctured; antennae brown, lighter tojvard the tips. 
On the face a greenish white triangle, the apex of which com¬ 
mences a little above the insertion of the antennae, extends to the 
outer corners of the mouth, and incloses on its lower margin, im¬ 
mediately above the clypeus, a round black spot. Clypeus greenish 
white, fuscous on its basal margin, and with a black spot at tip. 
Thorax densely punctured. Wings hyaline; subcostal nerve fuscous, 
for three-fourths of the distance to the tip, as also its ramus. Cos¬ 
tal nervure of the lower wing also fuscous for two-thirds of its 
length; all other nervures hyaline. Posterior coxae incrassated; 
spurs obsolete; knees, tibae, and tarsi of anterior and intermediate 
legs greenish white. In the posterior legs, the trochanters, a spot 
on the thighs above, an annulus near the base of the tibae, the 
tips of the tibae and also the tarsi are greenish white. Extreme 
tips of all the tarsi fuscous. x\bdomen glabrous, polished, equal in 
length to its peduncle.” 
