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APPENDIX.
ing near the head ; wings hyaline; nervures fuscous; stigmata rather large, triangular, fuscous, dull white at the anterior and posterior tips, and also on the costal edge; ter-gum paler, disk of the first segment blackish.
Length less than one-fifth of an inch.
This insect is one of the many species that deposit their eggs in great numbers in the larva of Lepidopterous insects. In a dead and dried larva, which I found adhering to a tree, were the follicles of forty or fifty individuals of this Species. It varies somewhat in the quantity of the black colouring with which it is marked. In some specimens this extends not only along the pectus, but is continued in a capillary line along the edge- of the thorax, the metathorax also is entirely black, the tergum is blackish at tip and on the sides, the pectus has a black spot in the middle, and the hypostoma has a transverse^ blackish spot.
STEPHANUS, Jur.
S. rufipes. Black; abdomen sessile; thorax not remarkably attenuated before.
Inhabits Pennsylvania.                                              :
Body somewhat sericeous; palpi pale yellowish; scutel with a groove on each side, rough; metathorax rough, and with two slightly elevated, longitudinal, distant lines; wings hyaline; a large, triangular,fuscous, carpal spot;/ee< rufous; posterior pair of tarsi dusky; abdomen a little rough at base; oviduct as long as the abdomen.
Length one-fifth of an inch.
Although the arrangement of the wing nervures agrees precisely with S. coronatus, Jur., yet the form of the body differs materially, the thorax not exhibiting the remark