Lad described two as Triekogramma orgyicb and T. fraterna. The first 
of these, however, seems to be a Cratotechus which lias not since been 
reared, while the second is a hyperparasite of the genus Holcopelte. 
There is not the slightest evidence, however, that this second parasite 
ever attacks the tussock moth, since Fitch simply found it walking upon 
rose leaves in September, "where/' he says, "it was very probably 
searching for these same caterpillars in which to deposit its eggs. 7 ' 
Riley reared Pimpla inquisitor, an undetermined Tachinid fly, a true 
egg parasite of the genus Telenomus. and two species of the genus 
Pteromalus, while he also obtained cocoons of a Microgaster from tus- 
sock-moth caterpillars, without, however, rearing the adult. The adult 
of what is x>robably this species was reared later by Prof. F. M.Webster 
and was described by Mr. Ashmead as Apanteles orgyitB (Bull. Ohio Exp. 
Sta,, Tech. Ser. I, p. 159). Dr. Weed records (Psyche, Y, 51) Pimpla 
conquisitor Say, Xorinal, 111.. July 14, 1883. Dr. Lintner is also said 
to have reared a species of Tetrastichus from this larva. This last 
species is undoubtedly hyperparasitic. and one if not both of the two 
species recorded as belonging to the genus Pteromalus are also probably 
hyperparasites. 
The close observations which were made upon abundant material 
beginning early in August, 1895, and carried through until the autumn 
of 1896, have resulted not only in vastly increasing this list, but in giv- 
ing us some definite ideas as to the habits of the species involved and 
as to their more or less intricate interrelations. „ 
The species reared are as follows: 
LIST OF PRIMARY PARASITES. 
A. — Hymenoptera. 
Pimpla inquisitor Say. Theronia fulvescens Brullo". 
Pimpla conquisitor Say. Apanteles delicatus n. sp. 
Pimpla annulipes Say. Apanteles liyphantrbr Riley. 
Amorphota orgyiae n. sp. Chalcis ovata Say. 
Meteorus communis Cresson. Pteromalus cuproideus n. sp. 
Meteorus hyphantrnp Riley. Cratotechus orgyiae Fitch. 
Limneria sp. Telenomus orgyiae Fitch. 
Limneria valida Cresson. 
. B. — Diptera. 
Frontina aletia' Riley. Euphorocera claripennia Maeq. 
Frontina frenchii Will. Exorista gri S eomi».ans V. d. W. 
Tachina mella Walk. Winlhemia 4-pustulata Fab. 
LIST OF HYPERPARASITES. 
HjimevopUi a. 
Hemiteles townsendi Ashmead. Spiloehalcis debilis i Say). 
Bathythrix meteori n. sp. Eupelmus linineriae n. sp. 
Bathythrix pimpla- n. sp. Dibrachys boucbeanus (Ratz.). 
Adistola americana n. sp. Elachistus cacceocia? How. 
Otacustes periliti Asbm. Elasmus atratus n. sp. 
Habrocytus thyridopterigis Asbm. Syutomosphyrum esnrus ( i.'iley). 
Pezomacbus insolitus u. sp. Asecodes albitarsis Ashm. 
