116 Psyche {June 
moderately short; the distal joint of the maxillary palpi clavate and hairy 
at its tips. 
Described from eight males and fourteen females, unless other- 
wise stated, now in the collections of the Illinois State Laboratory 
of Natural History, Urbana, Illinois, and reared in the insectary 
of the office of the State Entomologist of Illinois, at Urbana during 
the late summer of 1908, from the following experiments: (1) One 
female appeared Sept. 11, 1908, in company with two females of 
Nasonia brevicornis Ashmead from decomposed chicken entrails 
infested with dipterous maggots, taken from the city dumping 
grounds, Champaign, August 22, 1908; from these viscera were 
obtained Chrysomyia macellaria (Fabricius), Sept. 7, Calliphora 
erythrocephala (Meigen), Sept. 11, and Sarcophaga sp. “K,”* 
Sept. 22. (Accession No. 41003, 1 * tagmounted; ? head in xylol- 
balsam); (2) One female appeared Sept. 3 from a cage containing 
maggots in decomposed watermelons from the same place, and from 
which were reared a Drosophila, August 30 to Sept. 17, and Musca 
domestica, September 1. (Accession No. 39808, 1 * tagmounted.) 
(3) On Sept. 10, a number of Pteromalids were collected from the 
cages in which muscid and other dipterous larve were breeding and 
confined separately in capsules each with a single puparium of 
Musca domestica. One of these Pteromalids proved to be a female 
of P. dubius * which was observed to oviposit into the host puparium 
on Sept. 10. The resulting progeny proved to be a single female 
which was found on the fifth of the following October. (Accession 
No. 40177, 1° tagmounted, head in xylol-balsam). (4) Five 
males and nine females appeared October 24 or previously from a 
cage containing a quantity of puparia of Musca domestica reared 
from the maggots collected in horse manure, Sept. 20, in a manure 
box in Urbana, and then left until Sept. 30 exposed in the insectary 
where they were evidently parasitized. On the latter date, each 
puparium was isolated in a capsule, and from these capsules were 
taken the nine females and five males; other pteromalids, Muscidi- 
furaz and Spalangia, were very abundant. (Accession No. 40253, 
4°’s, 9°’s tagmounted; ° head in xylol-balsam. Remaining ¢, 

1New species; designated thus for convenience. 
2? Homotype in U. S. National Museum collection. 
