160 MODERN CLASSIFICATION OF INSECTS. 
species to the Entomological Society. I have repeatedly captured 
Monodontomerus obsoletus flying about and entering the holes in 
walls made by Osmie for their nests, in which they were evidently 
about to deposit their eggs; and such is the account of their habits 
given by Fonscolombe. (C. nea.) An exceedingly interesting species 
has been communicated to me by M. Audouin, which he discovered 
to be parasitic in the provisioned nests of Odynerus, Anthophora, 
and Osmia. The male has most singular antenne, and minute rudi- 
ments of wings, so that it does not quit the cell; but the female, 
having been there impregnated, is enabled, by means of her full-sized 
wings, to seek other cells for her progeny. The species has not yet 
been described. Eurytoma plumata J//. is parasitic upon the parasitic 
larva of Microgaster liparidis Bouché (Naturg. Ins. vol. i. p. 166.) ; 
and Pteromalus Braconidis Bouché infests the parasitic larve of Rogas 
linearis. 
Eupelmus Syrphi Bouché (Ceraphron S.) infests the larve of 
Syrphus Ribesii and balteatus. (Vuturg. Ins. p.175.) Pteromalus 
micans Oliv. is parasitic upon Dipterous insects which attack the 
wheat. (Olivier, Premiére Mém. sur quelques Insectes qui attaq. les 
Céréales, 1813.) | Many species infest the lJarve of gall-forming 
Cecidomyiz, as the Eulophus cecidomyianus Bouché, and Eulophus 
erice ZL. Dufour. (Ann. Soc. Ent. de France, 1837, p. 91.) The 
larva of Spalangia nigra is parasitic upon the pupe of Musca domes- 
tica, devouring the intestines. The Ceraphron destructor of Say, 
which is parasitic upon the Hessian fly in America, is evidently one 
of the Eulophides, from the structure of the antennz and wings, as 
represented in his figures. (Journ. Acad. N. H. Soc. Philadelphia, 
1817.) M. Audouin has communicated to me specimens of a curious 
genus, allied to Palmon, which he extracted from the egg-case of a 
species of Mantis, sent from the Isle of France by M. Julien Des- 
jardins. I have also received from Dr. Klug another allied species, 
obtained from the egg-case of a Brazilian Mantis. 
The attacks of species of these insects upon the egg-case of Blatta 
have been alluded to in vol. i. p. 423. 
The species of the genus Chalcis vary very materially in the nature of 
the insects which they attack: thus, whilst C. xanthostigma Dalm. was 
reared from the pupa of species of Hylotoma, C. flavipes was obtained 
from the pupz of Lepidoptera by Fonscelombe, and C. annulata from 
the pupe of American Phalenz by Dr. Pflug. Dr. Klug describes a 
