628 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
Bathyplectes curculionis passes the winter as a larva within its cocoon, 
most of the individuals of B. corvina pupate in the fall and pass the 
winter in that stage or as adults inside the cocoons, unless they have 
been kept in cold storage throughout the summer and winter; in the 
latter case most of them remain as larvae. In field-collected cocoons 
kept in the Hyeres laboratory in the summer of 1922, many perfectly 
formed adults were found in the fall but there were no issuances from 
the cocoons until spring. Although in general this species seems less 
important than B. curculionis , it appeared to be the dominant species in 
some localities in 1922 and 1923. This was true of the Hyeres section. 
We have found B. corvina in practically all the regions in which we 
recovered B. curculionis. 
This parasite also is parasitized by many other insects, chief among 
which is Mesochorus nigripes, as in the case of B. curculionis. 
Bathyplectes tristis (Grav.) 
This species is an internal parasite of the larvae of Phytonomus 
postictis and Hyper a punctata. We found it very scarce in our material 
collected in 1922 and 1923. There is probably one generation a year. 
This insect is parasitized by other species, chief among which is Meso- 
chorus nigripes. The writer has reared what is believed to be Bathy¬ 
plectes tristis from an undetermined weevil collected from wild alfalfa at 
Hyeres, France. 
Tetrastichus incertus (Ratz,) 
This eulophid parasite of the larva was collected chiefly in 1922, from 
the neighborhood of Piedimonte d A life, Italy. Of 6,647 larvae from 
this region, 4,737, or 71.2 per cent, were parasitized by it. Dissected 
larvae were found to contain from 6 to 17 parasite larvae each. It was 
proven to be a primary parasite by breeding it upon nonparasitized 
laboratory-hatched weevil larvae. A small number of these eulophids in 
prepupal larvae were found to be parasitized externally by a eupelmid 
parasite, Eupelmus atropurpureus Dalm. 
This parasite was found in small numbers in material from Switzerland 
in 1913, and we took a few from material from Montmelian, France, in 
1923. 
Parasites of the Prepupae and Pupae 
Dihrachoides dynastes (Forst.) 
This external parasite of the prepupae and pupae of the weevil was 
bred upon nonparasitized prepupae and pupae by T. H. Parks, E. J. 
Vosler, P. H. Timberlake, and the writer. While in general it seems to 
prefer prepupal hosts, it will at times breed just as readily upon the 
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