TENTH KEPOKT OF THE STATE ENTOMOLOGIST 3C9 



were puncturing and deforming the leaves of the calyx and the 

 corolla; and furthermore, that the ants were actively engaged in cap- 

 turing and carrying off for their food some of the smaller insects. 



Derostenus sp. ? 

 (Ord. Hymenoptera: Fam. Chalcidid^,) 



Parings of apple-tree bark received from Mr. F. A. Fitch, of Ran- 

 dolph, Cattaraugus county, N. Y., in April, 1893, bearing numerous 

 crushed or broken cocoons of the apple-tree Bucculatrix, Bucculatrix 

 pomifoliella Clemens, contained within the cocoons and on the bark 

 around them, a large number of small, shining black pupa-cases, from 

 which the insects had escaped. Ten of them were counted packed 

 against, and partly underneath, one of the cocoons near to three round 

 holes made in the cocoon from which doubtless the parasites had 

 emerged. 



The pupa-cases were identified by Dr. C. V. Riley as those of a 

 species of Derostenus, probably undescribed. 



The genus belongs to the subfamily of Entedoninm of the Chal- 

 cididcB. No American species of this genus have been described. 

 One appears in Cresson's Hymenoptera of North America, 1887, under 

 the name of D. primus Howard MS,, which had been bred by 

 Dr. Riley from a leaf-mining Coleopter, Odontota suturalis.'^Mr, 

 Howard remarks : " A number of the brilliant little species of this 

 genus have been bred in this country from the leaf-mines of both 

 lepidopterous and coleopterous larvae. None have ever been described;, 

 they are very difficult of separation and approach very closely to the 

 European species. * * * 'pjjg fg^^^ ^\^^^ ^ species of this genus has 

 been bred from the pupa of an Eulophtcs [a Chalcid] would seem to 

 indicate that Derostenus may consist of secondary parasites" 

 {JSntom-oloffica Americana, i, 1885, p. 117-18). 



This same Derostenus parasite has been reared (March 3, 1887) 

 from the larvfe of Dacculatrix Canadensisella Chamb., occurring in, 

 New York {Insect Life, v, 1892, p. 16). 



Operations against the Gypsy-Mothln]Massachusetts. 



(Ord. Lkpidopteea: Fam. Bombycid^.) 



In preceding reports I have written of the accidental introduction 

 into the State of Massachusetts, in the year 1869, of the destructive 



47 



