106 ENTOMOLOGICAL SOCIETY 



Herr Reissig, who reared it with Encyrtus&neus, from Coccus. 

 Later I reared a male from Chermes picecz ' ' ; and of the third, 

 Foerster says : ' ' I have reared it from a plant-louse a 

 Pemphigus and Herr v. Heyden, at Frankfort, reared it most 

 probably from the same plant-louse on Pinus sylvestris. ' ' This 

 is all the information we get from European entomologists on 

 the habits of Pachyneuron. 



The genus was first recognized in this country when I found 

 it in 1884 among some parasites reared by Mr. Hubbard, at 

 Crescent City, Florida, during his work on orange insects. 

 This species, which I described as P. anthomyice in Mr. Hub- 



FIG. 6. Pachyneuron micans Howard. Female enlarged. 



bard's Report on Orange Insects, was reared from the 

 puparium of a dipterous insect, the larva of which fed upon 

 Aphis citrulli, and which Dr. Williston was unable to deter 

 mine as other than a probable new genus of Anthomyiida. (It 

 is figured and described on page 185 of the report just men 

 tioned). Mr. Hubbard kept the puparium of the fly, with the 

 hole from which the Pachyneuron had emerged, and there was 

 not the slightest doubt of the accuracy of the observation. 



A few months later Prof. A. J. Cook sent me another species, 

 which he wrote he had reared from a bark-louse on Blue Ash. 

 For this I sent him the MS. name P. altiscuta (which he used 

 in his next published report), and (having Mr. Hubbard' s ex 

 perience in mind) I asked him whether there had not been 

 syrphid larvae among his bark-lice, and whether this parasite 

 might not have come from such a syrphid rather than from 

 the coccid. He replied that there were syrphid larvae among 

 the lice, but that he thought the parasite had issued from the 

 latter. 



Soon after other material of Mr. Hubbard' s came to my 

 notice, and another species of Pachyneuron was found, which 



