OF WASHINGTON. 109 



ON ANTHOMYIID^. 



Pachyneuron anthomyicc Howard. From puparium of au anthomyiid, 

 larva feeding on Aphis citrulli ; reared by H. G. Hubbard, Crescent 

 City, Fla. 



ON 



Pachyneuron sp. From syrphid feeding on Myzus ribis ; reared by 



Webster, at Lafayette, Ind. 

 Pachyneuron sp. From syrphid feeding on Aphis brassiccs ; reared by 



Koebele, at Alameda, Cal. 



Pachyneuron sp. From syrphus puparium ; B. D. Eastman ; loc. ? 

 Pachyneuron syrphi Ashm. From syrphid puparium ; reared by Ash- 



mead, at Jacksonville, Fla. 

 Pachyneuron allograph Ashmead. From puparia of Allograpta obliqua, 



larvae of which had been feeding on Aphis brassicce ; reared by 



Ashmead, at Jacksonville, Fla. 

 Pachyneuron sp. From puparia of Baccha babista, larvae of which had 



been feeding on Aphis citrulli ; reared by Hubbard, at Crescent 



City, Fla. 

 Pachyneuron sp. From puparia of Mesograpta polita, larvae of which 



had been feeding on corn pollen ; reared at Washington from speci 



mens received from New Jersey ; also reared by Ashmead, at Jack 



sonville, Fla. 

 Pachyneuron sp. From puparia of Baccha? sp., larvae of which had 



been feeding on Aphis gossypii ; reared by Hubbard, at Centreville, 



Florida. 



Thus we have records of twenty distinct rearings of species 

 of this genus, and find that it is an enemy of such well-known 

 pests as the grapevine Phylloxera, the grain plant-louse and 

 the cabbage plant-louse, so that the Dr. Jekyll side of its two- 

 faced character is extremely philanthropic. In addition to 

 placing on record the anomalous features of the habits of the 

 insects of this genus of parasites, the short historical summary 

 of my own impressions will serve to point the old, old warn 

 ing as to the danger of attempting a generalization without 

 broad foundations and extended material. 



Mr. Schwarz read the following paper : 



CONTRIBUTION TO THE LIFE-HISTORY OF CORTHYLUS 



PUNCTATISSIMUS, AND DESCRIPTION OF 



C. SPINIFER N. SP. 



BY K. A. SCHWARZ. 



The food-habits of Corthylus pundatissimus remained un 

 known until, in the fall of 1882, Dr. C. Hart Merriam discov- 



