104 



THE SPRING GRAIN-APHIS OR "GREEN BUG. 



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INTERNAL OR TRUE PARASITES. 



Aphidius testaceipes Ore??. 

 (Fig. 19.) 



Synonyms: Lysiphlebus abutilaphidis Ashm.; Lysiphlebus bacchar aphid is Ashm.; 

 Lysiphlebus basilaris Prov.; Lysiphlebus citraphis Ashm.; Lysiphlebus coquil- 

 letti Ashm. ; Lysiphlebus cucurbitaphidis Ashm. ; Lysiphlebus craufordi Rohwer; 

 Lysiphlebus eragrostaphidis Ashm.; Lysiphlebus gossypii Ashm.; Lysiphlebus 

 myzi Ashm.; Lysiphlebus miyiutus Ashm.; Lysiphlebus persicaphidis Ashm. 

 (=L. persiaphidis Ashm. : Lysiphlebus piceiventris Ashm.; Lysiphlebus tritici 

 Ashm. 



DESCRIPTION AND IDENTITY. 



Female. — Piceous or shining black, smooth and polished, impunctured ; mandibles 

 and palpi pale; antennae brownish -black, sometimes more or less pale beneath, 



Fig. 19. — Aphidius testaceipes, principal parasite of the spring grain-aphis: Adult female and antenna of 

 male, greatly enlarged. Egg at right, highly magnified. (From Webster 



13-jointed, the joints faintly fluted or grooved, the last one longest and thickest; 

 wings hyaline, iridescent, stigma pale; legs, including coxa?, yellowish -testaceous, 

 the posterior pair generally more or less fuscous or blackish: abdomen often brown 

 or pale piceous, with the first and sometimes part of the second segment more or less 

 ceous. Length, 0.07 inch. 



Habitat. — Rockledge, Fla.; Selma, Ala.; and Pocomoke City. Md. 



Parasitic upon an aphidid infesting twigs of orange, an aphidid on the cotton 

 plant, and Aphis avense Fab. 



This parasite, which is probably the most important of all the nat- 

 ural enemies of Toxoptera, has for tins reason claimed more of our 

 attention than all of the other foes combined. Hence a large amount 

 of data has been collected, bearing upon nearly every phase of its 

 development. Owing to the fact that large numbers of individuals 

 have been reared by Messrs. Kelly and Urbahns from known par- 



