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INTERNAL OR TRUE PARASITES. 
Aphidius testaceipes Cress. 
(Fig. 19.) 
Synonyms: Lysiphlebus abutilaphidis Ashm.; Lysiphlebus baccharaphidis Ashm.; 
Lysiphlebus basilaris Prov.; Lysiphlebus citraphis Ashm.; Lysiphlebus coquil- 
letti Ashm. ; Lysiphlebus cucurbitaphidis Ashm. ; Lysiphlebus crawfordi Rohwer; 
Lysiphlebus eragrostaphidis Ashm.; Lysiphlebus gossypii Ashm.; Lysiphlebus 
myzi Ashm.; Lysiphlebus minutus 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.— ApMdtus 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 coxae, 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 
testaceous. 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 this 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- 
