48 Rev. T. A. Marshall's Monograph of 



near the extremity. Valves of the terebra black. ^ Similar, 

 black ; oral parts yellowish ; palpi fuscous or black ; antenna) 

 black, about 23-jointed ; 4 posterior coxaa, base of intermediate 

 femora, and outer side of hind femora and tibiae infuscated ; or the 

 legs sometimes almost entirely black. Length, 1^ ; exp. 3 lines. 



Easily confounded with the preceding species, being 

 equally common, and attacking some of the same species 

 of Aphides. The antennas of ervi are distinctly longer 

 and more slender, with one or more additional articula- 

 tions; the legs also are longer, and usually flavescent ; the 

 discrimination of the males is more difficult, but the 

 antennae of eo^vi are 23-jointed. Haliday reared specimens 

 from some indeterminate pucerons infesting Ewum 

 hirsutum, the tine-tare, and some species of Trifolium. 

 The Bignell collection contains a good number bred out 

 of Siphonophora urticie, Kalt., S. ruhi, Kalt., S. rosx, 

 Reaumur, Tychea ithaseoli, Passerini, and Aphis scahiosie, 

 Kalt. The only hyperparasite noted w-as the Chalcid 

 Isocratus mncus, Nees, 



14. Ajihidius uhni, Marshall. 



A. uhti, Marsh., lib. cit., p. 576, $ $ . 



9 Black ; prothorax brown above, testaceous beneath ; abdomen 

 brown with the anterior sutures pale. Oral parts and palpi 

 testaceous. Antennae much shorter than the body, 18-jointed, 

 rather stout, black, with the two basal joints and the base of the 4th 

 testaceous. Furrows of the mesonotum perceptible ; metathorax 

 carinated, areated. Wings hyaline ; squamulte, radicles and nervures 

 dull testaceous ; stigma very pale, almost hyaline ; nervures very 

 fine, scarcely discernible ; cubital nervure continued to the end of 

 the 1st cubital areolet. Legs testaceous ,• 4 posterior femora slightly 

 infuscated ; hind coxa? marked above, at the base, with a dusky 

 spot. Abdomen lanceolate, much longer than the head and thorax ; 

 1st segment nearly linear, three times as long as broad, testaceous 

 as far as the middle, thence to the apex, black, its tubercles effaced ; 

 following segments brown ; 2nd with its hind margin broadly pale ; 

 3rd more narrowly margined ; 4th and following rufescent 

 posteriorly. Valves of the terebra black. (J Smaller ; antenna) 

 stouter, as long as the body, with 20 discrete joints, black, with the 

 radicle testaceous ; prothorax black ; legs brown with the 2nd joint 

 of the trochanters and the base of the tibiae and of the tarsi, pale ; 



