70 Rev, T. A. Marshall's Monog^^aph of 



13-jointed, as long as the body, blackish, with 3 or 4 of the basal 

 joints pale brownish, Mesothoracic furrows obsolete ; metathorax 

 carinated in the middle. Wings hyaline ; squamula3 and radicles 

 dull testaceous ; stigma hyaline, slightly cinereous ; basal nervures 

 brownish, very fine ; exterior nervures effaced. Fore legs pale 

 testaceous, their femora and tibiae streaked above with fuscous ; 4 

 posterior fuscescent ; hind coxae, trochanters, and knees, pale 

 brownish. Abdomen spathulate, as long as the head and thorax ; 

 1st segment linear, 2^ times as long as broad, almost white, its 

 tubercles situated before the middle ; 2nd and following segments 

 piceous, with the 2nd suture and a median line on the 2nd 

 segment^pale. Length, \ ; exp, 1 J lines. 



Reared once by Bignell out of Callipterus quercios, Kalt,, 

 one of the pucerons of the oak, Quercus robur. 



Doubtful Species. 



Two more species belonging to this genus have been 

 published as British, but my attempts to verify them 

 have not been successful. Their descriptions are here 

 reproduced for the sake of completeness. That the 

 number of indigenous Aphidii vastly exceeds the 47 

 above described, there can be little doubt. I possess a 

 great quantity taken promiscuously in the course of years, 

 but the mere description of their external appearance, 

 without those facts of their economy which alone can give 

 some interest to such a subject, and in the impossibility 

 of correctly pairing the sexes, would be both illusory and 

 wearisome. 



Aphidius lutescens, Haliday. 



A. lutescens, Hal., Ent. Mag., ii. 99 ; Marsh., Species des 

 Hym. d'Eur, et d' Alger, Bracon., vol, ii, p. 614, $ , 



5 Yellow ; eyes and antennae black, scape yellowish ; vertex, 3 

 spots on the mesonotum, scutellum, me ta thorax, 1st abdominal 

 segment, and transverse spots on some of the following segments, 

 infuscated. Legs entirely yellow. Size and proportions of A. rosee 

 (sp, 10); cf, lonicerse (s^. 11). (^ Unknown. Length, H; exp, 3 

 lines. 



The author adds, in a note : " I should have been in- 



