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



life. Legs ferruginous ; iiind femora infuscated. Abdomen linear- 

 lanceolate ; 1st segment linear, blackish ; 2nd and 3rd piceous or 

 testaceous. Valves of the terebra rather slender, black. ^ Similar ; 

 antenna) entirely black, not longer than those of the 9 • Length, 

 Ij ; exp. 2i lines. 



This parasite is rather commoti in the fields, attacking 

 certain pucerons which live on the tine-tare, Ervuiii 

 hirsiitnm, the pest of corn-fields ; the species of these 

 pucerons has not been determined. Like the preceding, 

 it also destroys Myzus cerasi, Fab. According to Haliday 

 the $ , in the act of oviposition, carries the abdomen in 

 the same manner as the true Ajjhidii, but she pierces the 

 back of the puceron, having the terebra somewhat 

 inclined, for this purpose ; the stroke is not so instan- 

 taneous, being often prolonged for several seconds. 



8. Eplicdrus 'plagiator, Nees. 



Bracon x>lagiator, Nees, Mag. Ges. Berl. 1811, p. 17. 

 Aphidius (JE.) plagiator, Hal, /. c. ; Curtis in Morton's 



Cyclop. Agric, s. v. Aphis, pi. xvii, ff. 7, 8 ; Farm. 



Ins. pp. 290, 292, pi. xxxix, f. 14, $ %. 

 Aphidius parcicomis, Nees, Mon., i, 16; JUlassus parci- 



cornis, Wesm., Nouv. Mem. Ac. Brux., j). 86, pi. i 



(wing), $ ?. 

 E. plagiator, Marsh., lib. cit., p. 544, ^ $ . 



O Antennse longer than the head and thorax. Black, shining, 

 pubescent, abdomen piceons. Oral parts brownish red ; pal^n obscure. 

 Antennae compressed, rather short, the apical joint not longer than 

 the preceding ; 1st joint rufous, the rest black. Metathorax 

 regularly areated ; the middle compartment generally the most 

 distinct, pentagonal. Wings hyaline, nervures brown ; stigma rather 

 larcre, not much elongated internally, testaceous. Legs dull red, the 

 middle pair darker, the hind pair darker still, with the trochanters 

 and the base or the greater part of the tibioe rufescent ; 4 posterior 

 coxre blackish. Abdomen linear-lanceolate, piceous brown, some- 

 times obscurely testaceous in the middle of the 2nd segment ; 1st 

 segment narrow, cylindric, rugose, marked before the extremity 

 with a transverse impression. Valves of the terebra slender, conical, 

 black, a little longer than the apical segment, truncate at the ex- 

 tremity. ^ Similar, usually smaller, with darker legs ; alxlomen 

 rounded at the extremity. Length, Ul ; exp. 1-2 lines. 



