66 Rev. T. A. Marshall's Monogra2')h of 



the terebra stout, truncate at the apex. ^ Black, with the two 

 sutures pale, translucid ; palpi black ; antenna) rather shorter than' 

 the body, 15-jointed, black. Legs black. Length, 1 ; exp. 2 lines. 



Bred by Bignell out of Aphis myosoticlis, Koch, found 

 infesting Polygonum aviculare, common knot-grass. 



II. Males whose Females are unknown. 



40. Aphidms silenes, Marshall. 



A. silenes, Marsh., lib. cit., p. 603, $ . 



^ Black ; pectus rufescent ; abdomen piceous, with the 2nd suture 

 pale, 1st segment black posteriorly. Clypeus, palpi, and mandibles 

 pale brown. Antennae stout, 20-21 -jointed, longer than the body, 

 black, with the two basal joints brownish, the 3rd testaceous at the 

 base ; joints 3-6 angulated on the outer side, subserrate, the rest 

 nearly filiform. Mesothoracic furrows faintly indicated ; meta- 

 thorax carinated, areated. Wings hyaline ; squamulge and radicles dull 

 testaceous ; stigma narrow, hyaline or hardly yellowish ; nervures 

 pale brownish ; 2nd cubital areolet closed on the underside by a very 

 fine nervure, hardly visible, i.e. cubital nervure about half com- 

 pleted. Legs testaceous ; femora and tibiae of the 4 posterior 

 bifuscated ; coxae, trochanters, and base of the tibiae, pale ; hind 

 coxae infuscated at the base ; a second specimen has the legs pale 

 testaceous with the hind femora streaked with fuscous above. 

 Abdomen claviform, somewhat longer than the head and thorax ; 

 1st segment linear, margined, without visible tubercles. Length, 

 1 J ; exp. 2^ lines. 



Parasite of Siphonophora p)isi, Kalt., the puceron of 

 different species of pea, Pisuni arvense, sativum, etc., also 

 of Silcne injiata, bladder campion, and other plants. 

 Reared by Bignell. 



./ "■ 



41. Aphidius crithmi, Marshall. 

 A. crithmi, Marsh., lib. cit., p. 604, ^ . 



(J Black ; abdomen piceous, with the extremity of the 2nd seg- 

 ment, and the 2nd suture, pale. Palpi brown. Antennae 19-jointed, 

 black, setiform, not longer than the body. Mesothoracic furrows 

 faintly indicated : metathorax smooth, carinated in the middle,^ 



