— 26 — 



с?. Antennae 15 jointed ; only one specimens has 16 jointed 

 antennae. Darker than the female. Antennae and clypeus dark brown. 

 Legs dark brown; tibiae yellowish at base as well as trochanters 

 at apex and tarsal joints at base. First abdominal segment brown- 

 yellow at base and apex and brown on the discal part. Abdomen 

 dark brown. 



Hab. Poltava Experiment Station. 



An important parasite of our injurious grain-aphids Brachycolus 

 noxius M о r d w i 1 к о and Toxoptera gramimim R о n d a n i. In the 

 case of the last meiitioned plant-louse Diaretiis obsoletus replaces in 

 Europe the american parasite of Toxoptera - Lysiphlebus tritici Ash. 

 Diaretus obsoletus is allied to Aphidius daiici M a r s li a 1 1 and differs 

 by the length of the radial vein and of the first abdominal segment. 



Both host insects do not occur in England or even in central 

 Russia. Therefore most probably the parasite in question is a species 

 confined to the south of Europe. 



Revue Russe d'Entom. ХП1. 1913. X« 1. 



