188 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



Aphidius phorodontis Ashmead. 



Aphidius phorodontis Ashmead, Proc. U. S. Nat. Mus., 1888, p. 

 662. 



A number of specimens of this species were reared from an 

 unidentified aphis infesting the leaves of the common garden 

 hollyhock at Hyattsville, Maryland. 



Aphidius nigrovarius Provancher. 



Aphidius nigrovarius Provancher, Add. Faune Can. Hym., 1888, 

 p. 396. 



This is a handsome and well-marked species. A number of 

 specimens of the species are in the United States National 

 Museum, reared from Lachnns sp. from California, from 

 whence came the original type. 



Aphidius nigripes Ashmead. 



Aphidius nigripes Ashmead, Bui. 47, N. Y. State Mus., 1901, p. 



588. 



This species was very numerous in the wheat fields of the 

 Maryland Experiment Station in May, 1909, when many speci- 

 mens were collected by sweeping with a net. Aphides, the spe- 

 cies of which was not determined at the time, were quite com- 

 mon on the wheat. March 21, 1910, two specimens and March 

 30 about forty specimens were secured by sweeping in a rye 

 field on the same farm. No aphides could be found in the field 

 on this date. A few days later, however, aphides made 

 their appearance on wheat, rye, and oats, and by May 15 they 

 were quite numerous on all three grains. Specimens of the 

 louse were identified by Mr. Pergaude as Macrosiphum gran- 

 aria Buckton. The parasites had also increased and were very 

 abundant on the above date. A large number of parasitized 

 lice were collected in the field and many specimens of the 

 parasite reared. 



The females of this species, which were unknown to Dr. 

 Ashmead, have 16 or 17 joints in the antenna? and are almost 

 wholly black and shining like the males. The male antennae 

 may have 18, 19. 20, or 21 joints, the normal number being 19 

 as given by Ashmead. 



