OF WASHINGTON, VOLUME XII, 1910. 187 



Myzus ribis is now known to be common to both Europe and 

 America. In 1901, Dr. Ashmead described a parasite of the 

 currant aphis reared by Dr. Dimrnock, of Cambridge, Massa- 

 chusetts, and gave to it the name of Aphidius ribis, having 

 evidently overlooked Haliday's preemption of the name. 



The writer reared several hundred specimens of Aphidius 

 from the currant aphis and readily identified them as iden- 

 tical with Ashmead's types. Upon comparison with the de- 

 scription by Haliday they were found to fit that description 

 perfectly. In order that there should be no mistake, however, 

 specimens were sent to Mr. Morley, who kindly compared 

 them with Haliday's types, and he pronounced them identical 

 with that species. The species should therefore be known as 

 Aphidius ribis Hal. 



Aphidius rosae Haliday. 



Aphidius rosx Haliday, Entom. Magaz., I, 1883, p. 261. 

 Aphidius rosae (Hal.) Marshall, Trans. Ent. Soc. London, 1899, 

 p. 43. 



Eighteen specimens of Aphidius were reared from the com- 

 mon aphis of the garden rose {Macrosiphum rosce). They 

 agreed very closely with the description of A. rosa Hal., a 

 parasite of an aphis infesting roses in Europe. Haliday's 

 species is credited by Marshall with 17 and 18 jointed anten- 

 nas in the female and 20-jointedin the male, while these speci- 

 mens showed females with 18 and 19 and males with 20, 21, 

 and 22 jointed antennae. Haliday's species is described as 

 having the abdomen of the females with segments 2 and 3 

 and sometimes 4 and 5 dusky on each side in the form of 

 interrupted bands or with two rows of spots which are variable 

 in intensity. The males are described as having the abdomen 

 brown. In my specimens the female abdomens vary from uni- 

 formly dark brown, except the petiole, to light brown on the 

 sides, with a yellowish streak down the middle. The males 

 have the abdomens brown, as described by Haliday. Consid- 

 ering the fact that the rose aphis is common to both continents 

 and the close resemblance of my specimens to the description 

 of Haliday's species, I had little hesitation in believing that 

 they were the same species, but sent specimens to Mr. Morley 

 for comparison with the types. As in the case of . \phidins 

 ribis Hal., he confirms the determination. The metathorax 

 of this species is distinctly carinate, a fact not mentioned by 

 either Haliday or Marshall. 



