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PEOGEEDINGS OP THE NATIONAL MUSEUM 



VOL. 67 



Amj)horophora and the Macrosiphum as Passerini and Sanderson 

 have pointed out. He described two or more species with both 

 swollen and slender cornicles as varieties, calling the species Aphis 

 lactucae Linnaeus and cited both Linnaeus and Kaltenbach. 



Koch under the name of Rhopalosiphum rihis Linnaeus seems to 

 confuse two species on Rihis, describing and figuring one with swollen 

 cornicles and also speaking of the pseudogalls of Myzus rihis Linnaeus. 



Buckton follows Koch in calling the winter form Rhopalosiphum 

 rihis Linnaeus but figures the typical pseudogalls of Myzus rihis 

 Linnaeus. He calls the summer form Rhopalosiphum lactucae 

 Kaltenbach. 



Van der Goot refers the species to Rhopalosiphum rihis Linnaeus. 

 Both he and Buckton also have Myzus rihis Linnaeus. 



Three names have then been applied to this species— rihis Lin- 

 naeus, lactucae Linnaeus, and lactucae Kaltenbach. Aphis rihis 

 Linnaeus is accepted to be Myzus rihis Linnaeus. Aphis lactucae 

 Linnaeus is a Macrosiphum. Aphis lactucae Kaltenbach is a 

 homonym of Aphis lactucae Linnaeus, and can not be used. A new 

 name is therefore necessary and the name cosmopolifana is here 

 proposed. 



This species seems to have very close relatives, both on currant 

 and on its summer hosts. On currant I am describing in this paper 

 pergandei, new species. On Sonchus there are several forms as 

 discussed on page 4. 



Apterous spring form on Rihes. — Antennae shorter than body, 

 light colored, not conspicuously imbricated, hairs inconspicuous, 

 much shorter than width of segment, III with 1-3 small sensoria at 

 base. Antennal tubercles of moderate size. Beak reaching between 

 second and third coxae. Cornicles short, thick, plainly swollen, the 

 tips darker and imbricated. The cauda narrow, strongly constricted 

 in some specimens, less so in others, three sets of lateral hairs. 



