Vol. XXX I ENTO.MOLO<;iCAL NEWS. 39 



A New Genus and Species of Aphid (Hem., Horn.). 



By H. F. WILSON, University of Wisconsin, Madison, Wis- 

 consin, and J. J. DAVIS, U. S. Bureau of Entomology, 

 \Y. Lafayette, Indiana. 



Descriptions made from specimens collected on choke cherry 

 (Prunus serotina) at Portage and Madison, Wisconsin, dur- 

 ing June and July, 1916 and 1918, respectively. Found in 

 colonies at the tips of the twigs where the forms were noticed 

 in early June but no alate specimens could be found until 

 July 6. The sexual forms were also collected on Prunus, 

 September 8, 1912, at Prairie du Chien, Wisconsin. This 

 species is quite distinct from other species found on Prunus 

 spp. because of missing nectaries, although all the other 

 characters are typical of the genus Aphis. 



ASIPHONAPHIS new genus. 



Antennae with six segments and wing venation and cauda 

 as in Aphis. The character which makes it distinct from 

 Aphis is the lack of visible nectaries. The male as well as 

 the oviparous female is apterous. 



Type : Asiphonaphis pritni n. sp. 



Asiphonaphis pruni new species. 



Apterous viviparous female. General color whitish green with bands 

 of dark green, extending across the abdomen. There are about eight 

 distinct bands on the abdomen and two more or less indistinct marks 

 between the thoracic segments. The bands on the abdomen are en- 

 Jarged in the middle and at both ends. The enlarged areas in the 

 center are angular, while those on the ends are rounded. In the center 

 of each end spot a light spot can be seen which is the opening to the 

 spiracle. In the older individuals the central group of spots are more 

 or less confluent and form a longitudinal stripe extending the length 

 of the abdomen. The last three cross bands show a series of white 

 spots regularly placed either four or six in the first band and four in 

 last. 



Antennae light at the base and dusky to black at the tip. Legs, ex- 

 cept the knees and tarsi, light colored. Antennae with six segments, 

 the spur of the sixth being slightly longer than the third. The apterous 

 forms producing the sexes in the fall usually have the third and fourth 

 antennal segments coalesced. 



