364 ENTOMOLOGICAL NEWS. [Dec., 'l8 



on prothorax or abdomen. Legs normal in alates, but short 

 and stout in apterae. Cornicles merely pores, with the opening 

 broader than long, slightly flanged near the mouth. Cauda of 

 alates long and ensiform or triangular, of apterae short and 

 conical. Anal plate distinct and fairly conspicuous, broadly 

 rounded. Rudimentary gonapophyses two. Wings long and 

 slender, being much longer than the body, and with an Aphis- 

 like venation, in which the second branch of the third discoidal 

 is nearer to the tip of the wing than to the base of the first 

 branch. 



Type: Cerosipha cit'prcssi Swain, on Cuprcssiis guadalu- 

 pensis and C. macrocarpa, Riverside and San Diego counties, 

 California. This species lives singly on the tips of the leaves of 

 cypress. The alates are very rare, which facts seems to indi- 

 cate an alternation of host plants. The alternate host, if any, 

 is unknown. 



This genus is somewhat similar to Slpha Passerini and to 

 Cerosipha Del Guercio, especially in the five-segmented an- 

 tennae and the aphidine venation. In Cerosipha Del Guercio 

 the cornicles are longer, while in Sipha Passerini the cauda is 

 knobbed and the body flat and covered with long fine hairs. 

 In venation it resembles Aphis padi Linn, and ApJiis pruni- 

 foliae Fitch. The cauda reminds one of Siphocoryne Passerini 

 or Mysus Passerini. In Wilson's keys to the Aphidini 6 , this 

 falls into either Brachycolns Buckton or Crvptosiphutn Buck- 

 ton. From both it differs in the five-segmented antennae. The 

 short pore-like cornicles and the shape of the body separate it 

 from the former, and the shape of the cauda from the latter. 

 From Setaphis v.d.G. 7 . which it resembles somewhat super- 

 ficially, it differs in lacking the "Siphunculoidae" and in the 

 typical Aphis venation with the twice-branched cubital vein. 



i. Cornicles cylindrical and as broad as long. Body slender 



Brachycolns Buckton. Type: Aphis stcllariae Hardy. 



6 Wilson, H. F. A key to the genera of the subfamily Aphidinae 

 and notes on synonomy. Annals Ent. Soc. Amer., 3: 321-322. 1910. 



7 Van der Goot, P. Zur Kenntniss der Blattlause Java's. Contrib. 

 Fauna des Indes Neerlandaises, i : 153. 1917. 



