Vol. Xxix] ENTOMOLOGICAL XK\YS. 363 



"Sifoni lunghi o lunghissimi, sempre molto piu lunghi 

 della codetta. .Ma-crosiphnm Passerini." 



The species in this genus have heretofore been considered as 

 belonging to Macrosiphum, but the writer is in full accord with 

 Del Guercio in placing them in a distinct genus. 



The question was brought to the writer's attention on taking 

 specimens of M. sanbornii Gillette on chrysanthemums at Stan- 

 ford University and in Riverside. This species cannot very 

 well be placed in the genus Macrosiphum because of the short 

 bottle-shaped cornicles which are not longer than the cauda 

 (Text fig. i). It does fit the genus Macrosiphoniella of Del 

 Guercio, however. 



Van der Goot 4 adds another species, M. citricola v.d.G., to 

 this genus, making a total of twelve species. Of these, ten 

 occur in Europe, two in Australasia, and one in America. 



II. THE GENUS SIPHONATROPIIIA NOV. GEN. 



The writer has recently described an aphid from Monterey 

 and Guadalupe cypress under the name of Ccrosipha cuprcssi 

 Swain. 5 At that time he was doubtful as to its generic posi- 

 tion, so placed it provisionally in Cerosipha. Since then he has 

 had opportunity to study it further and has come to the con- 

 clusion that it does not fit into any described genus. Conse- 

 quently he proposes a new genus for the species, naming it 

 Siphonatrophla (from its atrophied cornicles). Below is a 

 brief description of the genus. 



Body of alate small and of the shape of Aphis, but the body 

 of the apterae with a very swollen and convex abdomen. Fore- 

 head flat and without frontal protuberance. Antennae short, 

 scarcely reaching to the abdomen, five- segmented, and without 

 antennal tubercles. Segments three and five subequal, and the 

 base and spur of five subequal. Body without lateral tubercles 



1 Van der Goot, P. Zur Kcnntniss der Blattlause Java's. Contrih. 

 a la Fauna des Indes Neerlandaises, i : 34. 1917. 



5 Swain, A. F. New .Ipliididac from California. Trans. Amer. Ent. 

 Soc. 44: 19-22. 1918. 



