EvERARD E. Bt.ANCHARD : Aphíd HOtúS l85 



3. Comióles more or less equal in length Lo thc cauda. 



Macrosiphóniella 

 Cornicles very long, much longer than cauda Macrosiphum 



!\. Apterous virgogene with III provided with subcircular sensoria. 



Aulacorthum 



Apterous virgogene wilhoul sensoria 011 III. 5 



5. Head and basal anlennal segments provided with very prominent ca- 



pitate hairs. Capilophorus 



Head and basal anlennal segments without prominent capitate 



hairs. 6 



«6. Anal píate distinctly triangular Neomyzas 



Anal píate sub-quadrangular. Myzus 



Genus MACROSIPHUM (Pass.) 



The species dealt with may be separated by the folio wing key : 



Apex of cornicle with distinct polygonal recticulations. 2 



Apex of cornicles smooth. M. urticae (Schrxr.) 



Sensoria on III of álate virgogene confined to a more or less single 



row. . M. solanifolii (Ashm.) 



Sensoria on III of álate virgogene not confined to a single row. 3 

 3. Cauda approximately 2/3 as long as cornicles. 



M. lízerianum Blxchd 

 Cauda approximately 1/2 as long as cornicles. 4 



4- Recticulated área of cornicle approximately i/4 its length. 



M. sonchi (L.) 

 Recticulated área of cornicle approximately 1/8 its length. 



M. rosne (L.) 



Macrosiphum lízerianum n. sp. (fig. 1) 



Apterom virgogene. 



Color : Bocly shining to dull brick red or reddish brown, with 

 a black spot just behind the origin of each cornicle. Eyes blackish. 

 Antennae blackish, with the extreme base of III yellowish. Femora 

 blackish with the basal half paler to yellowish. Tibiae brownish, 

 shading to blackish towards tip. Tarsi and cornicles, blackish. 

 Cauda clear yellowish with the extreme tip darkened. Genital píate 

 somewhat darkened. Beak dark, with last two segments more intense. 



