46 BULLETIN 826, U. S. DEPARTMENT OF AGRICULTURE. 



Characters. — Head without prominent antennal tubercles. Antennae of five or six 

 segments armed with subcircular sensoria. Venation of the fore wings normal; hind 

 wings with the cubitus absent; cornicles elongate, slightly swollen near the distal 

 extremity, but without a prominent neck near the proximal end. Cauda rather 

 broadly conical. 



Type (monotypical), Carolinaia caricis Wlsn. 



Genus CAVARIELLA Del Guercio. 



Plate VI, X-Z. 



1911. Cavariclla Del Guercio, Redia, v. 7, p. 323. 



1914. Corynosiphon Mordwilko, Faune de la Russie-Insecta, Aphidodea, p. 73. 



1917. Nipposiplium Matsumura, Journ. Coll. Agr. Tohoku Univ., v. 7, pt. 6, p. 410. 



Two new genera were erected in recent years: One by Del 

 Guercio, Cavariella, with pastinacae L. as type; the other by 

 Mordwilko, called Corynosiphon, but with no species definitely 

 given. In a footnote, however, Mordwilko refers capreae Fab. to 

 his Corynosiphon. Both of these genera, therefore, were used for 

 insects of the same general type. This may be said too of 

 Nipposiphum. 



Characters. — Head without distinct antennal tubercles; antennae of six segments, 

 armed with prominent sensoria. Wing venation normal. Cornicles somewhat swollen 

 near the distal end; cauda rather elongate, somewhat conical; abdomen with a tubercle 

 or horn above the cauda, this tubercle or horn most prominent in the apterous form. 

 Males winged; oviparous females usually apterous. 



Type, Aphis pastinacae L. 1 



Genus CEROSIPHA Del Guercio. 



1900. Cerosipha Del Guercio, Nuove Rel. Staz. Firenze, ser. 1, no. 2, p. 116. 



1918. Metaphis Matsumura, Trans. Sapporo Nat. Hist. Soc, v. 7, pt. 1, p. 1. 



The genus Cerosipha Del Guercio was erected for a species, pas-' 

 seriniana Del Guercio, somewhat similar to Aphis but with five seg- 

 ments to the antennae. The writer has been unable to study the type 

 species and has based his remarks on rubifolii Thomas, an American 

 species. 



Characters. — Head without prominent antennal tubercles; antennae of five segments, 

 Aphis-like, armed with subcircular sensoria. Fore wings with the media twice 

 branched, hind wings with both media and cubitus present. Cornicles cylindrical or 

 somewhat tapering, cauda Aphis-like, somewhat tapering. 



Type (monotypical), Cerosipha passeriniana Del G. 



Genus CRYPTOSIPHUM Buckton. 

 Plate VI, PP, QQ. 

 1879. Cryptosiphum Buckton, Mon. Br. Aphides, v. 2, p. 144. 



The genus Cryptosiphum Buckton can be distinguished from others 

 having very short cornicles by the cauda which is here short and 

 rounded, while in most other cases it is very long. 



Characters. — Head without distinct antennal tubercles. Antennae of six segments, 

 rather short, and with subcircular sensoria. Fore wings with the media either once or 

 twice branched. Hind wings with both media and cubitus present. Cornicles sub- 



1 The writer has a record to the effect that in a published paper Del Guercio used pastinacae as type 

 of Cavariella, but he has been unable to locate the publication and can not reach Doctor Del Guercio 

 through the mails. 



