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



Characters. — Cornicles present as mere rings. Antennae of five segments armed 

 with annular sensoria. Fore wings with the media simple, hind wings with two oblique 

 veins. Cauda rounded, anal plate somewhat bilobed. Sexes not known. 



Forms causing galls upon plants, the galls usually armed with numerous long pro- 

 jections. 



Type (fixed by Matsumura, 1917), Mansahia miyabei Mats. 



Genus OREGMA Buckton. 



Plate XV, A-G. 



1893. Oregma Buckton, Ind. Mus. Notes, v. 3, p. 87. . 



1897. Ceratovacuna Zehntner, Mededl. Proefs. Java, n. s., no. 37, p. 29. 



In 1893 Buckton established his genus Oregma with hambusae 

 Buckton as type, while in 1897 Zehntner established his Ceratovacuna 

 with lanigera Zehntner as type. Specimens of both of these species 

 sent by Zehntner and specimens of bamhusae from Green taken in 

 Ceylon show that these genera must be considered the same. 



Characters. — Both alate and apterous forms with two hornlike projections on the 

 vertex, wax gland areas present; antennae five-segmented, those of the alate form 

 with narrow annular sensoria; cauda rounded or somewhat knobbed; fore wings with 

 media twice forked, hind wings with both media and cubitus present; cornicles broad, 

 slightly elevated rings. 



Type (monotypical), Oregma bamhusae Buckt. 



Tribe CERATAPHIDINI. 



This tribe is closely related to the Hormaphidini but differs in that 

 very distinct cornicles are here present. The apterous forms are 

 scalelike and quiescent and feed upon the surfaces of the leaves. 

 The alate forms possess annular sensoria. Wax secretion is abundant. 



The genera may be separated as follows: 



Key to the Genera op the Cerataphidini. 



Antennae of the aleyrodiform generations of five segments . .' Aleurodaphis. 



Antennas of the aleyrodiform generations of four segments Cerataphis. 



Antennae of aleyrodiform generations of three segments Thoracaphis. 



Genus ALEURODAPHIS Van der Goot. 



Plate XVI, A-E. 

 1916. Aleurodaphis Van der Goot, Zur Kenntniss der Blattlause Java's, p. 239. 



This genus was erected for one species occurring in Java. 



Characters. — Form flat, aleyrodiform, three distinct divisions evident; cornicles 

 present as mere rings. Margin with wax secreting glands; dorsum also with many 

 small glands. Cauda rather elongate and knobbed, anal plate bilobed. Antennae 

 ' five-segmented; eyes of the apterous forms with three facets. 



Type (fixed by Van der Goot, 1916), Aleurodaphis blumeae V. d. Goot. 



