GENERIC CLASSIFICATION OF APHIDIDAE. 87 



Genus CERATAPHIS Lichtenstein. 

 Plate XVI, F-M. 



1862. Boisduvalia Signoret, Ann. Ent. Soc. France (4), v. 8, p. 400. 

 1882. Ccrataphis Lichtenstein, Bui. Ent. Soc. France (6), v. 2, p. xvi. 



Signoret erected his genus Boisduvalia in connection with his 

 aleyrodid monograph. He placed Coccus lataniae Bois. as type. 

 Later, however, he considered this a coccid genus. The name was 

 used in the Diptera in 1830, and is therefore not available. The 

 name Cerataphis used by Lichtenstein in 1882 appears as the next 

 name applied to the genus. 



Characters. — Cornicles present as mere rings. Apterous form with four-segmented 

 antennae and aleyrodiform, with two divisions to the body; wax glands prominent; 

 vertex with two hornlike projections; alate form with five-segmented antennae, the 

 segments armed with narrow annular sensoria. Fore wings with the media once 

 branched, hind wings with both media and cubitus present. Cauda knobbed; anal 

 plate bilobed. 



Type (monotypical), Coccus lataniae Bois. 



Genus THORACAPHIS Van der Goot 



Plate XVI, N-W. 

 1916. ThoracapMs Van der Goot, Zur Kenntniss der Blattlause Java's, p. 242. 



Only the apterous form of one species of this genus has been 

 described. Other species, however, are available for study, through 

 the generosity of Professor Van der Goot. 



Characters. — Cornicles present and quite distinct, occasionally absent, however, 

 in the apterous form. Apterous form with three-segmented antennae, flat and with a 

 posterior lobe. Alate form with five-segmented antennas armed with annular sen- 

 soria. Fore wings with the media once branched ; hind wings with both media and 

 cubitus present. Cauda somewhat knobbed, anal plate bilobed. 



Type (monotypical), ThoracapMs arboris V. d. Goot. 



