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. Cerataphis Lichtenstein, Bui. Ent. Soe. 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 coecid 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 THORACAFHIS Van der Goot 
Plate XVI, N-W. 
1916. TTioracapMs 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 antennae 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), Thoracaphis arboris V. d. Goot. 
