34 BULLETIN 826, U. S. DEPARTMENT OF AGRICULTURE. 
In I860 Passeriiii used acens L. as the type of Chaitophorus and 
this placing has often been followed, but that of Gerstaeeker has 
priority. 
Characters. — Cornicles present, truncate, rather prominent. Antennte of six seg- 
ments, armed with subcircular sensoria and rather prominent hairs. Fore wings with 
the media normally twice branched, hind wings with both media and cubitus piesent. 
Cauda distinctly knobbed. Anal plate entire, sometimes somewhat indented. Sex- 
ual forms not differing markedly from the viviparous ones. Males winged, as a rule, 
but sometimes intermediate or apterous. Oviparous females apterous with the ovaries 
normally developed and producing several eggs. Both sexes feeding. 
Forms living usually upon the leaves of trees; no dimorphic forms developed. 
Type (fixed by Gerstaeeker, 1S56\ Aphis populi L. 
Genus PATCHIA, n. gen. 
Characters. — Cornicles truncate: antennae of six segments, hairy and with circular 
sensoria. Fore wings with the media twice branched, the radial sector absent or 
faintly indicated; hind wings with both media and cubitus present. Cauda rounded 
or slightly conical; anal plate divided into two separate parts. 
Type, Patchia virginiana P>aker. 
Patckia virginiana, n. sp. 
Mate viviparous female. — Antennae as follows: III, 0.48 mm., with an even row of 
about 12 subcircular sensoria; IV, 0.288 mm.; V, 0.24 mm.; VI (0.16-0.192 mm. . 
Color brown with a large black patch on dorsum of abdomen and with lateral patches 
of same color. Y\ T ings with the radial sector absent and the veins heavily bordered. 
Apterous form almost solid velvety black. Both forms secreting wax. ■ 
Found on the bark of chestnut at East Falls Church, Va. The type is in the U. S. 
National Museum (Cat. Xo. 23063V 
Genus PERIPHYLLTJS Van der Hoeven. 
Plate IV, A A, BB. 
1852. PTiiUophorus Thornton, Proe. Ent. Soc. London, n. s., v. 2, p. 78. 
1858. Chelymorpha Clark, The Microscope. 
1863. Periphyllus Van der Hoeven, Tijd. voor. Ent.,, v. 6, p. 7. 
1913. Chaitophorinclla Van der Goot, Tijd. voor Ent., v. 56, p. 150. 
1917. Arakawana Matsumura, Journ. Coll. Agr. Tohoku Univ., v. 7, pt. 6, p. 375. 
In 1852 Thornton used the name Phillophorus with \ns> testudinatus 
as type. This name had, however, been used in 1840. Koch erected 
the genns Chaitophorus m 1854 and included therein a number of 
species. In 1856 Gerstaeeker set ApMs populi L. as the type of 
Chaitophorus and therefore prevented the use of the name for spe- 
cies such as testudinatus unless all of Koch's species are included. 
In 1858 Clark used the name Chelymorpha with the specific name 
phyUophora. The species he discussed is the testudinatus of Thorn- 
ton. The generic name Chelymorpha, however, was used as early 
as 1834 and, therefore, is not available. In 1863 Van der Hoeven 
employed the generic term Periphyllus with his species testudo as 
type. This name is a synonym of testudinatus Thornton, and the 
generic name seems to be the first one available. 
In 1913 Van der Goot employed the generic name Chaitophorinella 
with testudinatus as type, and this name, therefore, will become a 
synonym of Periphyllus. 
