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



In 1860 Passerini used aceris L. as the type of Chaitophorus and 

 this placing has often been followed, but that of Gerstaecker has 

 priority. 



Characters. — Cornicles present, truncate, rather prominent. Antennae 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 Gerstaecker, 1856), Aphis populi L. 

 Genus PAT CHI A, 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 Baker. 



Patchia virginiana, n. sp. 

 -Alate 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. Wings with the radial sector absent and the veins heavily bordered. 

 Apterous form almost solid A^elvety 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. No. 2306?-). 



Genus PERIPHYLLUS Van der Hoeven. 



Plate IV, A A, BB. 



1852 

 1858 

 1863 

 1913 

 1917 



PhillopTiorus Thornton, Proc. Ent. Soc. London, n. s., v. 2, p. 78. 



Chelymorpha Clark, The Microscope. 



Periphyllus Van der Hoeven, Tijd. voor. Ent., v. 6, p. 7. 



Chaitophorinclla Van der Goot, Tijd. voor Ent., v. 56, p. 150. 



Arakawana Matsumura, Journ. Coll. Agr. Tohoku Univ., v. 7, pt. 6, p. 375. 



In 1852 Thornton used the name Phillophorus with his testudinatus 

 as type. This name had, however, been used in 1840. Koch erected 

 the genus Chaitophorus in 1854 and included therein a number of 

 species. In 1856 Gerstaecker set Aphis 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 

 pJiyllopliora. 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. 



