18 BULLETIN 826, IT. S. DEPARTMENT OF AGRICULTURE. 



very large, one of the largest aphids. Del Guercio set no type 

 for his subgenus which was published shortly after Wilson's. 

 Wilson placed this species as a synonym of caryae Harris which he 

 made the type of Longistigma. 



Characters. — Size large. Head somewhat divided. Eyes large, with distinct 

 ocular tubercles. Antennae of six segments, armed with sub-circular sensoria and 

 prominent hairs. Fore wings with media twice branched, radial sector not a great way 

 from the tip of wing and stigma extending aroiind almost to tip; hind wings with both 

 media and cubitus present. Cornicles on broad, shallow, hairy cones. Cauda and anal 

 plate somewhat rounded. 



Oviparous female apterous. Males winged.' 



Type (monotypical), Aphis caryae Harris. 



Genus PTEROCHLORUS Rondanl. 



Plate II, S-X. 



1848. Pterochlorus Rondani, "Familia Heinipterorum Aphidinge'! in Kuovi Annali delle Scienze 



Naturali, p. 35. 

 1855. Dryobius Koch, Die Pflanzenlause Aphiden, p. 225. 



1908. Tuberolaclinus Mordwilko, Ann. Mus. Zool. de 1'Acad. Imp. des Sci. St. Petersbourg, v. 13, 

 p. 374. 



1909. JDryapMs Del Guercio, Redia, v. 5, p. 262. 



1913. Schizodryobius Van der Goot, Tidj. voor Ent., v. 56, p. 130. 



1917. Pterochlorides Archangelsky, Turkestan Ent. Stn. Rept. Tashkent. 



1918. Tuberodryobius Das, Mem. Ind. Mus., v. 6, p. 259. 



The generic name Cinaria was used for Aphis pini L ?, and Aphis 

 roboris L. with A. pini as type. In the writer's opinion Cinaria can 

 not be used now with roboris as type. Roboris was used as the type 

 of Dryobius, therefore this name is clear. Dryaphis was used with 

 Pterochlorus as a synonym but the name as a generic name was really 

 first used by Del Guercio in 1909. Tuberolachnus was erected in 

 1908 with viminalis Boyer as type but the difference hi the abdominal 

 tubercle is not, in the writer's opinion, sufficient for a distinction. 

 Van der Goot's genus is plainly a synonym. The other two generic 

 names listed were used with Lachnus persicae Choi, as type. This 

 species has several abdominal dorsal tubercles but for the same reason 

 as Tuberolachnus is held to be a synonym. 



Characters. — Head somewhat rounded. Antennae of six segments, armed with 

 subcircular sensoria and prominent hairs. Fore wings with radial sector distinctly 

 curved, inserted some distance from tip; media twice branched. Hind wings with 

 both media and cubit as present. Wings often banded or mottled, cornicles on hairy 

 cones. Cauda and anal plate rounded. Abdomen sometimes with dorsal tubercles. 

 Typ e (fixed by Rondani. 1848), Aphis roboris Fab. (=roboris L.). 



Genus STOMAPHIS Walker. 



Plate II, M-R.. 



1870. Stomaphis Walker, The Zoologist, v. 28, p. 2000. 

 1881. Rhynchocles Altum, Forst Zool., v. 3, p. 356. 



Of the five species originally in the genus Lachnus the species 

 quercus Linn, was removed by Walker as the type of his genus Stoma- 

 phis. Little confusion has arisen in regard to this species. Altum's 

 genus was erected for Rhynchocles longirostris. 



