46 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 67 



The last instar nymph of the apterous viviparous female measures, 

 as follows : 



Alate male. — Antennae slightly more than one and one-half times 

 as long as body, imbricated especially beyond III, inner side of I 

 gibbous, III 0.608 mm. long with 30 sensoria, IV 0.512 mm. long 

 with 16-17 sensoria, V 0.464, mm. long with 12-14 sensoria, base of 

 VI 0.144 mm. long, unguis 0.792 mm. long. Antennal tubercles mod- 

 erate in size. Head 0.416 mm. across eyes. Cornicles 0.624 mm. 

 long, widest diameter 0.064 mm., smallest diameter 0.040 mm., flange 

 0.048 mm. wide, conspicuously imbricated, not reticulated. From 

 one metatype specimen on rose at Fort Collins, Colo., November 3 

 1914. 



Biology. — In California this species seems to migrate between rose 

 and Arbutus. The only transfer was made by Swain. I agree with 

 him and with Essig that arhuti Davidson from Arbutus seems to be 

 structually the same as nervata Gillette on rose. The writings of 

 Davidson and Gillette would indicate that the species may be found 

 throughout the year on either plant. 



Host plants. — Rose, Arbutus menzeisii, Arbutus unedo Linnaeus, 

 Photinia arbutifolia and Arctostaphylos manzanita Parry. 



Distribution. — Colorado and California. 



Cotypes. — Specimens of nervata Gillette are in the collection of 

 the U. S. National Museum, Cat. No. 26855, in the Colorado Agri- 

 cultural Experiment Station, and in the Maine Agricultural Experi- 

 ment Station. Those of arbuti Davidson are in the U. S. National 

 Museum and in the collection of Davidson. 



AMPHOROPHORA OLERACEAE (Van der Goot) 



Figs. 49-54 



Rhopalosiphum lactucae (Kaltenbach) Maki, Bull. Agr. Exp. Sta. Formosa 

 No. 103, 1913, p. 22. 



Rhopalosiphum oleraceae van deu Goot, Zur Kenntniss der Blattlause 

 Java's 1917, p. 40. 



Amphorophora oleraceae (Van der Goot) Takahashi, Aphididae of Formosa, 

 pt. 1, Form. Agr. Exp. Sta. 1921, p. 28; Rev. Form. Agr., no. 182, 1921, p. 63. 



Amphorophora sonchifoliae Takahashi, Aphididae of Formosa, pt. 2,. 

 Rept. Agr. Gov. Res. Inst. Formosa, no. 4, 1923, pp. 31 and 84. 



This species is very close to cosmopolitana and is found on the same 

 summer hosts. It can be distinguished by the larger number of 

 sensoria, especially in the apterous form. The sensoria are not quite 



