320 University of California Puhlications [Entomology 



cated excepting the basal fourth. The lengths of the respective 

 articles are: I 0.07 mm., II 0.06 mm., Ill 0.43 mm., IV 0.21 mm., 

 V 0.18 mm., VI 0.41 mm. (base 0.09 mm., filament 0.32 mm.), 

 total 1.36 mm. Article III is covered the entire length with 

 numerous circular sensoria of different sizes. The number varies 

 considerably, from fifteen to fifty, the average l^eing about thirty- 

 five. On article IV of a great manj^ individuals there are no 

 sensoria, while on a few the number varies from one to four. 

 There are the normal number on V and VI. The venation is 

 shown in the accompanying drawing (fig. 11, A). The ro.strum 

 is dusky and reaches slightly beyond the third coxae. The pro- 

 thorax has a distinct lateral tubercle on each side of the base. 

 The legs are transparently white or yellow with the apices of the 

 femora and tibiae and all of the tarsi dark. The abdomen is 

 3'ellow or pale yellowish green with a few darker green mark- 

 ings on the dorsum, and a distinct narrow transverse patch 

 between the cornicles, already referred to. The cornicles (fig. 

 11, D) are nearly cylindrical or with the base somewhat wider 

 than the mouth. They are black or very dark in color, imbri- 

 cated and about twice the length of the hind tarsi (fig. 11, B), 

 the length being 0.25 mm. The cauda (fig. 11, C) is much the 

 same as that of the apterous female. 



The nymphs vary from pale yellow^ to faintly yellowish-green 

 with few or no darker markings. 



HOST PLANTS, LOCALITIES, DATES AND COLLECTORS 



As previously stated this species was first taken on the native 

 wild or sweet anise, Caruni kelloggii Gray, which appears to be 

 the normal food plant. The insects feed in compact colonies on 

 the stems, usually near a fork and .sometimes entirely out of 

 sight beneath the sheath of a leaf petiole. The above infested 

 plants were apparently growing in a wild state along a creek bed 

 in Napa County near the town of Rutherford. Collected by the 

 writer on June 21, 1916. 



The second lot, consisting of but few specimens, was taken on 

 the leaves of Angelica tomentosa Wats, another native plant 

 growing in the botanical garden on the campus in close prox- 

 imity to a clump of the wild or sweet anise, which at the par- 

 ticular time showed no infestation. The specimens were collected 

 by the writer on June 27, 1916. 



