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JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 3 



R. diantJd but closer examination showed it to be R. lactucce, an 

 European form lately reported from America, (Canadian Entomolo- 

 gist, Vol. XXXIII, No. 3, 1901. E. D. Sanderson). Taken sparingly 

 on Sonchus oleracea. 



RJiopalosiphuni herheridis Kalt. I took the oval, black eggs in 

 January on the stalks of barberry (Berberis vulgaris). At this time 

 oviparous females were still producing eggs. Eggs hatched from 

 January 20 on, producing almost entirely apterous forms. By April 

 winged and wingless viviparie were abundant on the under side of 

 the leaves. - 



Rliopalosipluim dianthi Schrank. This species is abundant on sev- 

 eral plants in Santa Clara County. Among its hosts are Groundsel 

 (Sene.C'io vulgare), Sonchus oleracea and >S^. asper, celestial pepper, 

 forget-me-not (Cyanoglossum) , and Amsinkia. I have bred several 

 parasites from R. dianthi, among these a minute wingless dipterous 

 insect. 



Fig. 29. Rhopalosiphum arhiiti. Alate female; a, wing; b, antenna; c, 

 head; e, cornicle;' g, eauda; d, cornicle of young; f, cornicle, and h, cauda 

 of apterous female (original). 



Rhopalosiphum arhuti sp. nov. Alate male. Length of body, 1.8 

 mm. Breadth of body, .48 mm. Wing expanse, 6.1 mm. Cornicles, 

 .50 mm. Antennae — III, 52 mm. ; IV, .40 mm. ; V, .35 mm. ; VI, .12 

 mm. ; VII, 1.05 mm. General color reddish-yellow, newly emerged 

 individuals pale green throughout. Antennas on small frontal tuber- 

 cles, half as long again as the body, dusky except joints I and II and 

 base of III. Seventh joint much the longest, exceeding third and 

 fourth together, very fine. Joints III and IV with numerous small 

 sensoria. Eyes red. Head, prothorax, thoracic lobes, scutellum pale 

 brown. Pale part of prothorax and abdomen yellowish-brown, latter 

 with several undefined dusky bars on the dorsum and with dusky 

 lateral spots and blotches. Abdomen broadest just anterior to the 



