134 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 7 



(Siphocoryne conii Davidson "Notes on the Aphididse in the vicinity 

 of kStanford University;" Journal Econ. Ent. August, 1909). Close 

 examination of specimens coupled with field observations have satis- 

 fied me that the species on Conium maculatum described by me as 

 new is identical with the European honey-suckle louse. 



Rhopalosiphum nervatum Gillette. A very abundant rose louse at 

 Walnut Creek, Cal., attacking both wild and cultivated roses. I 

 am indebted to Prof. C. P. Gillette for the determination of this 

 species. 



Rhopalosiphum corylinum sp. nov. 



Winged viviparous female: General color, apple green; head and thoracic lobes, 

 dark green; the former, with a brownish tinge; pro thorax, darker than abdomen, 



but not so dark as head and thoracic lobes; 

 scutellum, dark green; antennse, longer than 

 the body, on frontal tubercles, dusky green; 

 joints I, II and extreme base of III, pale 

 green; eyes, dark red; wings, of moderate 

 size, venation normal; stigma, long and 

 narrow, pale greyish-green; veins, dark 

 browTi; legs, pale green; femoral and tibial 

 apices and tarsi, dusky grey; cornicles, nearly 

 one-third the length of the body, slightly 

 enlarged at distal two-thirds, base, pale; 

 apical, two-thirds dusky; cauda tapering, 

 the apex upturned, pale green; beak, reaches 

 beyond second coxse. Sensoria: Joint III, 

 twenty-four to thirty, small, disposed along 

 almost the entire length of the joint, circular; 

 usual apical ones on joints V and VI. 

 Measurements: Body, length, 2.16mm.; body, 

 wddth, .83mm.; cornicles, .63mm.; cauda, 

 .19mm.; antennse. III, .80mm.; IV, .47mm.; 

 V, .50mm.; VI, .14.3mm.; filament, .83mm. 

 Described from many individuals. 



The pupa, winged viviparous female: Pale 

 green with a dorsal longitudinal stripe of 

 darker green; antenna;, as long as body; artic- 

 ulations and whole of joints VI and filament 

 dusky; elsewhere pale greenish-white; head, 

 dark green; wing-pads, white; abdomen, often 

 with orange-colored areas; cornicles, slightly 

 thickened at distal two-thirds, pale gi-eenish-white ; legs, white; tarsi, dusky; cauda, 

 pale, conical. Length of body, 2.44mm.; cornicles, .57mm. Described from numerous 

 specimens. The apterous form is pale greenish-white. 



This species infests the under side of the leaves and the terminal 

 shoots of wild hazelnut {Corylus rostrata Ait.). Collected May 20, 

 1913, near Walnut Creek, Cal. 



m 



Fig. 6, Rhopalosiphum corylinmn; 

 winged viviparous female; 15, an- 

 tenna; 16, cornicle; 17, cauda 

 (from side). 



