64 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4tk Ser. 



Rhopalosiphum persicae (Sulzer) 



This species was taken on Natane-na (mustard), Brasska 

 campestris Linn., Shiga-Ken, May 2?i, 1913. Collection num- 

 ber 55. 



Rhopalosiphum, species 



Only two immature apterous females of this species were 

 received and they are in very poor condition. The color is 

 lemon-yellow with pale and dusky antennse, dark brown cor- 

 nicles and lemon-yellow cauda. Occurs on Yomena, Boltonia 

 indica Benth. (listed as Asteromcea indica Bl.), Somei, Tokyo, 

 May 10, 1913. Collection number 12. 



Siphocoryne bicaudata, new species 

 Figure 13 



Winged VIVIPAROUS females (Cotypes) — Three specimens, 

 one without antennas, the other two in fair condition. Length 

 1.25 mm., width 0.7 mm. Color not given, apparently black 

 and green. Antennas dusky to black throughout, imbricated 

 and with few hairs ; lengths of articles : I, 0.05 mm. ; II, 0.04 

 mm. : III, 0.3 mm. ; IV, 0.15 mm. ; V, 0.11 mm. ; VL 0.25 mm. 

 (base 0.11 mm., filament 0.14 mm.) ; total 0.9 mm. Sensoria 

 circular, of nearly the same size and occurring on the two 

 specimens as follows: III. 17,20: 23,24; IV. 5,3: 6,4; V, 1,1 : 

 2,2. Apical portions of the femora and tibiae and all of the 

 tarsi black, the remainder of the legs pale. Front wings 3 mm. 

 long. Abdomen just above the cauda with a distinct short 

 black horn about 0.04 mm. long. Cornicles black, imbricated, 

 swollen just beyond the middle, curved slightly outward and 

 0.2 mm. long. Cauda dark and 0.17 mm. long. 



Apterous viviparous females (Cotypes) — Ten good 

 specimens with full color notes. Length 1.8 mm., width 1 mm. 

 Prevailing color green. Body surface variolous as is charac- 

 teristic of this genus. Antennse short, pale at base and dark 

 at tip, imbricated and with few hairs ; lengths of the articles : 

 I, 0.06 mm. ; II, 0.04 mm. ; III, 0.22 mm. ; IV, 0.10 mm. ; V, 

 0.08 mm.; VI, 0.2 mm. (base 0.09 mm., filament 0.11 mm.) ; 

 total 0.7 mm. The sensorium near tip of V is noticeably large. 

 Rostrum reaching to the 2nd coxas. Abdomen terminating in 



