46 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Macrosiphum ibotum, new species 

 Figure 3 



Winged viviparous female (Tyi^e) — Selected from 12 

 individuals in good condition. Length 2 mm., width (of a 

 paratype) 0.9 mm. General color pale green. Antennae black 

 throughout excepting I and II which are dusky, with few hairs, 

 and imbricated; lengths of the articles: I, 0.12 mm.; II, 0.09 

 mm.; Ill, 0.71 mm.; IV, 0.58 mm.; V, 0.51 mm. ; VI, 1.67 

 mm. (base 0.17 mm., filament 1.5 mm.) ; total 3.68 mm. Sen- 

 soria of article III circular, about the same size, almost in a row 

 and 16 in number. Paratypes show a variation in number from 

 13 to 16. Sensoria on other articles normal. Rostrum reaching 

 nearly to the 3rd coxae. Prothorax yellowish, the remainder 

 of the thorax dark. Legs yellow, with the distal ends of the 

 femora and tibise and all of the tarsi black. Front wings 3 mm. 

 long. Cornicles dark, imbricated throughout, 0.42 mm. long 

 (of a paratype 0.52 mm. long). Cauda dark, 0.23 mm. long. 



Apterous viviparous females (Paratypes) — Seven indi- 

 viduals in good condition. Average length 1.8 mm., width 1 

 mm. Prevailing color pale green. Antennae dark, except I, II 

 and the base of III ; imbricated, with a few short hairs ; lengths 

 of articles : I, 0.15 mm. ; II, 0.07 mm. ; III, 0.77 mm. ; IV, 0.61 

 mm. ; V, 0.51 mm. ; VI, 1.45 mm. (base 0.15 mm., filament 1.30 

 mm.) ; total 3.56 mm. Sensoria small, circular, normal on V 

 and VI; varying from none to 3 on III, and confined to the 

 base. Rostrum pale, reaching nearly to the third coxae. Ab- 

 domen pale, with darker green spots on the dorsum. Cornicles 

 black, finely imbricated throughout, 0.53 mm. long. Cauda 

 pale, 0.32 mm. long. 



Nymphs — Paler in color than the adults with the winef- 

 pads dusky. 



Host plant — On the undersides of the leaves of Ibota, 

 Ligustriim ibota Sieb. 



Locality — Nakano, Tokyo. 



Date of collection — May 25, 1913. 



Collection number — 59. 



