50 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser, 



Macrosiphum nishigaharae, new species 



Figure 5 



Winged viviparous female (Type) — From four imperfect 

 specimens. Length 1.75 mm., width 0.8 mm. Prevailing color 

 shiny dark purple-lake to black. Antennae with fairly long 

 knobbed hairs, imbricated towards the tips ; black, except basal 

 half of III which is pale brown; lengths of the articles : I, 0.11 

 mm. ; II, 0.08 mm. ; III, 0.6 mm. ; IV, 0.38 mm. ; V, 0.35 mm. ; 

 VI, 0.73 mm. (base 0.13 mm., filament 0.6 mm.) ; total 2.25 

 mm. Sensoria on III circular, of different sizes and scattered, 

 26 (left) and 28 (right). On the paratypes the number varies 

 from 29 to 32. On IV 8 (left) . On the paratypes from 3 to 9. 

 The usual number on V and VI. Rostrum dark, extending to 

 the 3rd coxae. Thorax shiny black, with small lateral prothor- 

 acic tubercles. Legs black with the base of the femora and 

 middle of the tibiae pale. Front wings 2.6 mm. long. Abdomen 

 dark shiny purple or black. Cornicles short, black, somewhat 

 constricted beyond the middle, basal third imbricated, remain- 

 der reticulate, 0.26 mm. long. Cauda black, slightly longer 

 than the cornicles or 0.29 mm. 



Apterous viviparous females (Paratypes) — Selected 

 from ten specimens. Average length 1.6 mm., width 0.8 mm. 

 Prevailing color from shiny carmine to dark purple-lake or 

 black. Antennae black except the basal two-thirds of III, with 

 numerous knobbed hairs ; lengths of articles : I, 0.08 mm. ; II, 

 0.08 mm. ; III. 0.58 mm. ; IV, 0.41 mm. ; V, 0.31 mm. ; VI, 0.61 

 mm. (base 0.12 mm., filament 0.49 mm.) : total 2.07 mm. The 

 sensoria on III are circular, of different sizes, confined in a row 

 to the middle region or along the entire length of the article 

 and varying in number from 12 to 21, the majority having 16. 

 Rostrum reaching slightly beyond the 3rd coxae. Prothoracic 

 lateral tubercles small but distinct. Cornicles black, short, 

 slightly constricted before the end, basal one-third imbricated, 

 the remainder reticulate, 0.27 mm. long. Cauda black, 0.35 

 mm. long. 



Host plant — Kiku, Chrysanthemitm, species. 

 Locality — Nishigahara, Tokyo. 

 Date of collection — May 9, 1913. 

 Collection number — 10. 



