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



Macrosiphum nipponicum, new species 

 Figure 4 



Winged viviparous female (Type) — Selected from 5 in- 

 dividuals. Length 1.7 mm., width 0.09 mm. Prevailing color 

 bright shiny crimson-lake. Antennae dusky, with I and II 

 black, III-VI with black apices, few short hairs or knobbed 

 spines, imbricated; lengths of articles: I, 0.10 mm.; II, 0.07 

 mm. ; III, 0.62 mm. ; IV, 0.48 mm. ; V, 0.50 mm. ; VI, 0.97 mm. 

 (base 0.17 mm., filament 0.80 mm.) ; total 2.74 mm. Sensoria 

 circular. On III there are 8 (left) and 7 (right) in a row. 

 Paratypes show a variation of from 7 to 9 which are usually 

 confined to the basal two-thirds of the article. Rostrum reach- 

 ing about to the 2nd coxse. Coxae and trochanters pale-brown, 

 femora brown, with their apical halves black, tibiae amber with 

 both ends black, tarsi all black. Front wings 3.7 mm. long. 

 Abdomen bright crimson-lake with black markings on the 

 dorsum. Cornicles black, imbricated at the tips, 0.48 mm. 

 long (of a paratype 0.55 mm. long). Cauda dusky or black 

 (of a paratype) 0.23 mm. long. 



Apterous viviparous females (Paratypes) — Six indi- 

 viduals. Length 1.8 mm., width 1.2 mm. Prevailing color 

 bright crimson-lake. Head dusky. Antennae imbricated; 

 articles I, II, V and VI black; III and IV pale with black 

 apices ; lengths of articles : I, 0.15 mm. ; II, 0.09 mm. ; III, 0.65 

 mm.; IV, 0.49 mm.; V, 0.41 mm.; VI, 0.85 mm. (base 0.16 

 mm., filament 0.69 mm.) ; total 2.68 mm. From 1 to 3 large 

 circular sensoria near the base of III. Rostrum reaching 

 nearly to the 3rd coxae. Prothorax dusky, the rest of the thorax 

 bright shiny crimson-lake. Abdomen same color with black 

 markings on the dorsum. Cornicles black, imbricated at the 

 tips, 0.63 mm. long. Cauda dark, 0.24 mm. long. 



Host plant — Not given. 



Locality — Kurayamizaka, Nishigahara, Tokyo. 

 Date of collection — May, 1913. 

 Collection number — 24. 



