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



Front wings 2.7 mm. long. Abdomen pale-green with indis- 

 tinct rough wart-like marginal tubercles. Cornicles dusky, 

 straight, widest at the base, slightly flaring at the mouth, im- 

 bricated with several spine-like hairs and 0.18 mm. long. 

 Cauda pale green, short, bluntly pointed, 0.07 mm. long. 



Apterous viviparous females (Paratypes) — A good ser- 

 ies of specimens. Length 1.5 mm., wndth 1.1 mm. Prevailing 

 colors pale and dark green. Antennae dark with the base of 

 III pale, imbricated ; lengths of articles : I, 0.05 mm. ; II, 0.06 

 mm.; Ill, 0.19 mm.; IV, 0.14 mm.; V, 0.12 mm.; VI, 0.32 

 mm. (base 0.09 mm., filament 0.23 mm.) ; total 0.88 mm. Pro- 

 thoracic tubercles in the form of large rough basal projections. 

 Abdomen pale-green, with short, wart-like marginal tubercles. 

 Cornicles black, imbricated, same shape as in the winged form, 

 and with several spines as shown in the accompanying draw- 

 ing; length 0.25 mm. Cauda dark, wildest at base, pointed, 

 0.13 mm. long. 



Nymphs — pale-green with dusky antennae and cornicles. 



Host plant — Cherry. 



Locality — Nishigahara, Tokyo. 



Date of collection — May 10, 1913. 



Collection number — 16. 



Remarks — Named from the spines of the cornicles. 



Aphis thalictrii, new species 

 Figure 21 



Winged viviparous female (Type) — Selected from two 

 good specimens. Length 1.2 mm. Only side view shown so 

 no measurement of width possible. Prevailing colors yellow 

 and black. Head black. Antennae black throughout, inibri- 

 cated, with article III exceptionally long; lengths of articles: 

 I, 0.06 mm. ; II, 0.05 mm. ; III, 0.58 mm. ; IV, 0.13 mm. ; V, 

 0.13 mm. ; VI, 0.25 mm. (base 0.10 mm., filament 0.15 mm.) ; 

 total 1.2 mm. Article III with many sensoria ; 56 on left mem- 

 ber and 64 on right ; the paratype shows 44 and 52 ; remaining 

 articles with the usual number. Rostrum reaching nearly to 

 the 2nd coxae. Prothorax dusky yellow, remaining thoracic 



