534 Pomona College Journal of Entomology 



moult and tarly begin to show tlie liglit longitudinal dorsal band, which is very 

 characteristic of this species. 



Host — Tiiis species occurs in small comjiact colonics on the dorsal sides of the 

 leaves, or in large colonies on the tender shoots of the Narrow-leaved Willow 

 (Salix laevigata Bebb.) Also taken in considerable numbers on Cottonwood 

 (Populus frichocarpa). 



Locality — Along the inland streams near Santa Paula, Cal. A very common 

 species. Date of collection — March 31, 1911. Serial number 18. 



Hyadaphis pastinacae (Linn.) Schout. 

 SYNONOMY 

 1767 Aphis pastinacae Linn. Syst. Nat. I, 734. 

 1767 Aphis aegopodii Scopoli, Cam. 399- 

 •1794 Aphis caprae Fabr., Ent. Syst, IV, 213. 

 1854 Rhopalosiphum cicutae Koch, Pflz., p. 24. 

 1854 Rhopalosiphum pas/inacae Koch, Pflz., p. 41. 

 1854 Aphis umbellatarum Koch, Pflz., p. 116. 

 I860 Siphocoryne pastinacae Pass., Gali Afid. 



1879 Rhopalosiphum salicis Monell, Bull. U. S. Geol. Surv. V. 26. 

 I860 Siphocoryne pastinacae Pass., Gali. Afid. 

 1905 Hyadaphis pastinacae (Linn.) Schout., Aphides Belgique, p. 229. 



WINGED VIVIPAROUS FEMALE (Figure 174) 

 Length of body 2.3 mm., width of mesothorax 0.8 mm., greatest width of 

 abdomen 0.8 mm., wing expansion 7-0 mm. 



Prevailing color — Green with dark brown, dark green or black markings. 

 Head — Small, nearly as long as wide, narrower than prothorax, slight projections 

 on the inner sides of the bases of the antenna instead of frontal tubercles. Eyes — 

 Dark red. Antennae — (Figure 174 D). Reaching to third abdominal segment (a 

 little longer than half of the body length), dark throughout, sparsely haired, 

 lengths of articles: I, 0.06 mm.; II, 0.05 mm.; Ill, 0.58 mm.; IV, 0.19 mm.; V, 

 0.13 mm.; VI, 0.48 mm. (spur 0.38 mm.), total 1.49 mm.; circular sensoria on III 

 very numerous and on short tubercles. Rostrum — Reaching to, or nearly to, second 

 coxa?, light yellow with extreme base and the tip dark. Prothoraj: — Long, widest 

 at base, light green band around anterior end, narrow central marginal light green 

 area at base, remainder dark or dusky. Mesothorax — Very dark or black, posterior 

 end of muscular lobes highest and pointed, ventral surface, except coxte, dark. 

 Metathorax — Dark dorsallj' and green ventrally. Abdomen — Distinctly seg- 

 mented, rich green color with dorsal black or very dark green markings as shown 

 in cut. Small characteristic tubercle or horn located on the middle dorsum of the 

 penultimate segment, ventral surface dull green, anal plate (Figure 174 A, B, C). 

 Area just above style appears glandular and dusky. Cornicles — Figure 174 G, H). 

 Clavate, reaching nearly to tip of abdomen, liglit green with apical two-thirds (tlie 

 swollen area) dusky, trumpet-mouthed, length 0.42 mm. Legs — (Figure 174 E, F). 

 Rather long and slender, normal, hairy, coxa of first and second pairs green; 



