8 POMONA JOURNAL OF ENTOMOLOGY 



thorax. Compound eyes — large and dark, with long terete (ocellar?) tuber- 

 cles just behind near the posterior border. Antennae (Figiire 5, L) arise 

 from large frontal tubercles, are six-jointed, 1.83 mm. long, transversely 

 scabrous, with a basal nail-like process on the sixth article. The lengths of 

 the respective articles are as follows: I 0.07 mm., II 0.09 mm., Ill 0.4 mm., 



IV 0.22 mm., V 0.3 mm., VI 0.75 mm. The sensoria are distributed as follows : 

 I and II none. III row of six large circular, IV one large circular near middle, 



V one large circular near distal end, VI one large terminal surrounded by 

 several small marginal in the process. Pro-thorax — with distinct lateral tuber- 

 cles. Rostrum — half as long as body. Abdomen covered with numerous short 

 tubercles. Cornicles — cylindrical, 0.25 mm. long, and transverself scabrous. 



Wings — Clear. Primary — length 2.24 mm., width 0.83 mm. Cubitus — 

 well defined. Stigma — long and slender. Radius — sharply curved. The third 

 oblique is twice forked. ( In this form the second fork of the third oblique is 

 nuich nearer the margin than in the wine-red form.) The first and second 

 obliques are straight and extend to the margin. Secondary — length 1.12 mm., 

 width 0.37 mm. They have well defined subcostal -extending to the tip of the 

 wing and two discoidals. The first discoidal joins the sub-costal at a distance 

 of one-third and the second discoidal joins it at two-thirds distance from base 

 lo wing-tip. Style — prominent, conical, hairy. 



Apterous Viviparous Fe;m.\le;. — Length 1.67 mm., width 0.78 mm. 

 Differs from winged form as follows : The distribution of the sensoria 

 (Figure 5, M) is as follows: I, II, III and IV none, V one large circular near 

 the distal end, VI one large terminal in the nail-like process. Sense-hair — 

 few. Cornicles ..21 mm. long. (Figure 4, E.) 



It will be noted that the pro-thoracic tubercles of this green form ally it 

 apparently to the genus Macrosiphum. It is, however, for the present left with 

 Rhopalosiphwm violae. 



Pemphigus radicicola, n. sp. 



Winged Viviparous Female. — Length 1.9 mm., width 0.8 mm., 

 wing expanse 4.6 mm. Prevailing color — dark brown. Thorax and antennae 

 — somewhat darker. Legs — lighter. Shape — nearly cylindrical. (Figure 6.) 



Head — Short, broader than long. Vertex bisected by a distinct suture. 

 Narrower than thorax. Compound eyes — large, with prominent terete (ocel- 

 lar?) tubercles just behind near the posterior border. Antennae (Figure 5. H) 

 do not arise from frontal tubercles; five-jointed; 0.85 mm. long; with an apical 

 nail-like process on last article. The lengths of the respective articles are as 

 follows: I 0.06 mm., 11 0.12 mm., Ill 0.38 mm., IV 0.12 mm.. V 0.17 mm. 

 The distribution of the sensoria is as follows: I and II none. III many 

 large and small circular ones, IV one large terminal and one large marginal 

 near the proximal end, V one large cup-shaped terminal surrounded by several 

 irregular marginals in the process. Pro-thorax — without lateral tubercles. 

 Rostrum — half as long as body. Abdomen — very distinctly segmented along 

 M'des. Breathing spiracles along sides are very prominent, and raised on 



