ESSIG. APHIDIDAE OF SOUTHERN CALIFORNIA 3 



cular, IV one large circular, V one terminal surrounded by five marginal — all 

 in the apical process. Pro-thorax — lateral tubercles wanting. Rostrum — not 

 half as long as the body. Abdomen — very indistinctly segmented and covered 

 with numerous red dots. Cornicles — truncate, nearly obsolete. Legs — Hairy, 

 very long, due to the enormous lengths of the tibia, and especially the tibia of 

 the hind legs which are very long; they have no sensoria. The lengths of the 

 tibia of the respective legs are : pro-thoracic 0.51 mm., meso-thoracic 0.57 mm., 

 meta-thoracic 1.1mm. These long legs enable the aphid to move very rapidly. 

 The hind legs are especially adapted for clinging to the slender pine needles 

 along which it moves at a great rate. Wings — Entirely clear, primary — 

 length 2.4 mm., width 0.75 mm. Cubitus — well defined. Stigmal — nearly 

 straight, marking lower margin of a narrow distinct stigma. Radius — straight, 

 extending from stigmal vein to margin. Of the third oblique only two rem- 

 nants remain, showing that it was undoubtedly once forked. The first and 



Figure 3. Rhopalosiphum violae 



second obliques are straight. They arise together about the middle of the 

 cubitus and extend to the margin. Secondary — ^length 1.63 mm., width 0.32 

 mm. Two discoidals. Subcostal — well marked and extending to tip of the 

 wing. The first discoidal arises from the sub-costal near the base and extends 

 nearly to the margin of the wing. The second discoidal arises from the sub- 

 costal at a distance from the first discoidal equal to the distance from the first 

 discoidal to the base of the wing and extends nearly to the margin. Cauda — 

 rounded, slightly hairy. Style — obsolete. 



Apterous Viviparous Female. — (Figure 2.) Length 1.6 mm., width 

 0.5 mm. Differs from the winged form as follows : On the antennae 

 (Figure 5, I) the sensoria are distributed as follows: I and II none. III many 

 large circular, IV four large circular, V one terminal surrounded by several 

 marginal in the process. On the legs the sensoria are distributed as follows : 



