792 Pomona College Jocirn.vl op Entomology 



The sensoria are circular and irregularly distributed on articles III, IV, V, 

 and VI as follows: III, from fourteen to twenty; IV, from four to eight; V, 

 from two to four; VI, usually a single large one. Rostrum — Reaching to the 

 second coxeb, very light or dusky yellow with dark base and tip. Prothorax — 

 Narrow, wider at ba.se, as long or longer than the head, with distinct lateral 

 tubercles just in front of the middle, very dark with lighter green transverse 

 bands extending across the apical and posterior ends. Mesothorax — Much 

 wider than the prothorax, muscle lobes well developed, lobes black, shiny, 

 while the remainder of the segment is dark green. Metathorax — Not as wide 

 as the mesothoras, dark green with muscle lobes black. Abdomen — Evenly 

 rounded so that the posterior end is nearly as blunt as the base, with the 

 exception of the protruding style and anal plate, smooth and shiny, evenly 

 colored nearly black or very dark green — specimens do not show the marginal 

 black spots referred to by eastern writers, probably because the dark color 

 hides them. One minute posterior and one anterior lateral tubercle. Anal 

 plate black. C or nkles— (Figure 251, 5). Cylindrical, constricted just before 

 the mouth, which is ilaring, not reaching to the tip of the abdomen, imbri- 

 cated, very dark or black, length 0.27 mm., average width 0.045 mm. Legs — 

 Normal, covered with few fine hairs; coxa; black; femora amber yellow with 

 apical two-thirds dark brown; tibia? amber yellow witli dark tip and base; 

 tarsi dark. Wings — Hyaline, normal "Aphis" venation. I'rimary — Length 

 3.1 mm., width 1.15 mm. Venation variable and not at all constant. Costal 

 vein wide, amber. Subcostal much wider than the costal, yellow to the base 

 of the stigma. Stigma — Long and narrow, nearly half as long as the sub- 

 costal vein, sharp, pointed at the tip, rich dark brown, length 1.05 mm., width 

 0.14 mm. Stigmal vein arises from near the middle of the stigma, strongly 

 bent throughout first half and remainder nearly straight or undulate to tip 

 of wing, rather long. First discoidal arising just inside the middle of the 

 subcostal, nearly straight, rich brown ; second discoidal arising just beyond 

 middle of the subcostal, base often sub-obsolete, curving with the convex 

 surface towards the wing tip, nearly twice as long as the fir.st discoidal; third 

 discoidal normally twice branched, with first fork near the middle of the 

 vein and the second near the wing tip. In the specimens collected in this 

 locality (fifty mounted specimens examined) more than half had the third 

 discoidal only once-branched with the fork corresponding to the first fork 

 of the normal wing, all branches a rich amber, base obsolete. Secondary — 

 Length 1.8 mm., width 0.58 mm. Subcostal vein with deep downward bend 

 under booklets and beyond the base of the second discoidal. Discoidals 

 straight, obsolete at their bases, nearly parallel. Veins brown. Style — 

 Slender, nearly cylindrical, aboiit half as long as tlie cornicles, dull green, 

 hairy. 



APTERors vrviPARoiis FEMALE (Figure 251, B) 



Length 2.3 mnu, width of abdomen 1.1 mm. Body — Dull black, evenly 

 rounded, showing little segmentation, smooth. Prevailing color — Dull green- 

 ish-black, bluish-blark, or vclvcty-black, with no distinct l)ii(lv markings. Uiad 



