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Pomona College Journ.vl op Entomology 



stigma rather long and slender with sharplj' pointed tip, nearly three times 

 as wide as the length, rich brown in color, length 0.6 mm., width 0.16 mm. 

 Stigmal vein arising a little nearer the tip than the middle of the stigma, 

 strongly curved throughout the basal half, but slightly curved throughout the 

 apical half, rich brown. Discoidals brown, well defined, and normal ; first 

 discoidal arising just inside the middle of the subcostal, straight, reaches to 

 the wing margin; second di.scoidal arising just outside the middle of the sub- 

 costal, slightly curved with the convex surface towards the wing tip, not quite 

 reaching the wing margin; third discoidal obsolete at the base, twice-forked, 

 first fork just above the middle of the vein, second fork near the tip of the 

 wing, the upper branch being nearly twice as long as the lower branch. Sec- 

 ondary — Length 1.2 mm., width 0.36 mm., normally veined with subcostal and 

 two discoidals. Subcostal undulate, greatest downward bend at the base of 

 the second discoidal; first discoidal ob.solete at the base and not reaching to 

 the wing margin, curved with the slightly convex surface towards the wing 

 tip, arising inside the middle of the subcostal ; second discoidal arising l)eyond 

 the middle of the subcostal, which the base touches, straight, not quite touch- 

 ing the wing margin. Style — (Figure 252, 3 and 5). Rather long, ensiform 

 from a dorsal aspect and sickle-shaped from a lateral aspect, covered with 

 small rough scaly projections, with four rather long curved hairs arising near 

 the middle, dull olive green (may be slightly covered with whitish powder), 

 length 0.12 imn., or about half as long as the cornicles. 



jU»terous viviparous female (Figure 252, B) 



Length of the body 1.5 mm., width of the abdomen 0.8 mm. Body — 

 Oblong oval, to nearly globular in shape, small, shiny above and floeeulent 

 under thorax. Prevailing color — Light green, dull olive green, to almost black, 

 dorsuTii perfectly smooth, ventral surface of head, thorax and appendages 

 floeeulent, as in the winged forms. This flocculenee seems to be a striking 

 characteristic of this species and is evidently a protection against the water. 

 Head — Rather large for so small a body, with small, but distinct frontal 

 tubercles, much wider than long, somewhat lighter than most of the body, 

 being a dull amber brown dorsally with fine powder on ventral .surface. Eyes 

 —Large a.s in the winged form, red. Antennae— {Figure 252, 8, 9). Reaching 

 to the middle of the abdomen, a little over half the length of the body; on 

 short, but distinct frcntal tubercles, with very few hairs; imbricated except 

 articles I, II and the apical one-fourth of the spur of VI ; dull blackish-green 

 throughout Avith short, fiocculent clinging to the under surface of the articles. 

 Lengths of the articles: I, 0.055 mm.; II, 0.055 mm.; Ill, 0.186 mm.; IV, 

 0.134 mm.; V, 0.12 mm.; VI, 0.38 mm., (base 0.08 mm., spur 0.3 mm.) ; total 

 0.93 mm. The comparative lengths compare very well with those of the winged 

 individuals, only III is not so long, and IV is but slightly longer than V. 

 Sen.soria normal on V and in the process of VI. Rostrum — Reaching beyond 

 the tiiird coxa^ and nearly to tlie middle of the abdomen, light yellow with 

 extreme base and apical one-half diirk. Thorax — Dull olive green with 



