Pomona College Journal of Entomology 



783 



with the third discoidal, tip emerges at tlie wing margin above the middle of 

 the end of tlie wing; discoidals variabh', especially the third discoidal wliich 

 is very indistinct, sometimes simple, and once forked as shown in the drawings 

 of the primary wings (Figure 248, 9-16), these variations may be found on the 

 same insect as 9 and 10 are pairs; first discoidal well defined and dark, base 

 near the middle of the subcostal, straiglit or curves sligiitly inwardly; second 

 discoidal arises but a short distance from the bsuse of the first, curves inwardly, 

 may be undulate, well defined and dark, these two discoidals are fairly con- 

 stant; third discoidal faint or sub-obsolete, simple and undulate, once- 

 branched, obsolete at base; if simple it is undulate and nearly parallel with 



Figure 248. Essigella californicus (Essig) Del Guercio 

 antenna of the winged female; 2, antennae of the apterous female; 3, top view and 

 4, side view of the cornicle of the winged female; 5, tarsi of winged female; 6, 

 ventral aspect of the abdomen of the apterous female: 7 and 8, top and side view 

 of the cornicle of the apterous female; 9-16, wings showing differences in venation 

 — 9 and 10 are pairs from two specimens. 



the stigmal vein; if once branched the fork is usually within the basal half of 

 the length, though this is variable as 11 shows the fork to be beyond the 

 middle. In 14 and 15 the two branches of the fork are visible while the vein 

 and fork are obsolete. Secondary — Length 2.2 mm., width 0.5 mm., dusky or 

 sub-hyaline. Subcostal wide and well defined, dark, nearly straight with an 

 upward liend in the apical half, slightly undulate. Discoidals well defined, 

 dusky, obsolete at bases, both arise within the basal half of the subcostal. 

 First discoidal undulate, light at base and darkens towards apex; second dis- 

 coidal curves inwardly, becoming darker from base towards the tip. Both 

 discoidals may be nearly straight. Style — Obsolete. Pygidium — Well round- 

 ed, dusky, hairy. 



