Pomona College, Claremont, California 25 
incisions shallow except at the caudal margin where they become 
deeper and the wax tubes longer and narrower. The thoracic 
tracheal folds are not evident. 
Adult female:—Length 1.2 mm.; general color light yellow 
with head and thorax darker than abdomen. Legs and mentum 
dusky. Paronychium blade-like; wings immaculate. Forewing 
length 1.2 mm., width 0.40 mm. Radial sector, media and cubitus 
present: radial sector with two flexures. Media short; cubitus a 
faint line except at the base. Antennae dusky; average lengths 
of segments as follows: segment 1, 0.024 mm., segment 2, 0.158 
mm., segment 3, 0.109 mm., segment 4, 0.062 mm., segment 5, 0.072, 
segment 6, 0.044 mm., segment 7, 0.056 mm. Eyes very dark red, 
constricted but not divided. 
This species was collected by Professor E. O. Essig, for whom 
the species is named, on U/mus sp. at Mission San Jose, September 
1916. 
Aleyrodes pruinosa Bemis 
1904—Proc. U. S. Nat. Mus., vol. 27; p. 491. 
Food Plant.—Heteromeles arbutifolia. 
Localities—Berkeley, Catalina Islands, Leland Stanford Jr. 
University. 
Aleyrodes spiraeoides Quaintance 
1900—A. L. Quaintance. Tech. Ser. No. 8, Div. Entom. U. S. 
D. A., pp. 36-38. Orig. desc. 
Food Plants.—Aesculus californica, Convolvulus sepium, Loni- 
cera involucrata, Nicotiana glauca, Opulaster capitatus, Plantago 
major, Sonchus oleraceus, Sclanum douglasii, Troximon sp. Col- 
lected by the writer on Asclepias sp., at Berkeley, October 1916 
and in Santa Cruz County, November 1920; Ceanothus sp., Los 
Gatos, December 1917; Hypericum androsamum on the University 
of California Campus, November 1916: Melaleuca hypericifolia on 
the University of California Campus, November 1916 and on Pen- 
tastamen at Capitola, December 1917. 
Localities —Alameda, Berkeley, Los Angeles, Los Gatos, Santa 
Cruz County. 
Aleurotulus nephrolepidis (Quaintance) 
Syn.: extraniens Bemis 
1900—A. L. Quaintance. Tech. Ser. No. 8, Div. Entom. U. S. 
D. A., pp. 29-30. Orig. desc. 
Food Plants.—Acrostichum capense, nephrolepis. 
Localities.—Conservatories of San Francisco. Type locality, 
Pennsylvania. 
