ALBERT F. SWAIN 7 



Apterae: antenna! segments differ in coloration as follows: 



S. albisiphus Davis S. chrysolepis new species 



IV, pale wath tip dusky pale wath apical one-fourth dusky 



V, pale with tip dusky pale with apical one-half dusky 



VI, pale with apical one-half dusky duskj' throughout 



Neither Essig nor Davidson were able^o identify this species 

 with any known to them, and it is herewith described as a new 

 species, being named after its onl}^ known host plant, Quercus 

 chrysolepis. Cotj'pe specimens are in the writer's collection 

 under the serial nmnber AFS 6-16 and in the collection of the 

 Universit}- of California. 



Alate viviparous female. — Prevailing color dark brown. Head dark brown 

 eyes red. Antennal segments I and II concolorous with the head, in pale 

 with tip dusky, IV and V pale with apical one-third dusky, VI dusky through- 

 out. Beak brown with apex darker. Prothorax and thorax dark brown with 

 thoracic lobes very dark brown or black. Femora and tarsi of all the legs and 

 tibiae of the hind legs dusky. Tibiae of the first two pair of legs pale with 

 their apices dusky. Abdomen dark bro\\ai tlii'oughout. Cornicles pale, being 

 whitish and very conspicuous in life. (This is the character which caused the 

 WTiter to believe this species to be S. albisiphus Davis.) Cauda and anal plate 

 pale at the base and duskj' at distal edge. Wings normal. 



Head about twice as broad as long -^dth the front flat and with no antennal 

 tubercles. Antennae (fig. 14) shorter than body, reaching onlj'- to the fifth 

 abdominal segment. Segment III the longest segment, IV and V subequal 

 and about three-foui-ths as long as III. Base of VI slightly longer than spur, 

 the two together being but slightly more than one-half the length of III. 

 The usual primary sensoria are present on V and VI, together with the usual 

 accessor}^ sensoria on VI. On IV there are one or two fairlj^ large, circular, 

 secondary' sensoria, although in a few specimens there are no sensoria; one is 

 located midway betwee>n the base and the apex of the segment (fig. 14), the 

 second, when present, midway between the first and the apex of the segment 

 (fig. 16). There are from six to ten fairh' large, circular, secondary sensoria on 

 III (figs. 14 and 16), extending from near the base almost to the apex. The 

 beak does not quite extend to the second coxae. The prothorax and abdo- 

 men are without lateral tubercles. The cornicles (fig. 30) are short, being 

 but slightly longer than broad at the base, and less than half as long as the 

 hind tarsi, and are constricted in the middle. The cauda (fig. 32) is half- 

 moon shaped, somewhat shorter than the cornicles. The anal plate (fig. 38) 

 is distinct and conspicuoush' bilobed. 



Measurements: Body length, 1.41-1. .56 mm. (ave. 1.49 mm.): width of 

 thorax .714-. 765 mm. (ave. .733 mm.): antennae total, 1.38-1.52 mm. (ave. 

 1.428 mm.); Ill, .391-.434 mm. (ave. .416 mm.); IV, .264-.323 mm. (ave. .304 

 mm.); V, .272-323 mm. (ave. .302 mm.); VI base, .12S-.170 mm. (ave. .146 

 mm.); VI spur, .085-128 mm. (ave. 101 mm.): cornicles, .051-. 077 mm. (ave. 



TRANS. .■VM. EXT. SOC, XLIV. 



