ALBERT F. SWAIX 3 



in Berkeley from Castanea on July 31, 1915 (collection number 

 AFS 61-15), and from Quercus pedunculata on September 26, 

 1915 (collection number .4/^*5 74-15), and bj^ Essig from Castanea 

 in Berkeley on October 10, 1914 (collection number EOE 70). 

 Cotype specimens are in the private collection of E. 0. Essig, the 

 private collection of the writer, and the collection of the Univer- 

 sity of California under the numbers listed above. 



Alate viviparous female. — Prevailing color is lemon yellow. The head and 

 prothorax have a black median longitudinal stripe and a similar one on each 

 margin. The thoracic lobes are light brown, with the median part of each 

 lobe slightly darker. The abdomen is lemon yellow with four rows of black 

 spots, one row on each margin and two dorsal rows. These dorsal spots vary 

 considerably in size, those on the fom^th, fifth, and sixth segments being the 

 largest, oftentimes being confluent, thus forming black transverse bands across 

 these segments. The cornicles are dusky, the cauda and anal plate pale with 

 the posterior margins darker. The legs are pale with the apical half dusky, 

 and the tarsi and tips of the tibiae black. The antennae are grayish with the 

 spm- and tips of III-VI dusky. 



The head (fig. 1) is almost triangular, being over twice as wide as long and 

 coming to a distinct point at the apex between the cornicles. The antennal 

 tubercles are lacking, or very small and indistinct. The antennae are about 

 as long as the body, III being the longest segment, followed by IV, V, VI spiu", 

 VI base, I and II. The spur of VI is slightly more than half as long again as 

 the base, together being longer than V, but shorter than IV. The usual pri- 

 mary and accessory sensoria are present on VI and the primary sensorium on 

 V. On III there are from five to eight circular secondary sensoria, located in 

 the basal two-thirds of the segment (fig. 15). The body is without lateral 

 tubercles and without dorsal tubercles on the abdomen. The cornicles are 

 almost cj'lindi'ical, being slightly broader at the base than at the apex (fig. 

 34). The cauda is knobbed (fig. 35) and set on a broad base; the anal plate 

 is bilobed (fig. 36). The wing venation is normal. The costal vein is brown, 

 the subcostal and stigma gray. The discoidals are brown and quite distinct, 

 the first being slightly heavier than the others. The tips of the veins and the 

 apex of the stigma are shaded with grayish-brown. 



Measurements: Bodylength, 1.09-1. 46 mm. (ave. 1.28mm.): widthof thorax. 

 .468-. 620 mm. (ave. .59 mm.): antennae total, 1.0965-1.751 mm. (ave. 1.4404 

 mm.); Ill, .357-.646 mm. (ave. .04977 mm.); IV, .238-.408 mm. (ave. .3231 

 mm.); V, .17-.281 mm. (ave. .2321 mm.); VI base, .068-. 119 mm. (ave. .1038 

 mm.); VI spur, .1275-. 0204 mm. (ave. .1816 mm.): cornicles, .08-. 11 mm. (ave. 

 .0974 mm.): cauda, .08-. 09 mm. (ave. .086 mm.): hind tarsus, .12 mm.: wing 

 length, 2.65 mm.; wing width, 1.01 mm.; wing expansion, 5.9 mm. 



A very few of the alate females are without dorsal markings on the abdo- 

 men, but probably they are newly emerged adults, in which the colors have 

 not as yet set. 



TRANS. .\il. ENT. SOC, XLIV. 



