12 MISCELLANEOUS STUDIES 



2. Antennae with short terminal joint (fig. 3), (except in Pterocommini, but then 

 the cauda is not tail-like). Body ridges with more than six longitudinal 

 rows of hairs. Hairy covering mostly thick. Cauda not lengthened tail-like, 

 anal plate widely rounded (fig. 5). Wax glands either present or lacking. 

 Mostly strongly monophagous forms, at times of remarkable size. Found 



mostly on tree growths and without change of hosts Group Lachnina 



Terminal joint of antennae always with a long, slender filamentous projection 

 (fig. 4). Body ridges of young larvae at most with only six longitudinal 

 rows of hairs, which may be increased after the first molt. Cauda either 

 short or lengthened tail-like, anal plate widely rounded (fig. 6). Species 

 monophagous or polyphagous, many with a change of host plants. On 

 tree or herbaceous growths Group Aphldina 



Group Callipterina Mord 

 (Subfamily Callipterinae Borner) 



Mordwilko, Ann. Imperial Acad. Sci., St. Petersb., 1908. 



Borner, in Sorauer, Handbuch der Pflanzenkrankheiten, vol. 3, p. 664, 1913. 



According to Borner this group consists of two tribes, -the Phyl- 

 laphidini and the Callipterini. He divides the Callipterini into two 

 groups, the Callipterini and the Chaitophori. The author has followed 

 him to a certain extent, but has given each of the last two groups equal 

 rank with the Phyllaphidini, and thus considers this group, Callip- 

 terina, as consisting of three tribes. Below is a key to the same : 



1. Wax glands with faceted pore fields present. Antennae as in Lachnina 



(fig. 13). Pubescence delicate Tribe Phyllaphidini 



Wax glands lacking or without faceted pore fields. Pubescence often very 

 remarkable. Terminal joint of the antennae often lengthened into a bristle 

 (fig. 30) 2 



2. Anal plate more or less emarginate or bilobed (fig. 7), except in Euceraphis 



Koch Tribe Callipterini 



- Anal plate widely, truncate or rounded (fig. 8) Tribe Chaitophorini 



Tribe Phillaphidini Borner 



Borner, in Sorauer, Handbuch der Pflanzenkrankheiten, vol. 3, p. 664, 1913. 



This tribe Phyllaphidini consists of but one genus, Phyllaphis 

 Koch, which is represented in California by three species. 



L Genus Phyllaphis Koch 

 Koch, Die Pflanzenlause, p. 248, 1857. Type Aphis fagl Linn. 



KEY TO CALIFORNIA SPECIES 



1. Alate viviparous females unknown. Wing venation of alate males similar to 

 that of Eriosoma spp. (fig. 17). Forming pseudogalls on edges of leaves 

 or living free in masses of white flocculence on leaves of Quercus spp. 



quercicola Baker 



