116 MISCELLANEOUS STUDIES 



Apterous viviparous female. These are very similar to the alate 

 females, only slightly larger. The antennae are dusky throughout 

 except the base of III. They reach to the base of the first abdominal 

 segment. Ill is the longest segment. VI spur is next, being about 

 two-thirds as long. IV, V, and VI base are subequal, with V some- 

 what shorter than the others. The usual primary and accessory sen- 

 soria are present on V and VI. Ill has two or three small secondary 

 sensoria located in the apical one-third of the segment. IV has from 

 one to three in the apical one-half. The prothorax and the first and 

 seventh abdominal segments each have a pair of conspicuous lateral 

 tubercles. The cornicles are black and somewhat larger than in the 

 alates, being slightly longer than the hind tarsi. The cauda is a 

 little shorter than the hind tarsi. 



Measurements: Body length, 1.632 to 1.785 mm. (av. 1.708 mm.) ; 

 width of thorax, 0.748 to 0.85 mm. (av. 0.799 mm.) ; antennae total, 

 0.867 to 0.969 mm. (av. 0.9265 mm.) ; III, 0.2465 to 0.289 mm. (av. 

 0.2635 mm.) ; IV, 0.102 to 0.136 mm. (av. 0.119 mm.) ; V, 0.102 to 

 0.119 mm. (av. 0.1105 mm.) ; VI, base 0.119 mm.; VI, spur 0.1615 to 

 0.187 mm. (av. 0.17 mm.) ; cornicles, 0.153 to 0.17 mm. (av. 0.1615 

 mm.) ; cauda 0.119 mm. ; hind tarsus, 0.136 mm. 



133. Aphis mori Clarke 



Clarke, Can. Ent., vol. 35, p. 251, 1903 (orig. desc.). 

 Record. Morus sp., Berkeley (Clarke). 



This is a rather doubtful species, described by Clarke from speci- 

 mens taken on mulberry in Berkeley. Since the original description 

 it has never again been observed. 



134. Aphis neomexicana Ckll. var. pacifica Dvdn. 



Figures 300, 302 



Davidson, Jour. Econ. Ent., vol. 10, p. 293, 1917 (orig. desc. var.). 

 Records. Eibes rubrum; Walnut Creek, Contra Costa County, and San Jose 

 (Davidson). 



Davidson described this variety from specimens found curling the 

 leaves of cultivated red currant in Walnut Creek in June, 1915. 

 What he takes to be the same species he had already collected in San 

 Jose in May, 1912. The author has specimens from him, but has never 

 collected any himself. 



