387. 



potatoes. Other Aphids occurring in England on potatoes are :— 

 Rhopalosiphum dianlhi, Schr., R. tuberosellae, Theo., and Aphis 

 solanina. Pass. Aphis silybi. Pass., has been reported once from 

 Cornwall. 



Aphids taken on Douglas fir in Surrey are probably referable to 

 Chermes cooleyi var. coivani, Gill., but were too much damaged for 

 definite identification. 



Swain (A. F.). New Aphididae from California.— Trans. Amer. 

 Entom. Soc, Philadelphia, xliv, no. 1, March 1918, pp. 1-23, 

 2 plates. [Keceived 4th June 1919.] 



The following new species are described from California : Myzo- 

 callis davidsoni, previously considered to be Calaphis castaneae, Fitch, 

 but now proved to be distinct from this species, was found on Quercus 

 pedimculata and various species of chestnut. The alate stem-mothers 

 appear in the late spring and give rise, parthenogenetically, to alate 

 and apterous oviparous females throughout the summer. The sexual 

 forms appear in October and November, the males being alate and the 

 oviparous females apterous. The eggs are laid in October and 

 November on the bases of the buds, roughened parts of the bark of 

 branches and on the trunks of the trees. 



Myzocallis maureri was taken from the under-side of leaves of the 

 coast live oak {Quercus agrifolia) in June and July ; it has also been 

 found in March and April. Only oviparous females and nymphs have 

 so far been taken. In certain districts this species is only found on 

 black oak {Quercus helloggi), although Quercus agrifolia may be growing 

 side by side with it. 



Symydobius chrysolepis was found in April encircHng a terminal 

 twig and leaf-petiole of maul oak {Quercus chrysolepis), on which only 

 apterous oviparous females were noticed, though several alate indi- 

 viduals appeared later in the colonies removed to the laboratory. 

 This species has only been placed in this genus provisionally owing 

 to its resemblance to S. albisiphus, Davis, the main points of difference 

 being given in a table. A considerable number of Chalcid parasites, 

 Closterocerus utahensis, Craw., var. calif ornicus, Gir., emerged from 

 the apterous individuals. 



Alate and apterous oiviparous females of Nectarosiphoii morrison 

 were taken from twigs of Monterey cjrpress {Cupressus macrocarp)a) 

 in May ; in August apterous forms were also found on blue cypress 

 (C. guadalupensis). 



Lachmis ferrisi, previously recorded as L. abietis, Fitch, was found 

 infesting trunks of young pine trees {Pimis sp.) in September. 



L. taxifolia is a bark feeder and is found on the older growths of 

 the small limbs and on trunks of young trees in the spring, early 

 summer and also in August, its food-plant being Douglas fir {Pseudo- 

 tsuga taxifolia). A table is given showing the characters distinguishing 

 this species and L. pseudotsugae, Wilson. 



Aphis ramona, found in April and August attacldng black sage 

 {Ramona stachyoides), is more or less heavily parasitised and is attended 

 by ants to a considerable extent. 



Aphis senecio attacks a great variety of food-plants, a list of which is 

 given, the majority being composites. In the winter in Southern 



