August, '15] 



DAVIDSON: ASTERN PLANT-LICE 



423 



lescing. Basal third of tibiae with bro"^Ti or blackish margins. Abdomen narrow 

 without markings. Cornicles a httle longer than wide, sHghtly constricted in the 

 centre, the apex flaring and shghtly obhque to the somewhat enlarged base. Cauda 

 globular, longer than the cornicles, constricted in the centre. Cornicles and Cauda 

 concolorous with the abdomen. Anal plate indistinctlj^ emarginate. Cauda and 

 anal plate thickly beset with spines. Beak pale gi-een, tip black, reaching almost to 

 the second pair of coxae. Short hairs occm' on antennae, head and legs. On the sides 

 of some of my specimens on the thi-ee basal abdominal segments occurs a pair of 

 indistinct pale blunt tubercles sm-mounted by a spine. The stem-mothers are 

 ■v\dnged and their appendages are relatively shorter than those of later generations. 



Pupa. — Similar in color to the winged female. Tarsi and articulations of antenna! 

 joints black. Long capitate spines occm- all over the body in rows. Three mature 

 specimens measure respectively 2.96 x 1.22 mm., 3.20 x 1.34 mm., 3.14 x .96 mm. 



A narrow elongate species occurring in California on the under side 

 of the leaves of Almis rhombifolia Nutt., and in Colorado on Betula 

 fontinalis and Almis sp. For the Colorado specimens I am indebted 

 to Prof. C. P. Gillette who figured the antenna of this species in JouK- 

 NAL OF Economic Entomology, iVugust 1910, p. 370, under the name 

 of Eucer aphis sp. 



Eucallipterus flavus Davidson 

 Euceraphis flava Davidson; Journal Econ. Ent., Vol. V, No. 5, Oct. 12. 



Oviparous female. — General color pale yellowish white. The individuals are some- 

 times slightly woolly but more often bare. There is a patch of silvery flocculence on 

 either side below the cornicles. The thorax and abdomen bear four longitudinal 

 rows of dusky subquadrate areas and of these the two central ones on abdominal 

 segments 4-8 inclusive are generally coalesced so as to form 5 rectangular areas. 

 Antennae on small frontal tubercles, longer than the body, pale with the articulations 

 blackish. Joint VI is shghtly longer than its filament. Cornicles black, much 

 ^adened basally, .12 mm. long and constricted in the centre. Cauda pale yeUow, 

 globular, heavily beset with spines. Legs pale, the tarsi dusky. Hind tibia very 

 sHghtly enlarged, sensoriated. Anal plate not bifm-cid, beset with spines. Beak pale 

 with the tip dusky, reaching a httle beyond the second coxal pair. There are 6 rows 

 of indistinctly capitate spines dowTi the thorax and abdomen. The eighth abdominal 

 segment bears on its posterior margin 18 spines. 



Collected in October 1913 and 1914 near Walnut Creek, Cal., on 

 leaves of Alnus rhombifolia Nutt. 



The oviparous female is very elongate and appears to be quite 

 prolific as I have an example in the abdomen of which are 15 eggs of 

 mature size. The eggs are laid in small groups at the axils of the new 

 buds on the twigs or canes. They are sparsely clothed with silvery 

 flocculence in the same manner as pertains in the Mealy Plum-louse 

 (Hyalopterus arundinis Fab.). 



Male. — General color pale whitish-yellow. This form like the winged viviparous 

 female is coated with a gray or bluish-gray flocculence. Antennal annulations dusky. 

 Antennae on large frontal tubercles, much longer than the body, the relative length 

 of the joints as in the oviparous female. Third joint with a large number of oval 



