December, '11] DAVIDSON: new CALIFORNIA APHIDS 



559 



a length about three times its diameter, the third as long as the second, the fourth 

 about one half longer than the third. Abdominal segments sparsely margined 

 posteriorly with whitish hairs. Ovipositor short, the lobes slender, with a length 

 thrice the width. Otherwise nearly as in the male. 



Reared from a woolly, oval gall on the lateral veins of shadbush, 

 Amelanchier, taken by Miss Cora H. Clarke at Magnolia, Mass. Type 

 C. al859. 



TWO NEW APHIDS FROM CALIFORNIA • 



By W. M Davidson, U. S. Bureau of Entomology, San Jose, Cat. 



So far as I can determine no plant louse has been reported from the 

 California laurel (Umhellularia calif ornica Nutt.) and so I will proceed 

 to describe an aphid taken by me on this tree at San Jose, California, 

 on July 1, 1911. 



Hyadaphis umbellularice sp. nov. 



Alate viviparous female. — ^Head, thorax, and abdomen green with a powdery white 

 covering. Eyes crimson. Thoracic lobes and scutellum dark purplish-black; 

 Head on the dorsum dark purple. Antennae little over half the length of the body, 

 joint III and the filament of about equal length. Comparative lengths of the joints 

 as follows: I .09 mm., II .06 mm.. Ill .39 mm., IV .2H mm., V .23 mm., VI .10 mm., 

 filament .38 mm. Legs green and powdery like the body; femoral apices, tibial 

 apices, and tarsi purplish-black. Tibiae with two rows of spines, one on either side. 

 Abdomen pale green with transverse white powdery bars. Cauda dusky, 0.14 mm. 

 m length, narrow, tapering. Cornicles green, smaller than the cauda, in length 

 0.08 mm., broad at the base, then narrowing to two-thirds their maximum width at 

 basal fourth, and thence widening distally so that their width at the apex equals 

 twice that at the base. Wings large; veins pale brown, second fork of third discoidal 

 a little nearer wing apex than first fork; stigma fairly long and narrow, green, as are 

 also the insertions and sub-costal vein. The sensoria on the antennae are disposed 

 as follows: joint III has 25-30; joint IV 5-9; joint V 1 near the apex; joint VI, 1 

 terminal. Those on joint III are placed irregularly and arc small, those on joint 

 IV are in a single row and their size is similar to those in joint III. Beak short, 

 reaching second coxae, green with the extreme tip black. Mesosternum black. 



Measurements of the body. — Length of body, 1.80 mm.; breadth of body, 0.05 mm.; 

 wing expanse, 5.75 mm. 



Taken on the underside of the leaves of California Laurel (Umbel- 

 lularia calif ornica ^uii.) July 1, 1911. Habitat: SanJos^, California. 



Cryptosiphum tahoense sp. nov. 



Winged oviparous female.— Dark olive green, newly hatched specimens paler- 

 Head, thoracic lobes and scutellum dark brown. Eyes dark red. Antennae olive 

 green, hardly one third as long as the body, on frontal tubercles. Ocelli distinct. 

 Prothorax and abdomen olive green. Lateral tubercles absent. Abdomen with 



I Published by permission of the Chief of the Bureau of Entomology. 



