THE CANADIAN ENTOMOLOGIST 



247 



The two species differ as follows: — 



V. dryophila 



4 or 5 sensoria on antennal III. 



About 9 long hairs on antennal III. 

 Mesothorax appearing as single chitin 

 plate. 



V. californica 



Only the apical sensorium on anten- 

 nal III. 



3 or 4 long hairs on antennal III. 



Mesothorax appearing as partially 

 divided into lobes. 



Dates of collection of winged forms are as follows: May 16, 1915; April 

 29, 1916; May 8, 1916; Quercus lohata Nee, Walnut Creek, Cal., May 14, 1917; 

 Quercus macrocarpa Michx., Sacramento, Cal. 

 Myzocallis quercifolii, sp. nov. 



Alate viviparous female. 



General colour light green; antennse pale green with narrow brown annu- 

 lations at apices of joints, filament of joint VI brownish; head and thoracic 

 lobes olive green; wings hyaline, stigma very pale with dusky brown spots at 

 base and apex; legs pale green, base of tibia with a brown ring, femora brownish 

 near apex, tarsi and tibial apices brown; tubercles of thorax and abdomen 

 paler than body colour; cornicles pale green; cauda and anal plate pale green; 

 beak pale, extreme tip brown; venter light green. 



Antennge on short frontal tubercles, slender, longer than body, base and 

 filament of joint VI subequal; joint III with one or two circular sensoria near 

 the base; antennal spines rather stout; the forehead bears 8 stout prominent 

 pale capitate spines, in length equal to half the width of the forehead. Pro- 

 thorax and mesothorax each with a pair of tubercles on the dorsum. Abdo- 

 men narrow, with three pairs of conical tubercles on the dorsum and with three 

 pairs of blunt tubercles on sides. Cornicles slightly longer than wide at base, 

 somewhat constricted in centre. Cauda globular, spinose. Anal plate deeply 

 cleft, spinose. Beak reaches to the second coxa. Wings longer than body. 



Measurements. — Length of body (mounted specimens) about 1.25 mm. 

 W^idth of body about .45 mm. Antennae, joint lengths: III .61 mm., IV .35 

 mm., V .32 mm., VI .28 mm. (.145 mm. plus .135 mm.). Length of wing 1.94 

 mm., of cornicles .085 mm., of cauda .08 mm., of beak .23 mm., of hind tibia 

 1.06 mm. 



Described from 3 individuals collected on the leaves of Blue Oak {Quercus 

 douglasii H. & A.) by Mr. F. B. Herbert, Los Gatos, Cal., June 4, 1917. 



This species is closely related to Myzocallis quercus Kaltenbach, M. pasanicB 

 Davidson, M. calif ornicus Baker, and M. calif amicus Baker var. pallidus, below 

 described. The prominent capitate spines on the forehead will distinguish it 

 from others. 



The following key will separate the above species: 



1. Cornicles partly black Myzocallis quercus Kalt. 



Cornicles pale throughout 2. 



2. Forehead of winged vivipara with prominent capitate 



spines Myzocallis quercifolii, sp. nov. 



Forehead of winged vivipara with spines non-capitate or indistinctly 

 capitate ' 3. 



