39 



hairy, third joint the longest, the following subequal ; sensoria rather indistinct, 

 three or four to the third joint, and usually one or two to each of the following. 

 Beak reaching abdomen. Honey tubes as circular openings on level of surface of 

 abdomen, but rather conspicuous from being bordered with a ring of black. Wings 

 hyaline with slender but distinct veins. Fore wings with the cubital obsolete for 

 some distance at base ; stigma short and broad ; stigmal vein but slightly curved near 

 the base, straight. Expanse of wings, about 5 mm . 



Careful descriptions of the different forms on Cornus are given by Mr. 

 Clarence M. Weed (Psyche, V, p. 129), the species being referred doubt- 

 fully to cornicola Walsh. 



Winged viviparous female (pseudogyna pupifera). — Expanse of wings, 6 mm ; length 

 of body, 2 mm ; width of body, .80 nim ; length of antennas, .90 nim . 



Black above, except anterior and lateral margins of abdomen, and in many speci- 

 mens more or less of posterior portion. Beneath black, except prothorax and abdo- 

 men (save a black patch in front of anus), which are dull whitish -brown. Rostrum 

 black, except a more or less distinct lighter patch near base, hairy, reaching posterior 

 coxas. Legs robust, black, except a short brownish space at base of anterior femora ; 

 thickly provided with brown hairs. Antennae robust, beset with brown hairs. Joints 

 I and II, short, smooth; III, long, with row of tubercles on its outer veutro-lateral 

 surface ; IV and V subequal, with tubercles as on III; VI, a little longer than V, ex- 

 cavated on its outer lateral surface about two-thirds distance from base. Wing veins 

 mostly brown. Stigma brownish, with interior portion darker. 



Described from many specimens taken October 24, 1887, on leaves of Cornus sangui- 

 nea and C. sericea, where for some time previous they had been very numerous, 

 founding sexed colonies. Usually occurring on the under surface. 



Apterous male. — Width of body, 0.50 m,n ; length of body, 0.89' nm ; length of anten- 

 nas, 0.47 mm . 



Body and members brownish or brownish-black, with numerous brown hairs. 

 Eyes black. Body flattened, long and narrow, with nearly parallel sides. Antennas 

 half as long as body. Joint I, short, swollen; II, small; III, longest; IV and V, 

 subequal; the latter excavated on its apical lateral surface. Legs long, robust, 

 same color as body. Rostrum robust, reaching anterior margin of posterior coxas. 



Described from several living specimens (part taken in copula) from Cornus sericea, 

 collected October 24, 1887. 



Oviparous female.— Width of body, 0.50 mm ; length of body, 1.14 mm ; length of an- 

 tennas, 0.35 mm . 



Green, or greenish-brown, slightly darker anteriorly.. Shape, elongate oval; sparsely 

 clothed with brown hairs. Eyes blackish. Antennas green, slightly darker apically ; 

 ^oint III longest, V slightly swollen in middle. Rostrum robust, green, darker at tip, 

 reaching anterior margin of posterior coxas. Legs unicolorous with body, dusky 

 apically. 



Egg.— Elongate oval, 0.56 mm long, 0.20 mm wide. 



Green at first, becoming black by exposure. Deposited on bark, in and about the 

 axils of buds and small branches. 



Described from many specimens on Cornus sericea, October 24, 1887. 



These descriptions are so full that I deem it unnecessary to draw up 

 another. I may mention, however, that the apterous males usually 

 have what I should call a purplish tint with the brownish color when 

 alive, due, perhaps, entirely to the delicate bloom covering them. 



The most distinctive character of corni is perhaps the hairy antenna 

 and the six or seven circular sensoria on underside of the third antenual 

 joint. The number of these sensoria varies slightly, but in the form I 



