20 



BULLETIN 276, U. S. DEPARTMENT OF AGRICULTURE. 



small area at base of III, which are pale dusky; sparsely covered with 

 delicate, inconspicuous hairs; segment III bearing 40 to 50 irregu- 

 larly placed circular sensoria, IV bare, .V with 10 to 15 circular sen- 

 soria, not including the usual distal one, more or less in a row but 

 more thickly placed toward the apex; base of VI with the usual distal 

 ones. Beak whitish yellow, the tip black; reaching beyond the coxae 

 of the hrst pair of legs but not to the middle coxae. Wings as in the 

 viviparous female. Legs long and slender, the femur pale yellowish 

 to yellowish green, becoming blackish on the distal third, tibia pale 

 brown and the tip black, tarsus black. Cornicles as in viviparous 

 forms, pale with a slight duskiness and the tip blackish. Cauda 

 ensiform and bearing moderately long hairs as in other forms, and 

 pale dusky to dusky in color. 



Measurements of body dimensions not made from living specimens 

 and mounted individuals are slightly shriveled. The male is con- 

 siderably smaller than the viviparous female. Measurements from 

 specimens mounted in balsam except as noted: Length of body, 1.4 

 mm., to tip of cauda, 1.55, width, 0.52; length of wing, 2.87 mm., 

 width, 1.04; length of cornicle, 0.38 mm.; length of cauda, 0.20 mm. 

 Measurements of antennal segments: 



I. 



II. 



III. 



IV. 



V. 



VI base. 



VI fila- 

 ment. 



Mm. 



Mm. 



Mm. 



Mm. 



' Mm. 



Mm. 



Mm. 



0.156 



0.069 



0.696 



0.539 



0.626 



0.217 



10.852 



.156 



.069 



.696 



.547 



.609 



.243 



11.008 



.148 



.069 



.626 



.435 



.504 



.217 



2.852 



.148 



.069 



.626 



.400 



.495 



.191 



2.800 



.139 



.069 





.435 



.469 



.174 



( 2 ) 





1 Measured immediately after placing in balsam. 



2 Specimens killed in 70 per cent alcohol, mounted in balsam the following day, and measured immedi- 

 ately afterwards. 



Wingless male (fig. 8). — (Described from two specimens, one 

 observed in copula, October 18, 1911.) Head dusky brown, thoracic 

 segments and first abdominal segment pale yellowish; remainder of 

 abdomen pale green with dusky markings as follows: One spot on 

 each side, dorsolateral in position, on the thoracic segments and the 

 first five or six abdominal segments, those on the first two thoracic 

 segments very faint, the others gradually larger, those on the first 

 three abdominal segments being transverse markings rather than 

 simple dots, and the markings on the following abdominal segments, 

 dots or small circular spots. Antennae situated on prominent 

 frontal tubercles; much longer than the body; sparsely hairy; fila- 

 ment of segment VI longer than III; I and II dusky brown to black- 

 ish; III black, excepting paler extreme base; IV dark brownish and 

 black at tip; V black, excepting a small port urn at the base which is 

 brownish, and VI black; segment III bearing 47 to 57 irregularly 



