28 



it does not ag-ree with any of the green species known to me, I have 

 conduded to describe it as new, particularly as it nui}^ occasionall}- 

 prove to become very injurious to grain. 



DESCRIPTION OF THE SPECIES. 



Apterous female. — Length of body 2.4 to 3™'". Antenme slender, reaching to or 

 beyond the tip of the tail; third joint shorter than the sixth, provided with one to 

 three small circular and elevated sensoria; hairs niinnte, sparse, and simple. 

 Nectaries very long and slender and longer than the third antennal joint; much 

 thinner at the apex than at the base, curved upward and reaching to or Iteyond the 

 tip of the tail; tail long, tapering, more than half the length of the nectaries, densely 

 spiny, and provided each side with four l)ack ward-curved hairs. Color, green or 

 yellowish green, and frequently slighly pruinoua, most densely so on the head and 

 incisures of the body l)eneath, giving these parts a whitish cast; the median line of 

 the body is generally of a darker green. The eyes are brown. The antennae of the 

 fully mature specimens are black, with the two basal joints more or less distinctly 

 yellowish; in younger specimens they appear yellowish, with the apex of joints 

 three to five and the last one black. The nectaries are usually yellowish or slightly 

 dusky, changing to l)lack toward the apex and greenish toward the base. Tail pale 

 greenish or yellowish. Legs i)ale brownish-yellow, base of femora greenish; apex of 

 tibiae and the tarsi black. 



Migratory female. — Length of ])ody 2 to 2.4 """'; exi^anse of wings S.4 to 9 "™. 

 Antennae slender and much longer than the body, the third joint much shorter than 

 the sixth; the sensoria of the third joint are much more numerous than in that of 

 the other two species found on grain, covering about three-fourths of the posterior 

 edge of its base and ranging between 13 and 18 or more. The hairs of the antenuie are 

 also longer and generally simple, though sometimes also faintly clavate. The nec- 

 taries are verj' long and slender, but slightly stoutest at base, reaching far beyond 

 the tip of the tail and at least as long as the third antennal joint. The tail is of the 

 same shape as usual in this genus and but slightly over one-third the length of the 

 nectaries, usually densely covered with minute sharp spines and bordered each side 

 by four slender bristles. The venation of the wings is as usual, though the. terminal 

 fork is longer than in the other two species. The general color is yellowish-green, 

 the median line of the abdomen darker, though many of the spots wanting. The 

 head and thoracic lobes are yellow or brownish-yellow. Eyes ])rown to black; 

 ocelli clear, bordered with black. Antenufe black, the two basal joints and base of 

 the third either green, brownish-yellow or dusky. Occasionally there are»two black 

 spots at the posterior edge of the metathorax and a black border on the scutellum. 

 Femora green on basal half or more, changing gradually to yellow, lirown and black 

 toward the apex; tibife brownish yellow with base and apex I)lack. Nectaries dusky 

 to black and greenish at base. Tail green or slightly dusky. Wings colorless, their 

 base and subcosta faintly greenish. Stigma pale grayish-green, the veins black. 



Variations by tenths of the comparative length of the antennal joints, etc., are as 

 follows: 



Joint 3, 28 to 35. 



Joint 4, 23 to 30. 



Joint 5, 21 to 25. 



Joint (i, 38 to 43. 



Nectaries, 28 to 31. 



Third fork, 22 to 32. 



Compared with the other two species it will be seen that the propor- 

 tions of these organs are nuich the largest, those of cej'ealls being the 

 smallest. 



The sexual generation or their enemies have not been observed. 



