392 THE CANADIAN ENTOMOLOGIST, 



Body 1.9, wing 3, antenna! 1.3, cornicles .18 mm. Joints of antenna: 

 III .3^, IV .21, V .20, VI. 1 1, VII. 28 mm. Cornicles cylindrical, without 

 marked thickening towards base, and without flange at distal end. Antennse 

 black, wing veins black, with 2nd fork of cubital vein rather short, stigma 

 rather short and, along with subcostal vein, a little greenish in colour. Hind 

 tibiae I.I mm. long. Prothoracic tubercles rather stout and prominent, 

 and usually the abdominal segments sliow well-developed lateral tubercles. 

 Cauda short, black and upturned ; 3rd joint of antenna with about eiglit 

 moderately tuberculate sensoria. 



Apterous Viviparous Female (Plate 11, Fig. 3), taken along with the alate 

 form. 



Deep, dull, sooty-black throughout, never polished ; tibiae, except distal 

 ends, most of anterior femora, bases of middle and hind femora, third joint 

 of antennae and basal joint of beak, pale yellow or slightly dusky in colour. 

 Body short and broad, almost globular, about 2.5 mm. long by 1.6 mm. 

 broad. I.ength of antenna 1.3 mm., and tlie joints measure about as 

 follows : III .40, IV .24, V .22, VI .11, and VII .24 mm. respectively. 

 Cornicles .26 mm. long, without flange at tip, and somewhat broadened 

 towards the base ; cauda short and upturned. Tubercles of prothorax 

 and abdomen as in the winged form. There is considerable variation in 

 measurements of antennal joints, but joint 3 is longest, and joints 4 and 

 5 are about equal. 

 Apterous Viviparous Female. Taken Sept. 23, '07, at Ft. Collins, Colo. 



Varies httle from early summer form, but is a trifle smaller. Meas- 

 urements vary little from: length, 2.10 mm.; width, i.io mm.; antenna 

 1. 10 mm. ; joints of antenna: III .26, IV .20, V .19, VI .11, VII .23 mm. 

 Cornicles, .2 1 mm. 



Apterous Ma/e (Plate i 1, fig. 5), taken at Ft. Collins, Colo., Oct. 6. 1907. 

 In colour like the females or a litile lighter, the abdomen being a 

 dark olive green when put into alcohol. Length of body, 1.30 mm.; 

 antenna, .94111111.; joints: III .22, IV .16, V .14, VI .10, \TI .20 mm. 

 joint 3 with iS to 10 oval sensoria of varying size, and joint 4 with about 

 half as many. Joints distinctly crenulate, especially those beyond the 3rd. 

 Cornicles, . 1 1 mm. 



Apterous Oviparous Female, taken along with the males above. 



Very similar to viviparous form, but a little smaller, about 1.9 mm. 

 long ; antenna barely i mm. Depositing yellowish-brown eggs about 

 bases of dock stems. The eggs soon become polished black. 



