444 ENTOMOLOGICAL NEWS. [Dec., 'll 



antenna pale yellowish; tips of tibiae and tarsi very black; veins and 

 stigma of wings dusky; cornicles short and stout and broadest at base, 

 where the diameter just about equals the length. Length of body 1.40 

 to 1.50 mm. ; wing 2.25 mm. ; antenna 1.70 mm. ; hind tibiae .85 mm. 

 Joints of antenna: III .40; IV .29; V .27; VI .11; filament .58 mm.; 

 sensoria about 4, on joint 3. 



Described from specimens taken at Boulder, Colo., June i, 

 1911, by L. C. Bragg. 



J have taken the alate lice at Fort Collins as early as May 25. 



Apterous Viviparous Female. General body color almost uniform 

 brownish black, highly polished throughout; antenna black in distal 

 portion to the middle of the third joint; legs black except the proximal 

 one-half of the tibiae which is yellowish in color; cornicles colored 

 like the body, tuberculate, not longer than broad, cylindrical, without 

 flange; prothorax with stout, blunt tubercles; body, legs and antennae 

 with a few weak hairs; antennae not upon distinct tubercles; vertex 

 moderately convex; cauda small, broader than long; antennal joints 

 about as follows: III .34; IV .26; V .23; VI .13; VII .53 mm.; 

 length of body 1.70 to 2 mm.; antenna 1.40 mm.; sensoria i or 2, on 

 Joint 3. Figure 13 is of a stem 9. 



Apterous $ $ and oviparous 9 9 were seen in September 

 upon the same host plant but have not been described. 



While this louse does not seem to be very common, it fre- 

 quently becomes very abundant upon individual plants of Ar- 

 temisia dracunculoides. 



The younger larvae are decidedly green in color. 



EXPLANATION OF PLATE XVI. 



Atarsos grindeliae : I, alate agamic female; 2, apterous form of 

 same; 3, antenna; 4, cornicle; 5, footless tibia of alate form; 6, antenna 

 of apterous form. 



Brachycolus tritici: 7, apterous, and 8, alate viviparae; 9. antenna of 

 alate form. 



Chaitophorus agropyronensis: 10, alate and u, apterous viviparae; 

 12, antenna of alate form. 



Chaitophorus artemisiae: 13, stem-mother; 14, alate agamic form; 

 15, antenna of alate form; and 16, third joint of antenna of apterous 

 summer form of same louse, but in most examples there is but one 

 sensorinm. 



All the figures of lice are enlarged 15 times; figures of antennae 

 and other small parts, 52 times. 



Drawings by Miss M. A. Palmer. 



