Vol. xxii] ENTOMOLOGICAL NEWS. 44I 



at tip; antennae about the same as in the alate form; numerous sen- 

 soria on joints 3, 4 and 5; joints 3 and 4 often coalesced on one or 

 both sides. 



The most striking peculiarity of this louse is the entire ab- 

 sence of tarsi in all stages. There seems to be no modification 

 of form too difficult for nature to bring about if it is needed 

 and if sufficient time be given. This louse is undoubtedly bet- 

 ter able to travel over the sticky surface of the Grindelia leaves 

 without tarsi than with them. Yet two other species of lice 

 having well developed tarsi get along well enough on the same 

 plant. 



On June 17 and 18 at Fort Collins the lice were common 

 among the young, tender leaves of the host plant, but no alate 

 lice or pupa could be found. The alate lice were migrating 

 freely two weeks ago. A rather common species from Fort 

 Collins to Denver at least, and taken many times by both Mr. 

 L. C. Bragg and the writer. 



Brachycolus tritici n. sp. (Plate XVI, Figs. 7-9.) 



Alate Viviparous Female. — Specimens taken from leaves of 

 Colorado blue-stem, Agropyron glaucum, at Fort Collins, Colo., 

 May 24, 191 1, by L. C. Bragg. 



Head, thorax above and below, antenna, except basal portion of 

 3rd joint, e3'es, tarsi, distal ends of tibiae, and the greater portion of 

 the distal ends of the femora, cauda and anal plate black, and pow- 

 dered with white. Wing veins also conspicuously black, stigma blackish 

 and rather narrow and stigmal vein nearly straight ; cubital twice 

 forked; abdomen light green, the color of the leaves of the grass and 

 lightly powdered with white ; cauda stout, broad in basal portion, 

 pointed, and more or less dusky ; cornicles a little yellowish or brownish 

 and slightly raised above the surface, not as long as broad ; vertex 

 broad and but little convex ; no antennal tubercles ; length of body 

 1.30 to 1.50 mm.; antenna .70 to .80 mm.; joints 4, 5 and 6 about equal; 

 spur a little longer than joint 4; joint 3 a little shorter than joints 

 4 and 5 together. There is an irregular row of about 8 sensoria on 

 distal two-thirds of joint 3 and about 2 sensoria on joint 4; length of 

 wing, 2.30 mm. 



Apterous Viviparous Female. — Body long and narrow, nearly paral- 

 lel-sided, and rather densely covered with a tine white powder ; length 

 about 1.88 mm.; width .60 mm. The general color is pale greenish to 



