194 THE CANADIAN ENTOMOLOGIST 



threads that are used by them with which to cover their eggs. 

 Males, so far as known, apterous and very small. 



When the alate form of hallii was described, the writer had 

 but a single example in balsam, which did not show the first cross- 

 vein of the hind wing and it was so described and figured, and is 

 probably one of the reasons why Mr. Baker includes this species 

 in Saltusaphis. Many alate examples of closely allied species 

 have since been taken which plainly show the first cross- vein, 

 even after being put in balsam, so I do not think the presence 

 or absence of this vein should be given generic importance in the 

 group to which ballii belongs. 



While Callipteriis flabeUus Sanb. does not have the bifid pre- 

 caudal tergite that is so strong a character in the type of the genus 

 Saltusaphis, I believe Mr. Baker is right in placing it with that 

 genus, for it qualifies in all other important respects and does have 

 a large eighth tergite bearing tuberculate hairs as in scirpus Theo- 

 bald. 



Thripsaphis ballii Gill. 



This species is separated rather easily separated from, at 

 least, three other Colorado forms that are congeneric with it, 

 by the short antenna, which, in the alate form, has about 7 

 small circular sensoria on the third joint, and in the apterous 

 form none, the absence of the first transverse vein in the hind 

 wing of the alate louse, the moderately produced vertex, the short 

 and broadly rounded eighth tergite and the stout femora of the 

 apterous viviparous form. See Plate XI, figures 5, 6, 7. 



Thripsaphis verrucosa, n. sp. 



In the original description of hallii the writer mistook for it 

 the egg-layer of what now proves to be a distinct but closely 

 allied form. See Canadian Entomologist, vol. XL, p, 67 (apterous 

 viviparous female), and plate III, figures 12 and 14. This form 

 must be segregated from hallii, and for it I suggest the specific 

 name verrucosa, because of the prominent projection on the vertex. 

 See also Plate XI, figure 4, accompanying this paper. The other 

 forms for the year have not been thoroughly worked out, so are 

 held for later descriptions. 



