THE CANADIAN ENTOMOLOGIST 193 



T\V(J NEW APHID GENERA AND SOME NEW SPECIES. 



BY C. P. GILLETTE, FORT COLLINS, COL. 



In Canadian Entomologist, vol. XL, 1908, p. 67; and in Ento- 

 mological News, vol. XX, 1909, p. 119. the writer described 

 and figured a peculiar aphid from Carex under the specific name of 

 ballii and placed it in the genus Brachycohts, with a remark to the 

 effect that it did not seem to belong to any known genus. 



The appearance of Mr. A. C. Baker's paper, "Synopsis of 

 the Genus Saltusaphis,'' in the "January (1917) number of the 

 Canadian Entomologist, leads me to publish the characterization 

 of a new genus — Thripsaphis — with balUi Gill, as the type, as this 

 aphid seems to me generically distinct from Saltusaphis Theobald. 

 In giving his characterization of this genus, Theobald says: 



*"Head \ery large. . . Cornicles small, cup-shaped. 

 fCauda in both form.s bifid. . . Body hairs fan-shaped or 

 sickle-shaped," and attention is specially called to the single 

 cross-vein in the hind wing and the jumping habit of the type 

 species, scirpus. None of these characters apply to ballii except 

 the venation of the hind wing, and that does not hold for other 

 very closely allied species. ~ 



Thripsaphis, n. gen. 



General form \-ery long and slender; eyes without ocular 

 tubercles; antennae 6-jointed; anterior wings normal in venation, 

 but the first cross-vein in the hind wing weak, or absent in some 

 cases, and easily overlooked when present, if mounted in balsam; 

 cornicles represented by pores only; cauda strongly knobbed; 

 precaudal tergite entire ; anal plate strongly bi-lobed; gonapo- 

 physes .2; body hairs few and not blunt ended or in form of flabellse; 

 vertex prominent, and the oviparous females, so far as known, 

 have wax glands on the lateral ventral surfaces of the abdomen, 

 just caudad of the cornicle pores, from which are secreted wax 



*African Aphididae — Part II, in Bulletin of Entomological Research, \'ol. 

 VI, pt. II, p. 1.38, 1915. 



tl have examples of Saltusaphis scirpus from Theobald. It is evident that 

 he mistook the extended and strongly bi-lobed precaudal tergite for a bi-lobed 

 cauda. The cauda has a large and typical knob with a narrowly constricted 

 neck which was mistaken by Theobald for the anal plate. The anal plate is 

 bi-lobed also, as in the Colorado species, flabellus Gill. 

 June, 1917. 



