141 



shown us the correctness of our identification ; iiow Mr. Pearsall ever 

 came to associate this Colorado race with incursata Hbn. as he evi- 

 dently did, judging by his paper, must remain a mystery; it exactly 

 resembles a large specimen of the common form of abrasaria found 

 in the White Mts., N. H., and to which the name congregata Wlk. 

 applies. The tnie incursata (or at least a very closely allied race of 

 the same) occurs in this country at high altitudes in the Canadian 

 Rockies ; we have a series from Laggan and Banff. 



Genus Nasusina Pears. (PI. XV, Fig. 7). 



Following a discussion by Grossbeck (1908, Jour. N. Y. Ent. Soc. 

 XVI, 21) of the genus GymnosccUs Mab. and the species included 

 in it by Hulst in which the variability of the number of pairs of spurs 

 on the hind tibiae was pointed out Pearsall ( 1908, Can. Ent. XL, 344) 

 erected the genus Nasusina for seven species which he claimed all 

 possessed a similar nose-like frontal prominence; he designated as 

 type the species inferior Hist. The choice of inferior as the type 

 of the genus is singularly unfortunate as this species does not possess 

 the cone-like prominence found in gypsata Grt. and its allies as has 

 been already noted by Grossbeck in the above mentioned article ; in this 

 species however the front is distinctly roundedly bulging, being con- 

 siderably raised between the eyes, and is covered with a closely 

 appressed thick mat of scales giving a very distinctive appearance 

 quite in contrast to what is found in typical Eupithecia species where 

 we have a flat sloping front with merely a terminal tuft of scales 

 protruding between the palpi. We think therefore that the genus 

 will hold, but so far as our investigations go should be made to include 

 only three species, viz, inferior Hist., minufa Hist, and vaporata Pears. 

 Of these last two species vaporata was described as a Eupithecia but 

 has exactly the same style of raised front as inferior, our own opinion 

 regarding this species being confirmed by Mr. F. E. Watson who has 

 kindly examined the type specimens for us; minuta Hist, has been 

 included in Mabille's genus Gymnoscelis on the strength of the single 

 pair of spurs on the hind tibiae; this genus, based on the European 

 species pumilata Hbn., is however characterized by Meyrick as pos- 

 sessing a similar cone of scales on the front to that of Eupithecia ( 1892, 

 Tr. Lond. Ent. Soc. p. 65) and Rebel (Spuler, Schmett. Eur. II. 68) 

 notes the fact that veins 6 and 7 of secondaries are always unstalked ; 



