366 Mr. H. J. Elwes on the 



know how to distinguish between this species and the 

 next except by the genitalia of the male (cf. Elwes and 

 Edwards' Revision of Oriental Jlesperiid/e, Trans. Zool. 

 Soc. Lond., vol. xiv, part 4, 1897, p. 156 ; PI. XXIII, figs. 24, 

 25, 25a). 



172. H. alveus, Hubn. 



This was very common at Ongodai from June 10th, 

 but I have no specimens certainly belonging to this species 

 from other localities in the Altai. According to Dr. 

 Staudinger's identification of sero^atulm and alveus I 

 have transposed the names, what he calls serrahdie being 

 my alveus and vicc-versd. It seems to me a very difficult 

 question to decide which is right. 



173. H. centauresB, Rbr. 



This was the only species of Hesperia which was at all 

 common in the high Tchuja Mountains, where it occurred 

 from the beginning of June at from 7000 — 8000 feet. I 

 also took in the Bashkaus Valley at about 5000 feet,flying in 

 marshy places near water, what appears to be this species, 

 and received from Ongodai two or three specimens of 

 what may be a variety of it with the white spots on both 

 wings above much better developed. It was also taken 

 by Leder in the East Sayansk Mountains, but is not 

 recorded from Kentei. 



174. Thanaos tages, L. 



I only found this at one place in the Tchuja Valley at 

 about 4000 feet on June I7th. The specimens do not 

 differ from European ones. 



175. Fa7nphila jjalmmon, Pall. 



I did not take this myself, but received a few taken at 

 Ongodai by Jacobson. These belong to the variety 

 described by Christoph as alhiguttata, which I have from 

 Guberli in the South Ural, from Irkut, and from Kamt- 

 schatka. Though this variety appears to be fairly constant 

 in the Altai, it is not so in the Ural, judging by Grura- 

 Grshimailo's specimens. Some from Sutschan in Staud- 

 inger's collection also seem to be intermediate. 



176. P. silvius, Knoch. 



This was fairly common at Ongodai on June 13th, and 

 I took it in the Tchuja Valley on June 18th, but did not 

 see it afterwards. 



