164 MESSES. H. J. ELWES AND JAMES EDWARDS : 



postmedian band of small white spots and a narrow white spot on the transverse vein, 

 and on the fore wing below there are two small suffused white spots near the apical 

 third of cell 1 a, separated by the intraneural fold. Having regard to the relationship 

 of T. montanus and T. nigrescens, it is possible that sinina is really a distinct species 

 from T. tages, but we have had no opportunity of comparing their male genitalia. 



T. Cervantes, Grasl., is a larger and darker form, which prevails in Andalusia, 

 but the male genitalia are identical with those of typical T. tages, L. 



! Thanaos montanus. (Plate XXIII. fig. 34.) 

 Pyrgus montanus, Bremer, Bull. Acad. Petr. iii. p. 473 (1861) ; id. Lep. Ost-Sib. p. 31, pi. ii. fig. 4 



(1864) . 

 Thanaos rusticanus, Butler, Jour. Linn. Soc, Zool. ix. p. 58 (1866). 

 Nisoniades montanus, Pryer, Rhop. Nihon. p. 35, pi. x. fig. 23 (1889). 

 Thanaos montanus, Leech, Butt. China &c. p. 580. 



Hab. Amurland, Japan, China. 



! Thanaos leechii, n. sp. (Plate XXIII. fig. 35.) 



Thanaos montanus, var. nigrescens, Leech, Butt. China &c. p. 581, pi. xlii. fig. 2, <$ (1894), 



Distinguished from T. montanus by the characters given in the table above, of 

 which the most constant are its smaller size and different male genitalia. The 

 tegumen expands near the middle into two small, triangular, smooth, lateral dorsal 

 lobes, as in T. montanus, but these are not subtended, as in that species, by a pair of 

 much larger spinose lobes. 



Hab. Wa-ssu-Kow, Ta-tsien-lu, W. China (fide Leech) ; Tchang-Kou, Tibet (fide 

 Oberthur). 



! Thanaos maeloyi. (Plate XXITI. figs. 32, 32 a.) 



Thanaos marloyi, Boisduval, Icones. pi. ilvii. figs. 6, 7 (1832). 



Hesperia sericea, Freyer, Neuere Beitr. iii. pi. ccxlv. fig. 4 (1838) ; Herrich-Schaffer, Schmett. 

 Eur. L, Hesp. figs. 29, 30 (1816). 



Hab. S.E. Europe, Asia Minor, N. Persia, Syria. 

 ! Thanaos pelias. (Plate XXIII. figs. 33, 33 a.) 



Nisoniades pelias, Leech, Entomologist, xxiv. Suppl. p. 60 (June 1891). 

 Nisoniades erebus, Groum-Grshima'ilo, Horse Soc. Ent. Ross. xxv. p. 461 (1891). 

 Thanaos pelias, Leech, Butt. China &c. p. 581, pi. xlii. fig. 3, J 1 (1893-94) . 



The male genitalia of T. pelias, Leech, and T. erebus, Gr.-Gr., are identical in form, 

 as Ave find on examination of authentic specimens of each. 



Hab. W. China, E. Tibet (Pratt) ■ N.E. Tibet (Groum-Grshimailo). 



