34 Records of the Indian Museum. [Vol. XIII 



narrow, with amethyst irridescehce and purple 



opacities ... ... ... ... Group fenestruta. 



Mo inesothoracic triangle ; wings of males with rich 

 coppery irridescence. Tibias and femurs of fe- 

 males with light marks on anterior surfaces ... Group timmacti lata. 



The males of the groups immaculata, fenestrella and fenestrata 

 all have the anterior surfaces of the hinder pairs of tibias of a 

 beautiful chalky white colour, which, as Annandale has remarked, 

 are shown conspicuously by them when mating. Of the group 

 unimaculata, the species unimaculata has this surface of the tibias 

 of a yellowish colour, trimaculaia is said by Selys to have them 

 "probably whitish" (Selys, Monograph. Calopt., p, 212); ignipen- 

 nis seems to be without this character. In passing it may be 

 remarked that the males of the Bornean species R. cucullala, Selys, 

 have the anterior surface of the two hinder pairs of tibias not 

 white but of a vivid chalky blue. 



Group Immaculata. 



21. Rhinocypha trifasciata, Selys. 



(PI. 11, fig. 2). 



/?. ti'ifasciata, Kirby, Cat. Odonata, p. 113 (1890). 



5 & & . Kailana, N.-W. Provinces (/. C. Moulton). 



It seems likely that this form has a westernly distribution, 

 whilst the next, viz. R. bifasciata, Selys, is its representative in 

 Burma and Assam. 



22. Rhinocypha bifasciata, Selys. 



R. bifasciata, Kirby, Cat. Odonata, p. 113. 



3 cr* cf. Gopaldhara [E. Stevens). 



This form is so closely allied to the preceding that it may be 

 treated as a local race ; or, by reason of its differences from R. 

 trifasciata being constant, as a distinct species according to the 

 views held by the list maker. I prefer to treat it as distinct as a 

 matter of convenience, 



1 5 (?). Gopaldhara, 4-X-14 {H. Stevens). 



The mesothoracic triangle is continued up to the antealar 

 sinus, the outer two-thirds of the pterostigma is of a bright-yellow 

 colour. The mesothoracic triangle is not by any means as broad 

 as in the female of R. immaculata, where it equals in size that of 

 the male. Antero-lateral bands and postero-lateral spots are 

 present on segments 2, 3, 4 of the abdomen. The specimen is 

 fully adult. 



23. Rhinocypha immaculata, Selys. 



R. unimaculata, Kirby, Cat. Odonata, p. 113 (misprint). 

 R. inunacitlata, id., ibid., p. 186. 



2 d* a' 3 ? 9 (-to-), Cherrapunji, Assam, 4,400 ft., 2— 8-x-r4 

 (S. W. Kemp). 



