172 



Records of the Indian Museum. 



[Vol.. XVI, 



24 

 25 



^6 



27 

 28 

 29 

 30 



Genis. 



Ceriagrio)! 



Species. 



* pallidum, Selys. 

 ■* tillyardi, n. sp. 



* hisopa, Selys. 

 nppi'oximaiis, Selys. 



Range. 



India, Assam, Burma. 



Assam. 



India, Assam, Burma. 



Assam 



32 

 33 



34 



35 

 36 

 37 

 38 



39 

 40 



Pseudagrion 



* cocriileiim, n. sp. 



* olivaceuni, Laidlaw. 



* rubiae, Laidlaw. 



* co7'oma>ideli anil 711 



(Fabr.) 



* cermuyubelliini (Bra- Orienta 



uer). 

 fallax, Ris. 



* nielanurum, Selys. 



Darjiling District. 

 Assam. 



Peninsular India. 

 Oriental. 



* inicroceplialiiin 



(Ramb.) 



* bengaletise, n. n. Bengal. 



* decoriiyn (Ramb ) India. 



* hypeymelas, Selys. India. 

 bidentatnm, Morton. N. India. 



* rubriceps, Selys. India. 

 aztireum, Selj's. Burma. 



Burma. 



Sumatra to Japan. 

 Old-world tropics. 

 Oriental, Australia. 



Species whose occurrence, position or characterization is 

 doubtful. 



Cei'iagrion 

 Argiociieinis 



Aychibasis 



erubesceiis, Se\ys. 



liijiiilafa, Laidlaw. 



obsciii-a, Laidlaw. 



ceylonica, Kirby. 

 oscilla/ts (Selys). 



May occur in Burma. 



Doubtfully distinct from A.ru- 



bescens. 

 Assam. 



A Pseudagrion. 

 Position doubtful. 



Legion Argia. 



Genus Onychargia. 



Onychargia atrocyana, Selys. 



Onychargia atrocyana, Kirby, Cat. Odonata, p. 139 (1890) ; K^nhyjjonrn. 

 Linn. Soc. London, ZooL, XXIV, p. 563 (,1893). 



I f^' I 9 (imperfect). Sibsagar, Assam ( (^ 320/20 ; $ 6314/1). 



Labelled Onychargia vittigera in Selys' own writing (see 

 Synopsis^ p 417). 



Legion Agrion. 

 Genus Ischnura. 



I have thought it advisable to make a new genus to contain 

 the aberrant /. nursei of Morton. 



The genus Ischnura is particularly interesting because of 

 the existence in some species at least of two distinct colour-forms 

 of the female (dimorphism), and because of the colouring of the 

 pterostigtnata of the fore-wing in the males which are heterochrom- 

 atic, i.e. differ in colour from those of the hinder-wings. Both 

 these features occur also in Agriocnemis. 



