igz Records of the Indian Mnsemn. [Vol. XVI, 



In P. rubriceps, Selys, and to a lesser extent in P. hen^alensc, 

 nom. nov., in which the upper anal appendages are black, the 

 large excavation at the apex of segment lo is bright blue. In P. 

 hypermelas, Selys, and in P. microcephalum (Ratnb.) the ' recogni- 

 tion-mark ' consists of an area of blue colour on the shelf-like 

 projection found on the inner side of the upper anal appendages. 

 In old males of P. hypermelas this mark tends to become ob- 

 scured. 



One other Indian Agrionine possesses a similar colour on the 

 upper anal appendages of the male, viz. Ischnura forcipata (Laid- 

 law), 



For notes on Indian species of this genus see Rec. Ind. Mus., 

 XII, pp. 21-25 (1916). 



Pscudagrion bengalense, nom. nov. 

 (Text-fig. 4.) 



Pseiidagi'io)! aiistialasiae, Selys MSS.; I.aidiaw, Rcc. ImL Mas.', XII 

 p. 23 (1Q16). 



The two specimens of this species which I have seen are both 

 males from Calcutta. 



According to a recent paper by Dr. Ris {Supplementa Ento- 



mologica, No. 5, Berlin) the true 

 Race ? Pseudagrion aiistralasiae of 

 «/^J ~ the synopsis is a local race of P. 



\^ — microcephalum found in Austra- 



lia and parts of the Malay Archi- 

 ll m. ^.-Psenda^gvi^^^^ bcngale„se. peiago. This race probably does 



. ,' . J not occur in India, and the two 



Apex ol: abdomen. . . ,' . ,. 



specimens exammed (one or them 



labelled by Selys himself as P. aus- 

 iralasiae) are quite different from the Indian examples of P. 

 microcephalum taken with one of them. 



In general appearance it must be admitted that the two 

 species, P. microcephalum, Selys and P. bengalense , are ver}' much 

 alike. 



The differences may best be shown in tabular form : — 

 P. bengalense cf . P. microcephalum cf . 



Size Abd. 30mm.; hind- Abd. 27-5 mm.; hind-wing 



wing 20'5 mm. (and 18 mm. 



in general a more ro- 

 bust species). 



Head. A broad black band Narrow transverse band of 



transversely across black at level of posterior 



the frons from level ocelli, black mark on either 



of base of antennae side of anterior ocellus. Dor- 



to level of posterior sum of head mainly blue, 



ocellus. Dorsum of 

 head mainly black. 



