6 PROCEEDIXGS OF THE XATIOXAL MUSEUM. vol.. GO. 



10 blue with an occasional black mark on the ])ase of 9. Individuals 

 emerged from the larval state in large numbers on May 23. The 

 specimens that I described as race occidentalia ^ belong to a distinct 

 species subsequently described as pahidense Fraser (see occklentale) . 



ACIAGRION TILLYARDI Laidlaw. 



Plate 1. tiff. 1.1. 



Acmgrion tillijardi Laidt.aw, Kec. Indian [Museum, vol. 10. no. 2. 1919. p. 187. 

 Enallaiima assaniica Fea.ser, .Tourn. Bombay Nat. Hist. Soc vol. 2H, 1919, p. 877. 



Specimens examined. — One male (paratype) from Tura Garo 

 Hills, Assam, 1,550 feet. One n)ale and one female from Shillong 

 (from Major Fraser). 



This is by far the most robust of the species I have seen. The 

 dilatation of segments 8, 9. and 10 of the al)domen is a character not 

 found in othei' specie* of the genus. 



The species appears to be confined to Assam. 



I have not been able to examine the structure of the penis. 



ACIAGRION OCCIDENTALE Laidlaw. 



Plate 1. figs. 11 and 1(i. 



Aciayrlon hisopa (?) race occideiitaUM Latui.aw. Kec. liidian [Museum, vol. 16, 



no. 2, 1919, p. 187. 

 AciugriOH paludense Fuasvax. .Tourn. Bombay Xat. Hist. Soc, 1922, pp. 698-699. 



Specimens examined. — Two males and two females from Ceylon 

 (collection E. E. Green), One male from Cochin Strait (collection 

 Indian Museum). 



It is very unfortuiuite that my brief account of this form is quite 

 incorrect. Nevertheless in accordance with the laws of nomenclature 

 I imagine my name must take precedence over that proposed by 

 Major Fraser. 



My description states that the black mark on segment S of the 

 abdomen has its apex directed toward the hinder end of the segment. 

 This should read " directed toward the base of the segment.'' 



The penis, like that of the next species, has the apex of the third 

 segment cornuate and not truncate as in hisopa. It differs from that 

 of horneense chiefly in not having the most basally situated denticles 

 of the inner surface of this segment enlarged. Like it, it has a 

 bilobed boss on this surface of tliis segment lying ju.st basally to the 

 denticles, whilst the lateral marginal projections are relatively larger 

 and more apically placed. 



The species is quite distinct from hisopa and apparently near 

 horneense. It has been recorded from the Nilgiri Hills southward 

 to Ceylon. 



^Laidlaw, Rec. Indian Museum, vol. 16, no. 2, 191!). 



