1922.] F. C. Fkaser & C. Dover : Fauna of Barkuda I. 309 



flight ; remainder of abdomen purplish-black fading to purplish- 

 brown on the ventral surfaces, with paler markings orange or yellow. 

 Legs black ; femora brownish at base. A large yellow patch on 

 hindwing." 



Four of the specimens in our collection from the island were 

 hatched in captivity from larvae found in the pond, one being 

 nearly three months in its strange surroundings before this event 

 took place. 



Fraser has recently carried out prolonged breeding experi- 

 ments with this insect and finds that they prey readily on one an- 

 other in preference to all other food. As larvae were found in 

 great numbers in two tanks, it is probable that this cannibalism 

 goes on freely under natural conditions and must contribute largely 

 to cutting down the numbers of the insect. 



Fish also were found to be attacked, the eyes being the in- 

 variable point of attack. One fish so attacked and partially eaten 

 was over 2 inches in length. Tadpoles were found to be immune 

 and lived on amicable terms with the larvae. Probably the fish 

 approach the head of larvae to examine them and see if they are 

 good to eat, thus rendering themselves liable to attack. 



The larvae only feed at night during which period they are as 

 active as they are sluggish in the day-time. A bowl of larvae ap- 

 proached at night and seen under the rays of a lamp was seen to 

 be in the wildest commotion, the larvae plunging in every direction 

 seeking for cover. 



Zygoptera. 



Family COENAGRIONIDAE. 



Subfamily COENAGRIONINAE. 



Ceriagrion coromandelianum Fabr. 



Agrion coromandelianum , Ent. Syst., p. 287 (1798) ; Selys, Bull. Acad. 

 Belg. (2) XLII, p. 528(1876); Ramb. (Agrion cerinum), Ins. Neur., 

 p. 529 ( 1842) ; Laidlaw (C. coromandelianum), Rec. Ind. Mus. XII, 

 p. 132 (1916); id., Rec. Ind. Mus. XVI, p. 190 (1919). 



Barkuda, many specimens, viiirg (Annandale, "from pond," 

 "in jungle"); viii'2o {Dover and Ribeiro, " larvae caught in pond 

 on i6-viii - 2o, hatched, i8"vni'Zo"). 



A common species, endemic on Barkuda. 



Enallagma insula P'raser. 



Rec. Ind. Mus. XIX, p. 32, 9 (1920). 



Barkuda, one specimen, 5'xTg (Annandale). 

 A unique specimen. 



Agriocnemis pygmaea Ramb. 



Agrion. pygmaeum, Ins. Neur., p. 278 (1842); Selys, Bull. Acad. Belg. 

 (2), XLII I, p. 142 (1877; ! Kirby, Cat. Odon., p. 158 (1890). 



