from the Amazons &c. 603 



Closely allied to P. bella, Kirb., but slightly larger. The 

 male is tinged with deep orange-yellow, with only the apical 

 area of the fore wings subhyaline ; the pterostigma (which is 

 longer on the hind wings than on the fore wings) is red, 

 bordered below with a black line ; the triangle of the fore 

 wings is sometimes traversed and sometimes open, and is 

 followed by 2 or 3 cells, and there are o cells in the subtrian- 

 gular space. 



In the female the wings are hyaline, the anterior wings 

 with the nodus marked with black and followed by a slight 

 yellow suffusion, and the lower subcostal space slightly and 

 brokenly tinged with yellow; the hind wings are hyaline, 

 with a yellow suffusion, with no brown shade in the middle, 

 extending from a little beyond the triangle nearly to the 

 pterostigma or the costa, and to the level of its middle on the 

 inner margin. The triangle on the fore wings is open, and 

 the subtriangular space consists of one cell only. 



In most other characters this insect agrees with P. bella ; 

 but the series of P. beUa from Santarem and the five specimens 

 of P. Austeni from Manaos appear to exhibit fairly constant 

 characters. 



Manaos, Feb. 10 and 11, 1896. 



Genus Trithemis, Brauer. 



Trithemis jmlla. 



Libellula pulla, Burm. Handb. Ent. ii. p. 855. n. 41 (1839). 

 Trithemis pulla, Kirb. Ann. & Mag. Nat. Hist. (6) xiv. p. 263 (1894). 



Para, Jan. 10; Breves, Jan. 13; Gurupa, Jan. 23; San- 

 tarem, Jan. 30; Obydos, Feb. 2 ; Mosqueiro, March 7, 18D6. 

 One of the commonest of the Amazonian Dragonflies. 



Trithemis Erichsoni. 



Trithemis Erichsmi, Kirb. Ann. & Mag. Nat. Hist. (6) xiv. p. 263 



(1894). 

 Libellula nnimacvMa, Erichs. Schomb. Brit. Guiana, lii. p. 584 (1848). 



Breves, Lower Amazons, Jan. 13 ; W. end of Parana de 

 Buyassu, Jan. 18 and 19 ; Gurupa, Lower Amazons, Jan. 23 

 and Feb. 22; Manaos, Feb. 2; Mosqueiro, Rio de Para, 

 March 10. 



Many specimens. 



Trithemis umhrata. 



Libellula umhrata, Linn. Syst. Nat. (ed. x.) i. p. 545. n. 13 (175S). 



Gurupd, Jan. 23 ; Santarem, Jan. 30 ; Obydos, Feb. 2 ; 



42* 



