72 MR. F. r. LAIDLAW OX THE [Feb. 4, 



line following the transverse carina in 3-4. On segment 7 a 

 dorsal yellow spot divided longitudinally by the black mid-dors;\l 

 carina. Traces of a transvei-se carina are present on segment 5. 

 The abdomen is shghtly dilated at its base, but from segment 4 

 onwards very slender. 



Coloration in the female as in the male._ The traces of a 

 transverse carina in segment 5 are more distinct laterally. The 

 abdomen is broader and of practically equal cii'cumference 

 throughout. 



In the male there are on the a ntero- inferior surface of the 

 femur 17 short curved teeth directed towards the knee, and 

 increasing in si2;e distally very gi-adually. These are followed by 

 three straight spines inclined in the same dii-ection ; the first of 

 these is the shortest and the last the longest. 



The third femur is pro\-ided on the antero-inferior surface with 

 a row of 23 thorn-like teeth with then- apices directed away 

 from the knee. These increase gradually towards the distal end 

 of the femur. 



*Naxxophya pygm-EA Ramb. 

 Nannophya pygmo&a, Elirby, Cat. Odonata, p. 45, 

 The British Museum has a number of specimens of this species 

 from Singapore. 



Genera of uncertain position. 



Neurocena IDA Hagen. (Plate Y. fig. 1.) 



Zygonyx ida, Hagen, Ter. Ges. Wien, xvii. p. 62 ; Brauer, op. 

 cit, xviii, p. 370 & p. 742 ; Selys, Ann, Soc, Ent, Belg, xii. p, 96 ; 

 id. Ann. & Mag. ISTat, Hist. (4) iii. p. 274 ; id. C. R. Soc. Ent. 

 Belg. xxsv, p, ccxxvii. 



Pseudoinacromia luxuriosa, Karech, Berl. ent. Zeitschr. xxxviii, 

 p. 21. 



Zygonyx ida, id. Ent. Nachr. xxi, p, 203; Calvert, P, Ac. 

 Philad. 1899, p. 246, 



Keurocena ida, Kirby, Ann, t Mag, Nat, Hist, (7) v, p, 541. 



This appears to be an exceedingly variable species, and the 

 single specimen I obtained differs to a certain extent fi-om those 

 described hitherto, so that it seems worth while to give a fairly 

 full account of it. 



The leng-th of the hind wing is 42 mm,, of the abdomen 38 mm. 



The wings are hyaline, faintly tinged with yellow, which becomes 

 vivid towards the outer extremities of the fore wings. In a male 

 in the British Museum Collection the wings are almost colourless. 

 The reticulation is black. 



Fore lolngs. 14 antenodals ; on the left side the outermost is 

 continuous, on the right side discontinuous, 7 to 8 postnodals. 

 Internal triangle of both wings free, discoidal triangle free, (The 

 internal triangle is usually divided into two or three cells ; de 

 Selys states that in two females examined the discoidal triangle 



