424 Records of the Indian Museum. [Voi,. XXIV, 



but more numerous than in the male. Between them are numerous 

 smaller, evenly sized spines. 



Wings a little enfumed, stigma light brown, the difference in 



12—17 

 size even more marked than in the male ; nodal index - 



II-I0 



otherwise similar to the male. 



17-12 



ii-ii 



Onychogomphus bistrigatus Selys. 



A single male from Kalar, Nilgiris, 1000 ft., V1917, coll. F. C. Fraser. 

 The specimen agrees so minutely with the Selysian descrip- 

 tion of the type female that there can be no doubt that the insects 

 are conspecific. 



Abdomen 38 mm. Hindwing 29 mm. 



Abdominal segments 8 and 9 are black with a small basal 

 lateral yellow spot, whilst 10 is all black. 



The anal appendages are yellow, the superior tipped with 

 black, the inferior black externally, yellow internally. The supe- 

 rior has a small spine inwardly at the junction of the last two- 

 thirds, the inferior has only a basal tooth at its, basal third, 

 otherwise as for 0. uncatus Selys. 

 • 

 Onychogomphus biforceps Selys. 



A single female from Palghat, Malabar Dist., coll.T. N. Hearsey, i6*vi* 

 21. 



Female. Abdomen 42 .mm. Hindwing 35 mm. 



The insect is somewhat stouter and larger than the female of 

 O. biforceps nilgiriensis and the markings differ considerably ; the 

 7th and 8th abdominal segments are also more dilated. 



Differs in markings as follows : spots on labrum large, in fact 

 it would be more correct to say that this structure is yellow, 

 narrowly bordered with black, the narrow belt of black at base 

 connected narrowly in the middle line with the anterior bordering 

 black ; base of mandibles, lower part of epistome and a spot on 

 either side of upper yellow ; band on frons complete ; occiput 

 yellow at its centre and raised into a single point in the middle 

 (humeral stripe absent, antehumeral oblique, not connected with 

 the mesothoracic collar which is slightly interrupted). Laterally 

 the broad median black stripe is traversed by a narrow irregular 

 yellow stripe. 



Ivegs. Femora yellow mottled with black, the hind femora 

 with a row of closely set, very short, very robust spines, 9 to 10 

 in number. 



Abdominal markings similar but the basal spot on segment 8 

 very large. 



Anal appendage entirely yellow, as is also the apex of the 

 intermediate conical process. 



Vulvar scale light reddish brown, very short and broad, 

 deeply notched in the middle, reset in a hollow of the 9th segment. 



