336 Records of the Indian Museum. [Voi,. XIII, 



L". didynia. C. bimaculata. 



Pi'otlwrax ' Black with large light round spot j Yellow with anterior and poste- 

 ■ ' ( on each side. ( rior margins black. 



Y-, f An upper pair of small blue spots C n • r- l 



1 11 or ax ... I „^!:J:.uJt ■ ^u ^ \ iJpper pair of spots absent. 



( near the wings on the dorsum. (^ t-f f f 



Abdomen ' Segment i black above, yellow ( Segment i yellow with semicir- 



■ ( at the sides. \ cular brown mark anteriorly. 



Size ... Hind-wing 24 mm. ... Hind-wing 22 mm. 



It must be noted that the anal appendages of the described 

 specimens are very similar. 



Coeliccia albicauda (Forster), 



Trichocnemis octogesima albicauda, Forster (as race). 

 Trichocnemis borneensis, Laidlaw (nee. Selys), lac. cit. 



Some time ago I re-examined the male specimen which I had 

 regarded as probably belonging to Selys' species. I found it to 

 agree with the form described by Forster as a race of oc^og'mwa, and 

 now believe it to have been identical with that form, which is cer- 

 tainly distinct from the true octogesima and worthy of specific rank. 

 Unfortunately the two specimens, male and female, taken in copula 

 at Kwala Aring have been destroyed in the meantime. 



I have examined specimens of several species from Borneo, 

 male and female, and find so much resemblance amongst the 

 females that in my opinion it will be a matter of no little difficulty 

 to determine in the future what is the male of the real borneensis. 



The present species differs then obviously from C. octogesima 

 in that the female has no antehumeral band ; and is also almost 

 certainly distinct from C. borneensis. 



It is to be hoped that material from the type locality may be 

 forthcoming, which will settle the question. 



I have been able to identify a larval form from Kalimpong as be- 

 longing to Ca^/cwem^s (No. 85/H.I., April-May, 1910, F. H. Gravely). 

 It is very different in appearance from the larva of Copera annu- 

 lata, its legs are relatively short, the body stouter and instead of 

 the very long gill lamellae of Copera there are very short strongly 

 ridged lamellae, shaped like a spear-head, triradiate in transverse 

 section, not so long as the mask. The differences between the two 

 larvas are so striking as to suggest that the two genera are not 

 really closely related, but show a convergent similarity in their 

 venation. A point of interest and one that will perhaps help to 

 throw light on the question is that in the Calicnemis larva I have 

 been able to determine that the tracheae which supply RS and Mg 

 rise from a common stalk from the main trunk of M. This feature 

 may be the explanation of the remarkable venation found in 

 Prionocnemis. 



Genus Copera, Kirby. 



(= Psilocnemis , Selys). 



Copera annulata (Selys). 



Copera annulata, Kirby, Cat. Odonata, p. 129 (1890). 

 Copera annulata stevensi, Laidlaw, Rec. Ind. Mus. \"1I[, iv, p. 341, 

 1)1. .\vi, fig. 2 (1914). 



