UY R. J. TILL YARD. 641 



though the differentiation has not proceeded nearly as far as in 

 iV. oligoneura. 



£. Unknown. It would be most interesting to find the female 

 and compare its neuration with that of the male. 



4. Orthetrum pruinosum Burmeister. 



A single male of this species taken by me at Cairns in Decem- 

 ber, 1907, exhibits considerable difference from the type, being 

 of smaller size, and lacking pruinescence on the abdomen. 

 Typical 0. pruinosum is found in Java, and the species is repre- 

 sented in India and Ceylon by the race neglectum Fabr., and in 

 the Celebes and Borneo by the race clelia Selys. I cannot do 

 better than quote the remarks of my friend, Dr. Ris of Switzer- 

 land, the expert in Libellulince, on the specimen from Cairns, 

 which I sent him to examine: — "Your specimen extends the 

 limits of the concern (0. pruinosum) to Queensland in a form 

 that is certainly not of the clelia type but of the true pruinosum 

 type, and thus must suggest its origin from the Sunda region, 

 and its way to Australia probably has been across Timor. Your 

 specimen is distinct from 0. pruinosum typical, by the darker 

 colour of the thorax, the absence of pruinosity from the abdomen, 

 the larger and lighter pterostigma, and many reddish nervules on 

 the costal and basal part of the wings — otherwise very similar to 

 the Javanese typical form. The differences are very probably 

 racial, certainly not specific." 



The specimen is chiefly of interest as affording direct evidence 

 of a stream of immigration to the Cape York Peninsula indepen- 

 dent of that across Torres Straits from New Guinea. 



5. Agrionoptera allogenes, n.sp. 

 This species was described by me under the name A. insignis 

 RamburC?) in these Proceedings for 1906 (p. 485). Since that 

 description was published, I have sent specimens of my type- 

 series to Dr. Ris, and he tells me that they are distinct from the 

 type A. insignis Ramb., of Java. The most remarkable character 

 which differentiates them, and one that is quite constant, is that 

 in the typical A. insignis the triangle of the forewing has a cross- 



