BY R. J. TILLY ARD. 241 



the thoracic scheme is not sufficiently different between two 

 species (as in A. colla7'is and A. australis) the form of the occiput 

 will determine the species. 



During the spring of 1908, I was able to collect and to breed 

 out the larvse of four species of Aiistrogomj^hus occurring near 

 Sydney. An account of these is reserved for another paper, it 

 being only necessary to say here that a study of the larvse will 

 probably enable us to subdivide our large and increasing genus 

 into two, or possibly three, homogeneous groups, differing in 

 important respects both in habit and structure. 



Of the new species described in this paper, one was taken by 

 rae first in 1907, on Duck Creek, near Sydney, and appears to be 

 firmly established there, though never common. Another I 

 obtained during my visit to Cooktown in January, 1908. My 

 friend, Mr. Allen, of Cairns, took a very remarkable new species 

 at Atherton, N.Q., in April, 1907, and at the same time found 

 the rare Austrogonq^hus Bisi Martin, of which the female alone 

 was known. Mr. F. P. Dodd, of Kuranda, is the discoverer of 

 another unique male, which I have dedicated to him. Descrip- 

 tions of these species, together with some notes on other rare 

 species, are given below. 



1. AUSTROGOMPHUS MELALEUC.E, n.sp. 



(J. Total length 43 mm.; abdomen 32 mm.; forewing 26 mm.^ 

 hind wing 25 mm. 



Wings : — neuration black. Pterostigyna broad, convex, 

 black, 2 '7 mm. Membrmnde nil. Nodal Indicator 11-13 7-10| 



8-9 6-9 I 



Head: eyes black, a large round yellow spot underneath 

 on the orbits, a smaller spot close to it, in front; occipital 

 ridge 06 mm., yellow; vertex black; ocelli black, collinear, 

 on three equal tubercles; antenncB black, basal joint thickened, a 

 yellow half-circle at bases; front rather large, bright yellow, 

 slightly cleft mediall}'-; 'postclypeus jet black; anteclypeus pale 

 yellow or cream-coloured; labrum same colour, crossed in th& 

 middle by a broad black vertical bar; labium pale dull cream or 

 19 



