712 



DESCRIPTION AND LIFE-HISTORY OF A NEW 

 SPECIES OF NANNOPHLEBIA. 



By R. J. TiLLYARD, M.A., F.E.S. 



(Plate Ixxiv.) 



The genus Nannophlebia belongs to Group i. of the Libellnlince, 

 according to the new and excellent classification of Dr. Ills.* It 

 is easily recognised by the following characters: — Small tenderly- 

 built insects of black and yellow pattern; second cubital cross- 

 vein falling near to, but 7iot right on to, the proximal angle of the 

 triangle in the forewing, and hence no real "suhtriangle" in that 

 wing;t proximal side of triangle in hindwing in line witliarculus. 

 Costal side of triangle of forewing broken, that of hindwing 

 regular. Last antenodal cross-vein of forewing complete; superior 

 sector of triangle in forewing placed far from the anal angle of 

 the triangle. 



In this genus, Dr. Ris places three distinct forms, which he con- 

 siders to be all subspecies of the type, Nannophlebia lorquini 

 Selys. These he distinguishes as follows : — 



1- N. lorquini lorquini {N. lorquini Selys, 1869). Moluccas. 



2. N. lorquini imitans {N. imitans Ris, 1900). Bismarck Archi- 

 pelago. 



3. N. lorquini eludens{N. eludetis Tillyard, 1908). North Queens- 

 land. 



The last-named is considered to be the true Australian form of the 

 species; hence Dr. Ris associated with it two females of consider- 

 ably larger size, and somewhat different markings, recorded from 



* Coll. Zool. du Baron de Selys-Loiigchamps, Fasc. ix. Libeliulinen, 

 Parti., by Dr. F. Ris, 1909, p 658. 



t It is important lo point out, however, that this cross-vein is variable 

 in position, and sometimes (especially in the new species about to be de- 

 scribed) falls almoHt on to the angle of the triangle. It is, therefore, doubt- 

 ful wliether this is a good character on which to Ijase tlie genus. 



