762 STUDIES IN AUSTRALIAN NEUROPTERA, vi., 



Psychopsini, as defined by Navas. Thus we come to a rpductio 

 ad ahsurditm, which it is not necessary to pursue any further. 

 The only remedy is to admit, at once, that the tribal characters 

 under discussion are of no value, and to suppress the tribe Zygo- 

 phlebini altogether. We are then left with only the tribal name 

 Psychopsini, which ceases to have any value as restricted by 

 Navas' definition, and may be disregarded; leaving us with a 

 single family of closely united species, the Psychopsidce, within 

 which no legitimate tribal divisions can so far be recognised. 



Having settled these questions, we may now proceed to define 

 the family Psychopsidce afresh, and to deal more fully with the 

 Australian genera and species. This will necessitate a discussion 

 of the validity of the genera proposed by Navas for the Austra- 

 lian species, a re-grouping of the species, and descriptions of two 

 new genera and species. 



Family PSYCHOPSID^. 



Head: size small or medium; eyes large and rounded, well 

 separated, projecting laterally ; ucelli absent or vestigial ; 

 antenncB short, set fairly close together, many-jointed. Mandihles 

 small, with only a single internal tooth below apex; ma.vilke with 

 five-jointed palpi; labial palpi three-jointed. 



Thorax: broad and strongly built; ])7'olho7'ax short and com- 

 paratively narrow; mesothorax very broad and large; metathorax 

 also broad, much shorter than mesothoi-ax, and not fused with 

 it. Legs short, the tibiae with a pair of terminal spurs, the tarsi 

 five-jointed, with small terminal claws and a broad empodium. 



Wings very broad, with broadly rounded apices. Costal 

 space excessively widened from base to apex without any dif- 

 ferentiated pterostigma; the costal veinlets numerous and fre- 

 quently branched, generally connected by a more or less complete 

 series of longitudinal cross-veins (absent or reduced in the smaller 

 species); a recurrent vein at the base of the costal space. 8c, R, 

 and Rs are strong veins, and run closely parallel, forming a strong- 

 midrib to the wing, the cena tripHca, supported by numerous 

 cross-veins; this formation ends at a point between one-quarter 



