NEW AUSTRALIAN SAW FLIES. 
‘221 
Thorax. — Mesonotum in front of a transverse line reaching from tegula 
to tegula is rough, dull, densely and finely punctured and covered with close 
fine pubescence ; rest of thorax is smooth shining with scattered coarse rounded 
punctures and sparsely haired ; scutellum flat, broader than long, with front 
margin broadly rounded, hind margin swollen a little in the middle, and with 
sharp slightly produced corners. Wing venation normal with the 3rd transverse 
cubital vein strongly bent in the middle as in Perga dorsalis Leach (see Morice 
1919, plate xv, fig. 14). Hind legs with tarsal segments together much shorter 
than tibia. 
Abdomen with almost obsolete fine rugulose sculpturing, the surface being 
smooth and polished. 
New South Wales, Tooloom, 1$, 12-ii-1922 (H. Hacker). 
This very fine new species I dedicate to the great Swedish entomologist 
C. G. Thomson ; this is to continue the policy of Westwood in naming 
species of Perga after Hymenopterists. Perga thomsoni sp. nov. would run down 
in Morice’s key to couplet 16 where it will not fit owing to its entirely black 
thorax. It appears to be closest in structure to P. christi Westwood* but the 
temples are more heavily punctured and the scutellum has definitely angular 
projections at the hind corners, while in P. christi Westwood the projections 
are rounded. Unfortunately the unique specimen on which the species is based 
had its abdomen so badly eaten out by Anthrenus that the saw was missing. 
Morice 1919, p. 265, gave the descriptions of two Perga spp. which he 
could not fit into his key as they had their antennae missing. In the Queensland 
collection are representatives of both these species, both having exceptionally 
short yellow antennae, so that P. walJceri Westwood comes very close to 
P. mayrii Westwood and P. christi Westwood as suggested by Morice comes very 
close to P. dalbohmi Westwood and P. vacillans Morice. Both P.. ivallceri 
Westwood and P. christi Westwood were recorded from South West Australia 
by Westwood 1880, p. 368 and 366. In the Queensland Museum collection 
P. christi Westwood is represented by 1 $, Queensland, Bunya Mountains, 
9-xii-1925 and P. walkeri Westwood by 1 <j>, Queensland, Brisbane, Mount Cootha, 
20-M925, H. Hacker, and 2$$, North Queensland, Ayr, 30-X-1925, S. Bates. 
Either here we have an extraordinary case of distribution or else, what 
seems more probable, there was some error in the localities recorded by 
Westwood. 
XYLOPERGA PERKINSI sp. nov. 
? Colour yellow ; black are the tips of the antennae, an ocellar patch, the 
shortest middle part of the pronotum, the meso- and meta-notum (except the 
scutellum and the sides of the mesonotal lobes reaching from front angles of the 
c 
