20 TENTHREDINIDJS. 



testaceous, like the other pale markings. The cheeks are concolorous, 

 but there is a pale spot at the back of the head behind each eye ; 

 the pale spots on the thorax are less distinct ; and the abdomen is 

 silky green above, with no silky pubescence or red marks, though 

 the first segment is yellowish behind. Undersurface of the abdomen 

 pale, the segments edged with dusky in front. The Australian 

 specimens may be distinct. In the male the grey pubescence of 

 the abdomen is more distinct than in the Tasmanian insect, and the 

 red markings towards the apex much less so. The yellow stripe at 

 the base is entire as in P. dorsalis, and not interrupted as in Tas- 

 manian examples. I have not seen a female from Tasmania. 



Hab. South Australia, Tasmania. 



a.b. 3 , ) ,m * • •) Tasmania. A. Simson, Esq. 



e, d. 6 2 ■ f (Typ68 SFCie8 Victoria. R. Bakewell, Esq. 



3. Perga eucalypti. 



Perga eucalypti, Bennett Sf Scott, Proc. Zool. Soc. 1859, p. 209, 

 pi. lxii. 



Hab. New South Wales*. 



4. Perga schiodtii. 



Perga schiodtei, Westw. P. Z. S. 1880, p. 364, pi. xxxiv. figs. 3, 4. 

 Hab. Australia. 



a. 2 - Moreton Bay. Mr. Diggles. 



b. 2 • Adelaide. 



c. 2 • Adelaide. Mr. Wilson. 



d. 2 • Swan River. Dr. Richardson. 



5. Perga castanea. 

 (Plate I. fig. 6.) 



Exp. al. 1 poll. 9 lin., long. corp. 11 lin. 



Dark reddish brown, almost mahogany-colour, with obscure 

 darker markings on the back of the abdominal segments, having a 

 tendency to form incomplete bands. Antennas and legs straw- 

 colour ; scapulas and mouth yellowish. Thorax thickly and closely 

 punctured, ridged, with a deep median depression in front ; sides of 

 the mesothorax forming a raised ridge grooved in the middle. 

 Underside paler red (chestnut), with a row of pale straw-coloured 

 spots along each side of the abdomen. Wings vitreous, with chest- 

 nut nervures : fore wings with the costa strongly arched beyond 

 the middle ; costal cell and rather large stigma chestnut- coloured ; 



* Prof. Westwood regards this species as synonymous with P. dorsalis ; but 

 it appears to me to represent a different species from any at present contained 

 in the British Museum, but nearer to the following. 



