67 



APPENDIX. 



THYNNUS MELLEUS. 



Female. Length 4 lines. The head black, smooth, and shi- 

 ning; the antennae, mandibles, thorax, and abdomen beneath 

 rufo-testaceous, the legs ferruginous. The thorax black and 

 shining above, with a few scattered fine punctures ; the anterior 

 margin transverse. Abdomen obscure rufo-fuscous above, the 

 first segment with a few coarse punctures, the second with two 

 transverse grooves, the third, fourth, and fifth segments with 

 their apical margins punctured. 



Hob. Adelaide. 



The male of this species is described in Westwood's ' Arcana 

 Entomologica ' (see ante p. 24). 



THYNNUS VARIPES. 



Male. Length 10 lines. Black : the head and thorax densely 

 clothed with cinereous pubescence, that on the disk of the latter 

 tinged with yellow. The clypeus and mandibles yellow, the tips 

 of the latter rufo-piceous ; the clypeus produced and truncate at 

 the apex. The tibiae and tarsi sometimes ferruginous, with the 

 apical joints of the tarsi fuscous ; the pubescence on the thorax 

 beneath and on the metathorax of a silvery brightness ; wings 

 hyaline, the anterior pair slightly coloured, their extreme base 

 fuscous, the nervures black. Abdomen conical, the base trun- 

 cate, the four basal segments with a transverse yellow band, 

 which is slightly interrupted in the middle, and more widely so 

 on each side ; in some examples the bands are not interrupted 

 in the middle, and only emarginate posteriorly at the sides ; 

 beneath, the abdomen is entirely black and shining. 



Hab. Adelaide. 



Note. Only two specimens have been received, which exhibit 

 the differences described ; probably intermediate varieties occur. 



