Mr. I{. E. Turner on Fossorial nijmenoptera. 71) 



deep longitudiual sulcus, the rest of the segment coarsely 

 and irregularly striated. Abdomen closely and minutely 

 punctured ; the first segment narrowed to the base and 

 somewhat constricted at the apex, not quite half as broad at 

 the apex as the second segment ; third, fourth, and fifth 

 segments clothed with fine yellowish hairs ; pygidial area in 

 the form of a slightly elongate triangle, shining and sparsely 

 punctured. Fore tarsi rather feebly ciliated, hind tibiae 

 smooth, pulvilli small. Second abscissa of the radius about 

 one-third of the length of the third; first transverse cubital 

 nervure sharply bent outwards near the cubitus, but not 

 emitting a scar or nervure inwards ; cubitus of hind wing 

 separated from the transverse median nervure by a distance 

 equal to about half the length of that nervure. 



Hub. S.E. Australia. 



This is near the mystaceus group in most characters, but 

 diflers in the form of the first abdominal segment and of the 

 second ventral segment, which is not angular at the base. 

 In these characters it also departs further from the group 

 than rubrosignatus , to which in most structural points it is 

 closely allied. A. rufomixtus, Turn., is nearest to this 

 species, but differs in the form of the first abdominal 

 segment. 



Arpactus constrictus, Sm. 



Gonjtes constrictus, Sm. Journ. Proc. Linn. Soc. iii. p. 160 (1859). J J . 

 r' Gurytes vagus, Sm. I. c. p. 161 (1859). $. 



Handlirsch considers from the descriptions that these are 

 merely colour- varieties of one species. This is very probably 

 correct, but I have not seen typical constrictus^ which is 

 from Aru. There is a female specimen of vagus from Ke in 

 the British Museum. It belongs to the group stenopygus, 

 Haudl., having the pygidial area very narrow, otherwise 

 agreeing well with the mystaceus group. 



Subfamily Nyssoninm. 



Key to the Australian Species o/Nysson (Acanthostethus). 



6 6. 



1. Seventh dorsal segment with more than 



two apical spines 2, 



Seventh dorsal segment with two apical 

 spines only 7. 



2. Seventh dorsal segment with a row of five 



acute apical spines N. nudiventris, Turn. 



