64 Arthur M. Lea : 



each side of the middle, prothnrax with iiiedio-hasal fovea smaller, 

 elytra without impunctate spots, and the teeth of the hind coxae even 

 larger and somewhat curved. 



The females of the two species are much alike, but when placed side 

 by side certain differences of degree (as in size of prothoracic fovea and 

 width of head) can be noted ; although these are of such a nature 

 that it would be inadvisable to identify a specimen as either excavi- 

 pectus or Griffithl from the female alone, although the nudes are 

 readily distinguishable by the metasternum. 



*Arfirerus nitidicoll is, Raft'r. 



Mr. Davey has taken two males that belong to this sjiecies ; they 

 agree perfectly with the description, except that the antennae are not 

 twice the length of the head, but in this resipect they agree with the 

 figure accompanying the description. The species differs from con- 

 strictiventris in having the jtrothorax much more polished, with a 

 shallow transverse subbasal impression suddenly deepened at its 

 middle. The excavation on the upper surface of abdomen is trans- 

 versely suboblong, and with the constricted parts of its walls less 

 triangularly encroaching. 



Hah. — Victoria : Portland, in a nest of Ii idoniijniicr rufoniyer. 



*Artictrus Masttrsi, Lea. 



There is a specimen of this species in King's collection (now in 

 the Australian Museum) standing under the name of aiigustico/lis ; 

 it differs, however, from the description and figure of that species in 

 being considerably suuiller, the prothorax decidedly transverse (in the 

 figure of that species the prothorax is drawn as longer than wide), 

 the antennae shorter and stouter, and the abdominal excavation 

 totally different. 



Mr. Davey has recently taken specimens in nests of Iiidomyrintx 

 yraciUs at Ararat, and Mr. T. S. Hall sent me another that was taken 

 at Castlemaine, and mounted in Canada balsam many years ago. Mr. 

 H. II. D. (irithth also has recently taken sexes of the species at Ade- 

 laide. 



The male differs from the feujalc in having a spine marking the 

 ajiex of a ridge on the front of the prosti'rnum, its metasternuui is 

 terminated by an oblique acute spine, tlie under surface of the ab- 

 domen is excavated. The front trochanters are spinose, all the tibiae 

 are inflated at apex, the front pair terminated by a small spine, and 

 the middle pair by a curved hook ; the hook and the tarsus combined 

 from some directions appear like a small claw. 



