636 



Trans actions. — Zoology. 



genus Strumigenys, and will henceforth be named S. perplexa; 

 S. antarctica, Forel, being a synonym of it. 



I describe here a new species belonging to the genus Disco- 

 thyrea, which was established by Roger in 1863 for one species 

 from North America. The occurrence of this genus in New 

 Zealand is a further evidence of the cosmopolitanism and great 

 antiquity of most genera of Ponerinse. 



Discothyrea antarctica, n. sp. 



$ . Testacea, subtilissime punctata et tenuissime pubes- 

 cens, pilis erectis omnino destituta, thorace superne convexo, 

 haud marginato, metanoti pagina declivi subplana, marginata, 

 superne minute, obtuse bidentata. Long., 2mm. 



Found on Hunua Eange, January 26, 1891, by Captain 

 Broun, and sent by Mr. W. W. Smith. Three specimens. 



The New Zealand species differs from the North American 

 mainly by the laterally non-marginated thorax and the greater 

 size. Roger's description is too incomplete to allow further 

 comparison. I give an outline of the insect viewed from the 

 side. 



In respect to the generic characters, if we compare Disco- 

 thyrea with the allied genus Proceratium, we must admit that 

 the clypeus is reduced to form only the sharp edge of the disk- 

 like produced forehead, the part which in other genera^ is 

 wedged between the laminae frontales being totally atrophied 

 and the latter coalesced. The mandibles are triangular, with 

 a concave, toothless inner edge terminated by a sharp. point. 



