Cameron. — On a New Species of Halictus. 17 



From the above account it will be seen that in the North 

 Island there is only one species of fresh-water crayfish (which 

 may, however, be divided into two or three fairly well marked 

 varieties), while in the South Island there are three species. 



Art. VI. — Description of a Neiv Species of Halictus (Andre- 

 nidse) from Christchurch, Neio Zealand. 



By P. Cameron. 



Communicated by Captain Hutton. 



[Read before the Philosophical Institute of Canterbury, 6th September, 



1899.] 



Two species of Halictus have been recorded from New Zea- 

 land. These may be separated from the species here described 

 as follows : — 



A. Base of median segment bearing radiating striae. 



Mandibles ferruginous ; legs dark testaceous ; 

 abdomen fuscous ; alar nervures ferru- 

 ginous . . . . . . . . sordidus, Smith. 



Mandibles bright-yellow, black at base and 

 apex ; legs black ; the knees and the 

 greater part of the tarsi yellow ; alar 

 nervures fuscous .. .. .. htittoni, u. sp. 



B. Base of abdomen finely rugose. 



Mandibles black, rufo-testaceous at the 



apex; legs black .. .. .. familiaris, Smith. 



Halictus huttoni, sp. nov. 



Niger, capite thoracique dense argenteo pilosis ; apice clypei, 

 labro, medio mandibularum late, geniculis basique tar- 

 sorum late, flavis ; alis hyalinis, nervis nigro-fuscis. <? . 

 Long. 5 mm. 



The basal three joints of the antennae black ; the rest 

 brown, black above ; the scape sparsely covered with long 

 white hair ; the fiagellum with a close white down. Head 

 black ; the front duller in colour ; the apex of the clypeus 

 broadly, the labrum and the mandibles broadly in the middle, 

 bright-yellow. The vertex has a slight greenish tinge, is more 

 shining than the front, and is closely and finely punctured ; 

 the ocellar region smooth and shining ; the front is opaque, 

 alutaceous ; both parts are thickly covered with long fuscous 

 hair ; the lower orbits, the clypeus, and labrum are thickly 

 covered with long silvery pubescence. Thorax entirely black ; 

 the mesonotum shining, finely and closely punctured ; a broad, 

 2 



