204 Dr. C. P. Alexander on 



variegated with white; bases of anal cells not pale ; obliter- 

 ative areas before the stigma and cord, and beyond the 

 stigma, very small, almost obliterated. 



/fa<5». New Zealand (North Island). ^ 



Holotype, ^ , Ohakune, altitude 2060 feet^ February 16, 

 1922 (T. R. Harris), 



Allotopotype, $ . 



Paratopotypes, 40 J ? , February 9-16, 1922. 



The general appearance of this fly is very different from 

 that of typical albiplagia^ but the structure of the antenna 

 and hypopygium is so similar that it seems best to consider 

 the present fly as a subspecies. 



Macromastix ohakunensis, sp. n. 



General coloration grey, the pr^escutum with four black 

 stripes; antennae short, the scape yellow, the flagellum black ; 

 wings petiolate, tinged with brown ; cell Sc and the stigma 

 darker brown ; cell 2nd A narrow ; abdominal tergites dark 

 brown, segments 1 to 5 obscure yellow sublaterally. 



Female. — Length 7'2 mm. ; wing 10 mm. 



Frontal prolongation of the head elongate, obscure yellow, 

 the ventral surface more infuscated ; palpi dark brown ; 

 nasus elongate. Antennae short ; scape light yellow, 

 flagellum black. Head greyish brown, the orbits broadly 

 ochreous. 



Mesonotal prsescutum grey with four black stripes, the 

 intermediate pair narrowly separated ; scutum brownish 

 testaceous, each lobe with two black areas, the more caudal 

 the larger ; scutellum with the median lobe obscure brownish 

 yellow, the lateral areas blackened; postnotum brownish 

 testaceous, the caudal margin with two large circular black 

 spots. Thoracic setse not conspicuous. Pleura light grey, 

 the dorso- pleural membrane more yellowish. Halteres 

 dark brown, the base of the stem yellow. Legs with the 

 00X86 pruinose, especially the mid-coxae ; trochanters obscure 

 yellow ; femora and tibiae obscure yellow, the tips narrowly 

 dark brown ; tarsi elongate, darkened apically. Wings 

 petiolate, tinged with brown, the stigma and cell Sc dark 

 brown, cell C a little paler ; stigma completely filling cells 

 Sci and 2nd Ri ; veins dark brown. Venation : basal 

 section of R2 short, in alignment with the distal section ; 

 r provided with abundant macrotrichiae ; cell Cui deep ; 

 petiole of cell Mi about two and a half times m ; cell 2nd A 

 very narrow. 



Abdominal tergites dark brown ; segments 1 to 5 broadly 



