104 Dr. C. P. Alexander on 



hypopygium with a single pleural appendage — this flattened, 

 ear-shaped, and terminal in position. 



Male. — Length about 2*6 mm.; wing 3*2 mm. 



Female. — Length about 3 mm. ; wing 3'3 mm. 



Rostrum and palpi pale brown. Antennae with the first 

 segment pale brown, the second segment darker ; flagellum 

 broken. Head dark brown. 



Pronotum dark brown. Mesonotum dark brown, the 

 humeral region brighter. Pleura dark brown. Halteres 

 dark brown, the extreme base obscure yellow. Legs with 

 the coxae and trochanters obscure yellow; remainder of the 

 legs black ; only the middle legs remain, and these show 

 faint indications of narrow pale rings on the tibiae and tarsi, 

 possibly due to the removal of trichiae. Wings tinged with 

 brown, the veins a little darker and clothed with long, dark 

 brown macrotrichiae. Venation : vein 2nd A short, ending 

 some distance before the level of the fork of Cu. 



Abdomen dark brown, Male hypopygium with the 

 pleurites short and stout ; a single pleural appendage—this 

 terminal in position, flattened, ear-shaped, pale yellow in 

 colour. Penis-guard and apophyses forming a chitinized 

 mass between the pleurites, the guard jutting caudad as two 

 slender parallel points. 



Hab. New Zealand (North Island). 



Holotype^ ^ , Ohakune, altitude 2060 feet, January 18, 

 1922 {T. R. Harris). 



Allotopotypey ? . 



Molophilus paululus is related to M. gourlayi^ Alex. 



Rhabdomastix {Sacandaga) optata, sp. n. 



General coloration grey, the praescutum with two sub- 

 median brown stripes ; pleura dark grey ; wings whitish 

 subhyaline, handsomely variegated with brown, the costal 

 region more yellowish ; abdominal segments pale brown, 

 the bases of the segments darker brown. 



Male. — Length about 4'8 mm. ; wing 6 mm. 



Female. — Length 6*8 mm. ; wing 7*2 mm. 



Rostrum and palpi dark brown. Antennae dark brown 

 throughout, the flagellar segments with an abundant, erect, 

 white pubescence. Head grey. 



Mesonotum dull grey, the praescutum with two submedian 

 brown stripes ; in the female, the lateral stripes are also 

 indicated. Pleura dark grey. Halteres pale. Legs with 

 the fore coxae dark, the other coxae obscure brownish 



