200 INSECUTOR INSCITI^ MENSTRUUS 



brown, sparsely pruinose. Pleura brownish gray with a narrow, 

 velvety black longitudinal stripe beginning behind the fore 

 coxa ; posterior pleurites blackened ; velvety-black areas on the 

 ventral portions of the mesosternum between the fore and 

 middle legs. Halteres rather long, brown, the base of the stem 

 and the knobs conspicuously yellow. Legs with the coxae 

 brown, the fore coxae darker brown ; trochanters obscure yel- 

 lowish testaceous, remainder of the legs broken. Wings tinged 

 with gray, the center of the disk more nearly hyaline ; stigma 

 oval, brown ; conspicuous brown clouds at origin of Rs, along 

 the cord and outer end of cell ist Mo ; inner ends of cells 

 R and M infuscated, preceded by a conspicuous white oblit- 

 erative area at arculus ; veins brown. Venation : Sc long, Sc^ 

 extending almost to the end of Rs, Sco at its tip ; Rs strongly 

 angulated to almost square at origin, feebly spurred; tip of R^ 

 atrophied, the end of the vein being a short distance beyond r; 

 a supernumerary crossvein (the apparent tip of R.^) present; 

 cell 1st M^ long, nearly as long as vein -M^+g beyond it; basal 

 deflection of Cu^ immediately beyond the fork of M. 



Abdomen dark brown, the hypopygium a little paler. 



Habitat. — New Zealand (North Island). 



Holotype, male. Ohakune. altitude 2,060 feet. April 10, 1922 

 (T. R. Harris). 



Molophilus tridentata, new species. 



Male. — Length about 2.3 mm. ; wing 2.8 mm. 



Related to M. gonrlayi Alexander, dilTering as follows : The 

 antennae are shorter, the individual flagellar segments not ex- 

 tended into a long, shiny apical portion, this part of each seg- 

 ment being short and inconspicuous ; the bead-like appearance 

 of the antennae of M. gourlayi is thus largely obliterated. The 

 pleurites are darker colored. R.,+„ is a little longer. The 

 structure of the male hypopygium ofl:'ers the most valuable 

 characters for the separation of the two, these being as follows : 

 Pleural appendages more elongate, slender, tapering rapidly to 

 the subacute apex, the appendage without distinct spinulae as 

 in gourlayi. The fused gonapophyses terminate in three sub- 



