Miller. — The Dipt era Fauna of New Zealand. 



293 



'Pleurae altogether yellow ; apex of wing clouded ; abdomen of $ 



somewhat spatulate, being narrowed towards base (fig. 13) 

 - Pleurae partially yellow or without markings ; apex of wing not 



clouded ; abdomen of s not spatulate, the sides parallel or 



restricted in middle 

 Face yellow or grey with black markings ; abdominal spots 



linear if present 

 Face black ; abdominal spots broad or clavate 

 Abdomen broad and ovate ; face vertical, produced only at 



oral margin (fig. 7) ; 3rd antennal joint elongate (fig. 6) 



posterior femora broad and bristly beneath ; eyes haired . 

 Abdomen narrow or rectangular ; face not vertical to oral 

 \ margin but with a distinct knob in middle ; eyes bare 

 (Legs normal 



\ Legs peculiarly haired (fig. 16) ; posterior tibiae and protarsi 

 ( enlarged, or anterior tibiae and tarsi broadened (fig. 45) . 



/Rather robust flies ; head more or less distinctly rectangular 



face vertical or produced slightly forward ; antennae lying 



flat on face (figs. 15, 18, 19, and 20) 

 Rather slender flies ; head not distinctly rectangular ; face 



concave if anything ; antennae not flat on face . . 

 j Vein R4 + 5 deeply looped into cell R s 

 1 Vein R4+5 moderately or slightly looped 



Subfam. Eristalikae. 

 (Cell R x closed .. 

 { Cell Ri open 

 Posterior femora with an extraordinarily large triangular tooth 

 near apex below ; vein M 1 strongly curved to meet R4+5 

 a considerable distance from costa 

 Posterior femora without triangular process, at most with 

 bristly swelling ; vein M x meeting R4+5 on or near costa 

 Eyes hairy 

 Eyes bare . . . . . . . . 



Eyes dichoptic in both sexes ; thorax moderately or indistinctly 



haired ; scutellum normal 

 Eyes of 3 holoptic ; thorax densely haired ; scutellum with a 

 pair of tubercles 



10 

 11 



•I 



Subfam. Meleshnae. 

 /Cross-vein r-m beyond middle of cell 1st M 2 ; thorax striped ; 

 abdomen with hoary spots ; posterior femora moderately 

 14 -( thickened . . 



1 tJ 



Cross- 



y si 



-vein r-m at middle of cell 1st M 2 ; posterior femora 

 strongly thickened . . 

 , _ j Abdomen with yellow spots 

 ( Abdomen immaculate 



Sphaerophoria. 



Syrphus. 

 Melanostoma. 



Lepidomyia. 



7 

 Melanostoma. 



8 



Cheilosia. 



Platycheiriis. 

 10 

 14 



Eristalis. 

 11 



Merodon. 



12 



Myiatropa. 

 13 



Helophilus. 



Mallota. 



Tropidia. 



15 



Syritta. 

 Xylota. 



Subfamily SYRPHINAE. 



Cross-vein r-m distinctly before middle of cell 1st M 2 



cell R t open. 



curved into cell R 5 but more or less straight 



vein R 4 + 5 



not 



Genus Paragus Latreille (1805). 



The outstanding character of this genus is the arched face ; the eyes of 

 the male are holoptic, those of the female dichoptic. 



P. pseudo-ropalus n. sp. (Plate LI I, fig. 1 ) 



A medium-sized fly with yellow face and scutellum, a pair of yellow 

 spots on the 2nd and 5th, and a broad yellow band on the 3rd and 4th 

 abdominal segments (fig. 12). This species is named pesudo-ropalns owing 

 to its superficial resemblance to Syrphus ropalus Walk. ; the two species may 

 be distinguished by the shape of the face, which is arched in the former 

 (fig. 5) and vertical in the latter (compare also figs. .12 and 37). 



