Miller. — The Diptera Fauna of New Zealand. 319 



margin produced on each side as a tubercle, the dorsal surface densely 

 clothed with a short ferruginous pile and the vertical surface with long and 

 delicate brownish hairs. Pleurae black, clothed with black hairs but bare 

 above the coxae ; a reddish spot in some lights beneath the wings ; anterior 

 and posterior stigmata tawny to orange-red, and protected by a palisade of 

 erect closely-set hairs. Wings clear but blackish-brown at the base ; veins 

 and stigma brown, the cubitus and medius paler basally ; cell K t open ; 

 vein R 4 + 5 deeply curved into cell R 5 ; cross-vein r-m just beyond the 

 middle of cell 1st M 2 ; vena spuria indistinct basally, connected with 

 R 4 + 5 by a distinct cross-vein (absent in some wings) from the nodule; 

 supernumerary vein of cell Cu 2 very distinct and vein-like ; squamae and 

 anti-squamae blackish and translucent, the former fringed with long branched 

 pale hairs, the latter with shorter hairs ; halteres dark brown but reddish 

 along lower edge. Legs blue-black and bristly ; coxae clothed with black 

 hairs ; knees orange-yellow ; underside, apex, and base of tibiae ferruginous 

 or altogether golden ; an orange-yellow area on lower side of posterior 

 tibiae in the middle ; anterior and middle femora with dense black hairs 

 below ; posterior femora (fig. 64) thickened and with a distinct swelling 

 below, along which are distinct bristle-like hairs ; anterior and middle 

 tibiae less bristly than the posterior ; the lighter area on lower side of 

 posterior tibiae bare to the apex ; tarsi orange-yellow to golden with darker 

 reflections, each joint with short rigid bristles at anterior angles ; pulvilli 

 and claws pale tawny, the latter black at the tips ; empodium styliform. 



Abdomen (fig. 65) black, a shiny blue-black area at anterior margin on 

 each side of 3rd and 4th segments, the apical segment shining and greyish 

 in some lights ; broadly ovate, broader than the thorax, clothed with 

 delicate short black bristles, which become dense and stronger along the 

 sides of the 2nd and 3rd segments ; 1st segment and an elongate anterior 

 area on each side of the 2nd segment densely clothed with long silvery 

 hairs ; when vestiture is removed these bearded areas are testaceous or 

 tawny in ground-colour ; a pair of triangular white discal spots and a 

 pair of lateral circular ones on the 3rd and 4th segments and a pair of 

 triangular white spots on the anterior angles of 5th segment as shown in 

 fig. 65 ; from the sides of the 4th segment are long hairs, black except those 

 from the lateral spots which are white ; ventrally the abdomen is sparsely 

 clothed with grey hairs ; the basal sternite greyish and transversely rugose, 

 the remainder blue-black ; a pair of short orange-red styles project from 

 apical segment. 



Fig. 25. — Syrphus hudsoni n. sp. : dorsal view of head of male. 



Fig. 26. — S. hudsoni n. sp. : outline of head in jDrofile. 



Fig. 27. — S. hudsoni n. sp. : part of venation, showing origin of vena spuria, &c. 



Fig. 28. — S. hudsoni n. sp. : diagram of abdomen of male. 



Fig. 29. — S. novae-zealandiae : antenna. 



Fig. 30. — S. novae-zealandiae : outline of head in profile of male. 



Fig. 31. — S. novae-zealandiae : outline of head im profile of female. 



Fig. 32. — S. novae-zealandiae : genitalia of male. 



Fig. 33. — 8. ortas : outline of head in profile. 



Fig. 34. — S. novae-zealandiae : diagram of abdomen of male. 



Fig. 35. — S. novae-zealandiae : diagram of abdomen of female. 



Fig, 36. — S. ortas : diagram of abdomen of female. 



Fig. 37. — S. ropalus : diagram of abdomen of female. 



Fig. 38. — Melanostoma fasciatum : outline of head in prolile. 



Fig. 39. — M . fasciatum : diagram of abdomen of male. 



Fig. 40. — M. fasciatum : diagram of abdomen of female. 



Fig. 41. — M. fasciatum : antenna. 



Fig. 42. — Platycheirus lignudus n. sp. : outline of head in profile. 



