DIPTERA . 25 



The second segment of the abdomen is without discal macrochaetae, the third and 

 fourth possess both discal and marginal. The wings are distinctly brownish tinged. 

 The body throughout is much barer, owing to the extreme shortness of the finer hairs 

 which are abundant and conspicuous in the male. 



Plate II. figs. 15, side view of head, and 16, chaetotaxy of thorax. 



(2) Prosthctochacta lucilioides, sp. nov. 



J %. Long. 6 — 7 mm.; al. 6^ — 7 mm. Face and frons blackish, with silvery 

 tomentum, oral margin and vibrissal angle reddish-yellow, antennae blackish-brown, 

 palpi reddish-yellow, occiput with black setae above and fine yellowish hairs below. 

 Thorax bright metallic green, somewhat pollinose in front, scutellum green, abdomen 

 bright metallic green with the first segment almost entirely and the base of the second 

 at the sides light yellow, genitalia of t prominent, brownish-yellow. In the t the 

 second and third segments have each two discal and five or six marginal macrochaetae, 

 in the % only fine marginal bristles are present. Legs with the fore coxae and femora 

 light yellow, the latter darker at the tip, with fine pubescence within and three rows 

 of long, regularly disposed bristles on the outer side, intermediate and hind coxae 

 greyish-green, femora yellow with dark tips, all the tibiae dark brown and the tarsi 

 black. Wings distinctly tinged with yellowish-brown, alulae yellowish. 



Hab. Hawaii, Olaa, July 1895, O'^^ male ; Kilauea, one female, September 1S95. 



Plate II. fig. 17, chaetotaxy of thorax. 



(3) Prosthetochaeta obscitra, sp. nov. 



?. Long. 6^ mm.; al. 7 mm. Similar to P. Incilioides, hut wertQ-s. tinged with 

 dull metallic green, vibrissal angle dark, palpi dark brown, tomentum on face obscure 

 yellowish rather than silvery. Thorax and abdomen duller green, the latter obscurely 

 yellowish at the extreme base. Legs with fore coxae brownish-yellow and fore femora 

 dark brown with a metallic green tinge, otherwise as in P. lucilioides. Wings quite 

 clear. 



Hab. Hawaii, Kona, 4000 ft., September 1892, one female. 



(4) Prosthetocliacta fasciata, sp. nov. 



^. Long. 5^ — 6^ mm. ; al. 5 — 6 mm. Metallic green, more or less covered with 

 white tomentum, segments of abdomen narrowly edged behind with purplish black. 

 Palpi and halteres yellow. Legs dark, the femora tinged with metallic green. 



This species appears to be variable, but it may easily be recognized by the narrow 



F. H. III. 4 



