12 



FAUNA HAWAIIENSIS 



As Thomson only described the male, a short account of the other sex is here 

 appended : ?. Like the male, but lighter green, the abdomen generally with a coppery 

 tinge. Arista of the antenna without the enlargement at the tip, halteres light with 

 orange-coloured knob, legs much paler, femora entirely bright yellow, front tibiae with 

 the three outer bristles longer, and also provided with two long bristles on the inner 

 surface, intermediate tibiae with three or four bristles on the inner and outer sides, hind 

 tibiae simple, with three long bristles on the outer side only, tarsi dark, wings with the 

 posterior transverse vein much less bent, in some specimens almost straight. 



This species appears to be very closely allied to G. {Psilopns) globifer Wied., but 

 differs from that species by the fact that the fore tibiae are slightly longer than the 

 metatarsi, the latter not being broad and compressed, while the wings are quite 

 clear (compare Schiner's description in Reise d. Novara, Dipt. pp. 215 — 216). 



Plate I. figs. 17 — 19, ^ genitalia, wing, leg of Z- 



(2) Gnaviptopsilopiis paUidicornis, sp. nov. 



Z- Long. Corp. 5 mm. ; al. 5 mm. Front and face metallic green, dusted with 

 white tomentum, the former deeply excavated, clypeus snow-white, proboscis and palpi 

 light yellow. Antennae with all the joints light yellow, arista apical, dark brown, about 

 as long as the abdomen. Thorax bright metallic green, dusted in front with greyish- 

 white tomentum, scutellum bluish-green, with two bristles, halteres light yellow. 

 Abdomen very slender and laterally compressed, with first segment metallic green, 

 second segment metallic green with the base and sides yellow, third yellow with a 

 triangular green spot at posterior margin, fourth yellow with green posterior margin, 

 fifth and sixth entirely metallic green with a coppery tinge, hypopygium with two slender 

 light yellow filaments. Legs, including the coxae, entirely light yellow, tips of the tarsi 

 a little darker, front pair with three whitish bristles on the coxae, otherwise without 

 bristles, intermediate pair with about three weak ones on the under side of the femora 

 and two on the outer side of the tibiae, viz. one about the middle and a minute one near 

 the base, hind pair with two rows of minute bristles regularly disposed. Wings hyaline, 

 slightly clouded near the tips of the 2nd and 3rd longitudinal veins, both of which are 

 bent back towards the 4th, branch of the latter making a right angle at its origin, 

 posterior cross-vein oblique, two-thirds of its length from the margin. 



Hab. Oahu, one male, Honolulu, November 1896. 



This species appears to be closely allied to G. flavicornis Aldrich (Tr. Ent. Soc. 

 1896, p. 342), described from the island of St Vincent. It is however much larger, and 

 the arista of the antennae is apical. 



Plate I. figs. 20 and 21, ^ genitalia, wing. 



