24 FAUNA HAWAIIENSIS 



(6) Dyscritomyia, sp. 



A male specimen from Haleakala, Maui (8000 ft., April 1894) appears to be quite 

 distinct from any of the above species. As it is in bad condition, however, it is better 

 to defer the description of such a form until better material is obtained. It appears to 

 be characterised by a very broad silvery front and face, clear wings with the basal half 

 of the costa infuscated, while the macrochaetae and soft hairs over the whole surface of 

 the body appear to be of unusual length. 



Prosthetoch.-\eta, gen. nov. 



Allied to Dyscritomyia, but body stouter, eyes of t much closer together, almost 

 touching, chin not highly polished, antennae with arista plumose much nearer to the tip. 

 Thorax with three humeral bristles, two post-humeral, two or three dorso-central before 

 the suture and three behind, four pairs of acrostichal, of which two are before the suture 

 and two behind, two intra-alar, three supra-alar, and one pre-sutural, which lies higher 

 than the second post-humeral. Abdomen in the ^ with both discal and marginal macro- 

 chaetae on the second and third segments, the genitalia prominent. 



Type of genus : P. robiisia. sp. nov. 



(i) Prosthetochaeta robusta, sp. nov. 



i. Long. Corp. 11 mm.; al. 10 mm. Bright metallic green, with a coppery tinge, 

 thorax very slightly plumose. Antennae, palpi and proboscis blackish-brown, face and 

 frons blackish, with silvery tomentum, oral margin distinctly yellowish, chin somewhat 

 shining, transversely wrinkled, covered with fine black hairs on the surface and a row of 

 strong bristles below, occiput with black setae above and long, fine, yellowish hairs in 

 its lower part. First segment of abdomen with two discal and two central marginal 

 macrochaetae, third segment with two discal and a row of about a dozen marginal macro- 

 chaetae, fourth segment thickly covered with bristles and long hairs. Wings clear, 

 alulae fuscous, edged with yellowish-white, halteres with brownish stem and yellow club. 

 Legs black, femora with slight metallic tinge and covered with long hairs and bristles, 

 tibiae with scattered bristles, tarsi with very large claws and pulvilli. 



H.\B. Lanai, one male, Koele Mts., above 2000 ft.. July 1S94. 



A female from Kauai (2 — 3000 ft., Jan. — Feb. 1897) may belong to this species. 

 The tomentum on the face is decidedly yellowish, the colour of the thorax and abdomen 

 blackish-green, much less shining, and the former distinctly covered with greyish 

 tomentum. 



