DIPTERA 71 



approach the second, beyond the middle running parallel with the fourth, last section of 

 the latter fully twice as long as the penultimate, transverse vein quite straight. 



Hab. Hawaii, Kona, one female, 4000 ft., August 1892 ; Olaa, one female, 

 July 1895. 



Plate III. fig. 20, head of ?. 



(35) Drosophila obscuricornis, sp. nov. 



^ %. Long. Corp. i^^ mm. ; al. if — 2 mm. Front black with the orbits and 

 vertical triangle shining and a little lighter ; face dark brown or blackish, without distinct 

 keel, proboscis yellowish, palpi dark brown ; antennae entirely blackish-brown. Thora.x 

 blackish-brown, pleurae reddish-yellow (in one of the specimens dark brown), scutellum 

 and metanotum dark brown, the latter shining, halteres yellowish. Abdomen dull 

 uniform blackish-brown, the terminal segment shining. Legs light pitchy-brown. 

 Wings greyish hyaline, no dark spot at the termination of the first vein, terminations of 

 the second and third veins twice as far apart as those of the third and fourth, third and 

 fourth veins parallel, last section of the fourth vein about twice as long as the penultimate, 

 posterior transverse vein straight. 



H.A.B. Molokai Mts., one male and two females, 5000 ft., August and September 

 1893. 



(36) Drosophila varifrons, sp. nov. 



Z- Long. Corp. if mm. ; al. 2^ mm. Front light yellow with the orbits and 

 vertical triangle black and polished ; face, chin, proboscis and palpi light yellow ; 

 antennae entirely reddish-yellow, the arista black with four or five hairs above and about 

 three below. Thora.x shining black, with a slight olivaceous tinge, pleurae, scutellum 

 and metanotum shining black, halteres light yellow. Abdomen black with the last 

 segment highly polished. Legs yellow, the terminal joints of the tarsi darker. Wings 

 hyaline, terminations of the second and third veins twice as far apart as those of the 

 third and fourth, third and fourth veins parallel, last section of the latter about half as 

 long again as the penultimate, posterior transverse vein straight. 



Hab. Oahu, Kaala Mts., on wet rocks, one male, 2000 ft., March 1893. 



{^l"]) Drosophila polita, sp. nov. 



$. Long. Corp. 3^!; mm. ; al. i\ mm. Front shining black behind, reddish-yellow 

 in front ; face yellowish-cinereous, shining ; proboscis yellow, palpi yellow with black 

 tips ; antennae reddish-yellow with the third joint dark brown. Thorax with dorsum, 



