700 . FAUNA HAWAIIENSIS 



and behind their middle externally on each side there starts another black stripe 

 reaching to the scutellum, while between them on the posterior half of the mesonotum 

 is a median dark stripe (or perhaps two very closely apposed stripes). Scutellum dark 

 on the disc, but broadly bordered with yellow, metanotum mostly dark ; pleura with 

 three or four dark spots. Halteres yellow. Legs yellowish, tips of tibiae noticeably 

 infuscate. Wings hyaline, their base as far as the apex of the first vein for the most 

 part infuscate, the infuscation irregular in depth and distribution, marginal cell infuscate, 

 as well as the tip of the wing on either side of the apex of the second, third and fourth 

 veins ; transverse veins and a small portion of the fourth longitudinal vein just before 

 the apical one of the two transverse veins that are between it and the third, distinctly 

 infuscate on each side. This second or apical transverse vein oblique, placed much 

 before the posterior transverse, the sector of the fourth vein between these being not 

 much shorter than the first named. Abdominal segments hairy, more or less shining, 

 black medially and apically, so as to leave a well-marked series of yellow spots on each 

 side. Ovipositor reddish yellow. 



Hab. Hawaii. 



(2) Idioviyia silvestris, sp. nov. 



Front golden yellow, the orbits as far as the apical fronto-orbital bristle, the vertical 

 triangle and a band connecting these posteriorly, blackish and with grey tomentum ; 

 face, palpi and proboscis yellow. Antennae dark, the second joint pitchy brown, the 

 arista with about four bristles beneath, the basal jDart being bare, and about nine above. 

 Mesonotum yellowish, most of its surface suffused with brown or blackish infuscation, 

 forming vague lines and spots, but not a definite pattern ; scutellum dark brownish 

 black, metanotum black, tomentose ; mesopleura mostly blackish. Halteres pale 

 yellow. Legs yellowish or brownish yellow with the middle and hind femora dark 

 brown or blackish, the tibiae also more or less dark. Wings hyaline, basally as far as 

 the termination of the first vein largely but irregularly infuscate, marginal cell faintly 

 brownish, tip of wing darkly infuscate on either side of veins two, three and four. 

 Transverse veins infuscate, as also the part of vein four just before the origin of the 

 second or apical of the two transverse veins between it and the third. This second 

 transverse vein is oblique and placed much before the posterior cross-vein, so that the 

 sector of the fourth that lies between them is not much shorter than this second 

 transverse vein itself. Abdomen black, at the base a little pale, pilose and shining, the 

 ovipositor paler. 



Hab. Hawaii. 



