NEW MUSCOID FUES FROM THE ANDEAN MONTANYA 127 



Reproducrive habit, probably leaf-larviposition of colored maggots. 



Type, Uruhuasia cruciata, new species. 



This genus may be edlied to G^mnomma. It differs from Brauer and 

 von Bergenstamm's brief description of G. nitidiventris in having discal 

 macrochaetae. Its other points of difference may be found in the de- 

 scription. 



Uruhuasia cruciata, new^ species. 



Length of body, 9 mm. ; of vsang, 8.5 mm. One male, Uruhuasi 

 Bridge, San Gaban Canyon, about 6,500 feet, February 3, 1910, on 

 flow^ers of Baccharis sp. 



Head deep bright golden throughout, the parafrontals only slightly 

 darkened, the frontalia and first two antennal joints deep rust-yellow ; 

 third antennal joint and arista black except that base of former is tinged 

 with the rust-yellow. All the pile of head except the frontal hairs is of 

 the same bright gold shade. Thorax and scutellum black but covered 

 with an olive-gold pollen producing nearly same shade of color as that of 

 parafrontals ; the scutellum only thinly pollinose on apex where it appecirs 

 more blackish. Four narrow thoracic vittae. Abdomen wholly soft 

 black, slightly reddish on sides of first two segments ; a very thin silvery 

 pollen covering the dorsum of second to anal segments, that of third and 

 anal segments more noticeable and occupying the front hcJf or so of seg- 

 ment except on median line, thus leaving a soft black cross formed by 

 the broad median line and the posterior half of third segment. The sil- 

 very necurly reaches hind margin of anal segment at sides. Legs wholly 

 deep rust-yellow, the front femora golden pollinose. Wings lightly infus- 

 cate, the basocostal area broadly bright rust-yellow and the front scale of 

 tegulae same color ; hind scale of tegulae smoky like wings, except the 

 narrow margin and extreme base rust-yellow. 



This species approaches the coloration and habitus of Eusignosoma 

 nigrum. 



Subgenus A. — Characters already given above for U. cruciata T., 

 which is type. 



Subgenus B. — Differs as follows, description being of male: Macro- 

 chaetae of anaJ abdominal segment covering more than posterior half of 

 dorsum. Scutellum with two lateral marginal macrochaetae of ordinary 

 form ; apical pair of weak divaricate bristles, almost hairlike ; submarginjJ 

 row of slender but straight subspinelike macrochaetae, the outer one being 



