100 MUSCIDJ5. 



Genus I. TRIXA. 



TRIXA, Meig. Zw. 222 (1824) ; Mcq. ; Zett. ; Westw. Crameria, Desv. 



Corpus pubescens, setosum. Frontalia striata. Epistoma non promi- 

 nens. Palpi subclavati. Antennae brevissimee; articulus tertius sub- 

 ovatus, secundo plus duplo longior j sextus subpubescens. Abdo- 

 men subovatum. 



Body bristly. Frontalia striated, slightly widening in front, with a 

 double" row of bristles on each side ; face with very shallow furrows ; 

 facialia bristly along full half the length ; epistoma not prominent ; eyes 

 bare ; palpi subclavate. Antennae not near reaching the epistoma ; third 

 joint subovate, more than twice the length of the second ; fourth and 

 fifth very short ; sixth very minutely pubescent, more than twice the 

 length of the third. Abdomen subovate. 

 a. Femora black. Species 1, 2. 

 a a. Femora tawny. Species 3. 



1. variegata, Meig. Zw. iv. 225. 6 (1824) ; Mcq. Nigra, albo- 

 tomentosa, frontalibus ferrugineis, facialibus rufis, palpis fulvis, anten- 

 nis obscure rufis, thorace sexvittato, alis subcinereis, abdomine nigro 

 tessellato, tibiis tarsisque ferrugineis. Long. 5 ; alar. 11 lin. 



Black, with white shining tomentum. Frontalia dark ferruginous ; 

 facialia red ; palpi tawny. Antennae red ; sixth joint black. Thorax 

 with six black stripes. Wings slightly grey ; veins black, partly tawny 

 at the base ; transverse veins clouded with brown ; costal vein ending 

 at a little in front of the tip of the wing ; subcostal vein ending at one- 

 third of the length ; mediastinal vein ending at half the length ; radial 

 vein ending at about four-fifths of the length ; cubital vein ending very- 

 near the tip of the costal ; praebrachial vein emitting a short branch, 

 and forming a hardly obtuse angle at its flexure, near which it is slightly 

 curved inward, and thence is almost straight to its tip ; discal transverse 

 vein with two curves, the hind one much deeper than the other, parted 

 from the flexure of the prasbrachial by a little more than half its length, 

 and by much more from the border. Alulae white. Halteres tawny. 

 Abdomen black, tessellated. Legs ferruginous ; femora black. 



ISTot common. (E.) 



2. dorsalis, Meig. Zw. iv. 225. 5 (1824); Mcq. Nigra, albo- 

 tomentosa, frontalibus tibiis tarsisque ferrugineis, facialibus antennisque 

 rufis, thorace sexvittato, alis subcinereis, abdominis apice lateribusque 

 fulvis. Long. 5 ; alar. 1 1 lin. 



Black, with white shining tomentum. Frontalia ferruginous ; facialia 

 red ; palpi tawny. Antennae red ; sixth joint black ; thorax with six 

 black stripes. Wings slightly grey ; veins black, partly tawny at the 

 base ; transverse veins clouded with brown ; costal vein ending at a 



