LEI A. 27 



Corpus sat latum, sublineare, nonnunquam niteus. Ocelli tres, distincti. 

 Oculi ovati. Palpi 4-articuIati. Antemifc filiformes, 16-articulatae, 

 corporis diinidio non longiores ; vena subcostalis brevis, subapicalis 

 furcata, subaualis Scepissime furcata. Abdomen depressum, non com- 

 pressum, tliorace duplo longius. Pedes mediocriter longi ; tibiae pos- 

 ticoa spinosce. 



Body moderately broad, nearly linear. Ocelli three, distinct. Eyes 

 oval. Lip broad, somewhat bilobed. Palpi four-jointed ; first joint 

 globose ; third elongate-clavate ; fourth much longer, filiform. An- 

 tenna; sixteen-joiuted, filiform, not more than half the length of the 

 body. Thorax shining in some species. "Wings rather narrow ; sub- 

 costal vein slender, more or less short, joining the costal ; radial end- 

 ing before two-thirds of the length, united near its tip with the costal 

 by a very short transverse veinlet; costal ending at a little in front of 

 the tip ; subapical and subanal forked, the latter simple in one species ; 

 anal distinct. Halteres rather short. Abdomen depressed, not com- 

 pressed, about twice the length of the thorax. Legs of moderate 

 length ; tibia? spurred, more or less spinose. 



The habits of this genus are nearly similar to those of Mi/ceto- 

 fjhlla, from which it may easily be distinguished by the shape of 

 the abdomen. The species may be thus grouped : — 



a. Subanal vein forked. 



b. TibicG with stout spines. Species 1-G. 

 b b. Tibia} with short slender spines. 

 c. Wings spotted. Species 7-8. 

 c c. Wings not spotted. 



d. Face of the male with a spine. Species 9. 

 d d. Face unarmed. 



e. Subapical and subanal veins strongly marked. 

 /. Autennai incrassated. Species 12, 13. 

 //. Antenua3 not incrassated. Species 10, 11, 14. 

 e e. Subapical and subanal veins slight. Species 1.5, 16. 

 a a. Subanal vein simple. Species 17. 



1. fascipennis, Meg.; Meig. Zw. i. 255. 5 (1818); Mcq.; Zctt.; 

 Sta;g. ; Es. — fasciola, Meig. ; Rs. ; Zett. — Jlavicornis, Meig. — co7iso- 

 brina. Curt. — crncifjera, Zett. I. L. Lulea, antennis fuscis, alis sub- 

 testaceis fascia subapicali cinerea, tarsis fuscescentibus. Long. 2-25-; 

 alar. 4-41 lin. 



Luteous, testaceous beneath. Antenna; bi'own, testaceous towards 

 the base. Wings slightly testaceous, ^citli a (jrey subapical band ; sub^ 

 costal vein rather short, united at some distance from its top to the 

 cubital by a transverse veinlet ; radial united with the cubital at some 

 little distance from its tip ; fork of the subanal vein much nearer 

 than the base of the subapical to the base of the wing. Tarsi 

 brownish. 



