S20 DIPTERA OF NORTH AMERICA. [PART IV. 



very faint shade on the marginal cross-vein ; otherwise the wing 

 is unicolorous ; auxiliary and first longitudinal veins reddish ; the 

 other veins brown; praefurca of moderate length, straight, except 

 at the basis ; petiole of the first submarginal cell about half the 

 length of the praefurca, distinctly longer than the great cross- 

 vein, gently arcuated ; marginal cross-vein somewhat nearer to 

 the inner end of the first submarginal cell than to the tip of the 

 first longitudinal vein ; branches of the second longitudinal vein, 

 especially the posterior one, arcuated ; second submarginal cell 

 longer than the first posterior by a distance which is a little 

 shorter than the great cross-vein ; seventh longitudinal vein 

 curved at the tip. 



Hab. Massachusetts (Mr. Packard) ; a single male specimen. 



This species is very like L. luteipennis in its general appearance, 

 but is easily distinguished by its unicolorous wings ; the thorax, 

 although brownish above, has not the distinct brown line in the 

 middle, which is very striking in luteipennis ; the size is some- 

 what larger ; the feet are considerably longer ; in L. luteipennis, 

 the fore tarsi of the male are about 0.22 long, in L. inornata 

 about 0.32 ; the head of the latter species is of a purer gray, the 

 pleurae more bluish-gray ; the second submarginal cell is a little 

 shorter. The only specimen in my possession has the second 

 posterior cell much longer than its petiole, and the great cross- 

 vein very near the inner end of the discal cell. The impressions 

 on the humeri and the double dot in front of the mesonotum are 

 very distinctly marked, black, shining. 



16. Li. fratria, n. sp. % . — Fuscana, thorace cinereo, mesonoto pallide 

 infuscato ; antennarum fiagelli articulis usque ad apicem brevibus ; alis 

 unicoloribus, subhyalinis, parum fuscano tinctis ; cellula submargi- 

 nalis secunda posteriori prima modice longior. 



Brownish, thorax yellowish-gray, mesonotum somewhat brownish ; joints 

 of the flagellum short to the very apex ; wings unicolorous, subhyaline, 

 very faintly tinged with brownish ; second submarginal cell moderately 

 longer than the first posterior. Long. corp. 0.3. 



Head yellowish-gray, with blackish hairs; rostrum and palpi 

 brown ; antennas pale brownish ; first joint cylindrical ; the second 

 rather large, rounded ; all the joints of the flagellum are not much 

 longer than broad, rounded, gradually diminishing in size towards 

 the tip (not at all linear, like those of L. luteipennis and inor- 



