274 DIPTERA OF NORTH AMERICA. [PART IV. 



specimens would probably disclose some other differences. The 

 picture of the wings is the same. 



Gen. XXXVII. UI.A. 



Two submarginal cells ; four posterior cells ; a discal cell ; the subcostal 

 cross-vein is a considerable distance anterior to the origin of the second 

 vein ; the latter is near the middle of the length of the wing. Whole 

 surface of the wing finely pubescent. Tibise with distinct spurs ; enipodia 

 distinct. Eyes pubescent ; no striking gibbosity on the front ; antennae 

 17-jointed ; first joint unusually short. 



The eyes are remote, being separated on the upper side of the 

 head by a rather broad front ; on the under side they are con- 

 tiguous ; the front, even in fresh specimens, does not show the 

 gibbosity visible in the other genera of Amalopina. Rostrum 

 somewhat prolonged, cylindrical, but shorter than the head ; 

 palpi elongated, slender ; last joint elongated, but not strikingly 

 prolonged. Antennae lt-jointed (I have counted the joints of a 

 fresh specimen of Ula elegans, ? ) ; they are comparatively longer 

 than those of Amalopis and Pedicia, and, if bent backwards, 

 would reach the root of the wings, even in female specimens ; the 

 first joint is remarkably short (the fresh specimen of U. elegans, 9 , 

 observed by me, had this joint shorter than the second, difficult to 

 perceive on account of its smallness) ; the joints of the nagelluni 

 are elongated, subcylindrical, clothed on the under side with a 

 distinct pubescence, more dense in the male, and provided with 

 moderately long verticils. The collare is moderately developed ; 

 thoracic suture well marked ; the depression between it and the 

 scutellum shallow. Feet of moderate length, finely pubescent ; 

 fore tarsi a little longer, hind tarsi a little shorter than the corre- 

 sponding tibiae ; the spurs of the latter are small, but distinct ; 

 empodia rather large. The wings are finely and evenry pubescent 

 on the whole surface ; those of the female are broader than those 

 of the male. The subcostal cross-vein is placed before the middle 

 of the length of the wing, at more or less distance from the origin 

 of the second longitudinal vein, and nearer to the root of the wing 

 than the tip of the seventh longitudinal vein ; the origin of the 

 second vein is near the middle of the wing, a little more distant 

 from the root of the wing than the tip of the seventh longitudinal 

 vein; prosfurca comparatively long (much longer than in Dicra- 

 nota and the two genera allied to it), angular, and often with a 



