128 DIPTERA OP NORTH AMERICA. [PART IV. 



Wings (Tab. I, fig. 13, wings of A. picticornis) of moderate 

 length and breadth ; anal angle somewhat projecting ; veins with 

 a hardly perceptible pubescence. The tip of the auxiliary vein 

 and the origin of the second longitudinal vein are a little beyond 

 the middle of the length of the wing ; no trace of a marginal 

 cross-vein ; the prsefurca is short and arcuated (less than one- 

 third of the remaining portion of the second vein) ; third longi- 

 tudinal vein gently arcuated ; the first posterior cell a little 

 shorter than the submarginal ; its sides nearly parallel ; the 

 discal ceil is not much longer than broad ; the great cross-vein 

 is in a line with the inner end of the discal cell ; fifth vein 

 slightly arcuated beyond the great cross-vein • the sixth and 

 seventh veins are nearly straight. 



I do not perceive any spurs on the tibiae in the three specimens 

 which I have before me ; but most of their feet are broken off, 

 and I believe formerly to have seen spurs on the middle pair 

 of feet, which is lost now. The question about the spurs is 

 therefore left doubtful. 



The general appearance of the body is not unlike Limnobia, 

 only the antennas are comparatively longer. The genus can be 

 easily recognized by its long antennas and the absence of a 

 marginal cross-vein. 



The name of this new genus is derived from atappfc, fearless. 



Description of the species. 



1. A. picticornis, n. sp. % . — Ferrugineo-flava ; antennarum flagelli 



articulis singulis dimidio apicali infuscato. 

 Reddish-yellow ; the latter half of the single joints of the antennal flagellum 



mfuscated. Long. corp. 0.2—0.25. 



Ochraceous yellow, with a more or less reddish tinge. Head 

 yellow, front and vertex with a grayish reflection ; palpi mfus- 

 cated at the tip ; antennas yellow ; the single joints of the flagel- 

 lum pale brown at the tip, this brown gradually gaining ground 

 in the subsequent joints till the last joints are almost entirely 

 brown. Thorax reddish-yellow, shining above ; pleurae with a 

 very slight hoary reflection ; halteres ferruginous-yellow ; feet 

 yellow, tarsi brownish towards the tip. Abdomen yellow ; 

 penultimate segment dark; forceps yellow, the horny claw-shaped 

 appendages black. Wings with a pale yellowish tinge ; veins 

 yellow. 



