136 ENTOMOLOGICAL NEWS. [April, '07 



situation. It was not common in eitlicr locality, and I have not 

 found a specimen in ten years. 



I wish the few remarks above about the habitat of species 

 of this genus might interest collectors in scanning trunks of 

 trees more closely. Not only Scellns, but Medctcnis and Neuri- 

 gona, of the Dolichopodidse, are found there, as well as flies 

 of other families. 



Students of secondary sexual characters could not find a 

 more interesting group than Scelhis; for lack of space, I have 

 not half described the peculiarities of the male in virago, and 

 all the species have nearly as many male characters. 



TABLE OF SPECIES OF SCELLUS, BASED ON THE MALES. 



1. Third antennal joint elongated, with apical arista .... virago n. sp. 

 Third antenna] joint not elongated, with dorsal arista 2. 



2. Hind femora greatly thickened and arcuated, wings wholly blackened. 



exnstus Walker, 

 Middle femora arcuated, thickened towards the middle, wings not 



entirely blackened 3. 



Middle and hind femora not arcuated avidus Loew. 



3. Apical half of the wings black, thorax above with snow-white pollen. 



spinimanus Zetterstedt. 

 Not as described 4. 



4. Anal appendages terminating in spoon-shaped, orange-colored en- 



largements monstrosu.s Osten Sacken. 



Anal appendages not enlarged at tip 5. 



5. Hind femora along the middle with abundant, long white pile . vigil 



Osten Sacken, 

 Hind femora without white pile filiferas Loew. 



