60 DTPTERA OF NORTH AMERICA. [PART IV. 



sufficient importance to justify a generic separation of tliose few 

 species Avhich possess tliem, the genus Gloehina will have to be 

 abandoned. By all means Gloehina cannot be maintained as a 

 name of the group now called Dicranomyia. This name, as 

 shown above, has been proposed a year earlier, and was, from 

 the beginning connected with a series of those very species which 

 constitute it now. 



Table for the determination of the species. 



/^ Wings remarkably narrow, lanceolate (Tab. I, fig. 1). 



1^ 1 longipennis 5c//i/r/?. 



' Wings of the usual shape. 2 



r Tip of the auxiliary vein nearly opposite, or before, or only a short 



c \ distance beyond the origin of the second longitudinal vein. 3 



I Tip of the auxiliary vein a considerable distance beyond the origin 



L of the second longitudinal vein. IG 



q ( The whole antennrc, or at least their basal joints, pale. 4 



( The whole antennae black or brown. 7 



. ( Discal cell open. 5 



( Discal cell closed. fi 



f. ( Thorax with a single brown stripe in the middle. 2 immodesta 0. S. 



( Thorax with three brown stripes. 3 gladiator 0. S. 



P ( Flagellum of the antennae and halteres infuscated. 4 diversa 0. S. 



i Flagellum and halteres not infuscated. * 5 pudica 0. S. 



' Discal cell (in normal specimens) open ; tip of the auxiliary vein 



considerably anterior to the origin of the second vein ; the prse- 



furca is about equal in length to the distance between the origin 



of the third vein and the small cross-vein, or even shorter. 8 



Discal cell closed ; tip of the auxiliary vein nearly opposite the origin 



of the second vein (or, when anterior or posterior, the distance 



small) ; praefurca distinctly longer than the distance between the 



origin of the third vein and the small cross-vein. TO 



o f Rostrum and proboscis nearly as long as the head. G rostrifera, n. sp. 



( Rostrum and proboscis much shorter than the head. 



q f Thorax ochraceous. 7 brevivena, n. sp. 



I Thorax brown. 8 floridana, n. sp. 



/Thorax shining black, pleurae with a silvery reflection. 



10^ 15 morioides 0. S. 



'Thorax brownish or grayish. 11 



^, f Femora with a rather broad pale band at the tip. 14 badia TT'oM-. 



( Femora without such a band. 12 



/-The distance between the tip of the auxiliary vein and the subcostal 



,£, j cross-vein is nearly as long as the stigma. 13 



I The distance between the tip of the airxiliary vein and the subcostal 



'- cross-vein is shorter than half the length of the stigma. 14 



7-^ 



