Tiri^LIDTE. 35 



ANISOMERINI. 



1. Three posterior cells ; two subni.arginal cells. Anisomera Meigen. 

 Four or five posterior cells ; antenna^ of the $ sometimes imicli elon- 

 gated. ............ 2 



2. The stigma occupies nearly the whole space between the tip of the aux- 



iliary vein and the marginal cross-vein. . . Eriocera Macquart. 



The stigma occupies but a small portion of the sf)ace between tlie tip of 



the auxiliary vein and marginal cross-vein. Pentiioptera Schiner. 



AMALOPINI. 



1. Antennae composed of thirteen joints. ...... 2 



Antennaj composed of sixteen or seventeen joints. ... 4 



2. Two cross-veins between the first longitudinal vein and the anterior 



branch of the second vein. . . . Dicranota Zetterstedt. 



Only one cross- vein between these veins. . . . . . p3 



3. Five posterior cells, both branches of the fourth vein furcate. 



RuAi'HiDOLABis OstcH Sackcn. 

 Four posterior cells, the posterior branch furcate. 



Plectromyia Osten Sacken. 



4. Four posterior cells; wings pubescent. . . . Ula Ilaliday. 

 Five posterior cells ; wings bare. ....... 5 



5. Anterior cross-vein nearly at right angles with the longitudinal axis of 



the wing. Amaloims Ilaliday. 



Anterior cross-vein at a very oblique angle with the longitudinal axis of 

 the wing and parallel with the posterior cross-vein. 



Pedicia Latreille. 



OYLINDliOTOMTNI. 



1. Five posterior cells; colors yellow and black. 



Cylindrotoma Macquart. 

 Four posterior cells. ......... 2 



2. Antennal joints subcylindrical, elongated .'> 



Antennal joints subglobular; head and thorax conspicuously {)unctulatc. 



Triogma Schiner. 



3. Colors yellow and black Liogma Osten Sacken. 



Colors brownish and grayish. . . . Phalacrocera Schiner. 



PTY0II0I'TERIX^5. 



1. First subniarginal cell much shorter than the second. 



Idioplasta Ostt'ii Sacken. 

 First submarginal cell much longer than the second. ... 2 



