TIPULID^E. 35 



ANISOMERINI. 



1. Three posterior cells; two submarginal cells. ANISOMERA Meigen. 

 Four or five posterior cells ; antennae of the $ sometimes much 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 space between the tip of 



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



AMALOPINI. 



1. Antennae composed of thirteen joints. 2 



Antennae 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. ..... 5 



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



RHAPHIDOLABIS Osten Sacken. 

 Four posterior cells, the posterior branch furcate. 



PLECTROMYIA Osten Sacken. 



4. Four posterior cells; wings pubescent. . . . ULA Haliday. 

 Five posterior cells ; wings bare 5 



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



the wing. ~\ . , . . . AMALOPIS Haliday. 



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

 the wing and parallel with the posterior cross-vein. 



PEDICIA Latreille. 



CYLINDROTOMINI. 



1. Five posterior cells ; colors yellow and black. 



CYLINDROTOMA Macquart. 

 Four posterior cells. .' . . . . , .... 2 



2. Antennal joints subcylindrical, elongated. . , . . . 3 

 Antennal joints subglobular ; head and thorax conspicuously punctulate. 



TRIOGMA Schiner. 



3. Colors yellow and black. . . .. LIOGMA Osten Sacken. 

 Colors brownish and grayish. . . . PHALACROCERA Schiner. 



PTYCHOPTERIN^E. 

 1. First submarginal cell much shorter than the second. 



IDIOPLASTA Osten Sacken. 

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



