242 NEW YORK STATE MUSEUM 



fork is usually more or less skewed forward, and the an- 

 terior deflection of Cu^ generally meets the middle of cell 

 I St M^. In a good many genera the first fork of the radial 

 sector is skewed posteriorly, in opposition to that of media, thus 

 widening cell R. Two aberrant genera Trichocera and Diazoma 

 have the second anal vein short, the deflection of Cu^ meeting cell 

 1st M^ beyond, its middle and Sc^ far retracted. The degenerate 

 Rhicnoptila has the cross vein r touching Rs unusually far forward 

 and an aberrant t pe of branching of the sector, both characters 

 seen elsewhere in Amalopis and Pedicia of the Pediciini. Phyllo- 

 labis is aberrant also in its abbreviated subcosta, which ends before 

 the origin of the radial sector, in its abbreviated R" and in its 

 widening outward of cell ist M" — all characters found in Gono- 

 myia.'' Podoneura is marked by its two branched second anal vein, 

 the recession of the deflection of Cu^ a little distance within the 

 first median fork, and the recession of Sc^ already mentioned. 

 There are no highly specialized members of this tribe. Limno- 

 p h i 1 a t o X o n e u r a O. S. [pi. i8, fig. 2] is fairly typical. 



The Pediciinae show a marked recession of Sc^ toward the wing 

 base, and a straightening out of the cord. Both Rs and M have 

 usually three branches, the former with the second fork deep and of 

 variable type. Amalopis i n c o n s t a n s O. S. is exceedingly 

 variable sometimes in its venation.^ But not everywhere and 

 always, for I have been especially looking for variation and 

 have collected this species both east and west in large numbers, 

 and alas, all my specimens appear to be quite normal. This is the 

 only species of Limnobiinae in which I have found the median 

 cross vein touching M^ after its separation from AP [pi. 25, fig. i]. 

 Dicranota Rhaphidolabis and Plectromyia are set apart by a 

 behavior of the median vein that is just the opposite of that here- 

 tofore noted for the Cylindrotomini. The base of it is in direct 

 line with M^"^^, and M^ is offset on the posterior side. 



The Eriopterinae constitute a large assemblage of heterogeneous 

 forms among which several distinct groups of genera are seen. The 

 niedian vein is usually two branched (in Cladura three branched) 

 and the sector is three branched. Molophilus and Conosia tend to 

 depart from the typical Tipuline type of branching of the sector 



' T believe Phyllolabis Doane should be associated with Gonomyia, but it 

 it is net quite clear to me from the sti'dy of the venaticn alone jrst wh^-e 

 Gonomyia should be located among the tribes. 



2 Witness the figures of Johnson in Entomological News, 12:306, text 

 fig. 1-6. 



