CHIRONOMID.E. 113 



Stenoxenus Coquillett, (fig. n) referred by its author to 

 a new family. Mr. Coquillett's interpretation of the 

 neuration is clearly wrong: the fourth vein is coalescent 

 with the third and first for a considerable distance, but 

 all three veins are distinct distally and of the usual Chi- 

 ronomid structure. The genus was based upon a single 

 female specimen without antennae, so that its more exact 

 position in the family must await further study. 



TABLE OF GENERA. 



P.V PROF. O. A. JOHANNSEN. 



1. First, third and fourth longitudinal veins coalescent for the larger 



part of the distance between the humeral cross-vein and the 

 posterior branch of the fourth; third vein long, not connected 

 with 'the first vein by a cross-vein; front concave (11). 



Stenoxenus. 

 Fourth vein not at all coalescent with the first. ... 2 



2. Wings short, strap-like, thickened, and without distinct venation. 



Eretmoptera. 

 Wings normal. ......... 3 



3. Posterior (i. e. the 'anterior basal') cross-vein present, the second 



basal cell complete. ........ 4 



Posterior cross-vein absent, no second basal cell. ... 14 



4. Antennae with fifteen joints in both sexes, rarely twelve or four- 



teen jointed in the female; long plumose in the male, penulti- 

 mate joint elongate, apical joint very small. (Tanypus, sens. 

 lat.) 5 



Antennae of the male with nine or with fourteen joints, the female 

 with seven or eight joints. . . . . . . .12 



5. Wings bare, .......... 6 



Wings hairy. . . . . ; . . . . . . 9 



6. Fork of the fifth vein petiolate. ...... 7 



Furcation of the fifth vein slightly proximad of the posterior 



cross-vein. .......... 8 



7. First vein forked at its extremity (9) . . Procladius Skuse. 

 First vein simple Psilotanypus Kieffer. 



8. First vein forked at its extremity. . Anatopynia Johannsen. 

 First vein simple. ..... Protanypus Keiffer. 



