364 



tion as in Figures 2, 5, 8, ii, Plate XXVII, the medio-cubital cross- 

 vein present ; surface hairs present on wings in some genera. 



Key to Genera* (Imagines) 



1. Wings with distinct surface hairs 2 



— Wings bare 4 



2. Cubitus forking sUghtly before the cross vein. . .Tanypus (p. 366). 



— Cubitus forking distinctly beyond the cross vein 3 



3. Anterior branch of radius (RJ forked at its apex 



Proienilies (p. 381). 



— Anterior branch of radius not forked T r idiot any pus\. 



4. Fork of cubitus petiolate 5 



— Cubitus forking proximad of the cross vein 6 



5. Anterior branch of radius (RJ forked at apex 



Prodadius (p. 390) . 



— Anterior branch of radius unforked Psilotanypus (p. 395). 



6. Anterior branch of radius forked at apex. . .Cwlofanypus (p. 396). 



— Anterior branch of radius unforked AnatopyniaX. 



Key to Larv.e 



1. Labium with 4 teeth (PI. XXV, Fig. 1) . .Tanypus dyari (p. 379). 



— Labium with at least 5 teeth 2 



2. Outer labial tooth divided, making in all 7 teeth (PI. XXV, Fig. 6) 



Prodadius concinnus (p. 394) . 



— Outer labial tooth not divided, only 5 teeth present 3 



3. Anterior branch of radius (RJ forked at its apex 



Tanypus sp. A (p. 397). 



— All labial teeth rounded, or sharp at apices 4 



4. Labial plate very much elongated and narrow, the teeth long and 



tinger-like (PI." XXV, Fig. 5) Tanypus sp. B (p. 398). 



— Labium not noticeably elongated, the teeth broad 5 



5. Middle tooth longest 6 



— Middle tooth not as long as outer tooth 7 



6. Teeth of labium forming a regularly rounded convex outline (PI. 



XXV, Fig. 3) Tanypus carneus (p. 378). 



— Second tooth distinctly shorter than central tooth (PL XXV, 



Fig. 11) Tanypus pilosdlus? (p. 373) . 



7. Lateral process of labium with its outer side fringed (PL XXV, 



Fig. 8) Proienilies cuUciforynis (p. 385). 



— Lateral process of labium bifid 8 



*My present material does not permit my giving generic keys for the larval or 

 pupal stages. 



tl have not seen this genus from Illinois. 



jThis genus has not been found in North America. 



