1912] Alexander — Netv Nearctic Tipulidae Diptera 171 



dust. Pleurae dark brownish-black, grey-dusted. Halteres, stem pale, knob 

 brown. Legs: coxae brownish-yellow, more greyish anteriorly ; trochanters brown- 

 ish-yellow; femora and tibiae uniform medium brown; tarsi gone. 



Wings: hyaline or sub-pearly; a prominent elongate dark brown stigmal spot; 

 veins brown, the longitudinal veins rather paler at the wing-root. Venation: 

 (See fig. 5): Sc long extending beyond the fork of R2+3; Ri long, cross-vein r very 

 near its tip; Rs short, oblique; R2+3 very short, only a little longer than cross-veins 

 r or r-m; cross-vein r beyond the middle of R2; Mi about as long as Rs; no cross- 

 vein m; basal deflection of Cui beyond the fork of M. 



Abdomen: dark brown, the pleural sutures lighter brown; valves of the oviposi- 

 tor light colored, brownish-yellow. 



Holotype, 9, Beulah, New Mexico: June 29, 1902. 



Type coll. Acad. Nat. Sci. Phil. 



Most closely allied to R. tenuipes O. S. of the Eastern United 

 States, but differs in its wing coloration, apparent lack of thoracic 

 stripes, dark stigmal spot and venational details, i. e., more oblique 

 Rs, shorter and more divergent Mi and M2, etc. 



R. debilis Will.^ appears to be a Tricyphona by its venation 

 (R2+3 fused and R4 and R5 separate). It agrees most closely with 

 T. vitripennis Doane. 



The members of this tribe, Pedicini, require careful study at the 

 hands of some competent student who has access to an abundance 

 of Western material. The West appears to be the center of dis- 

 tribution for the members of this group, which, in other parts of 

 the continent, are represented only by a few species, or else, as in 

 the tropics, quite lacking. I surmise that such a study, based on 

 sufficient material, would show congenerousness of Plectromyia 

 O. S. and Rhaphidolabis O. S., with Dicranota Zett. 



Explanation of the Plate 13. 



1. Wing of Limnohia argenteceps, sp. n. 



2. " " Ellipfera astigmatica, sp. n. 



3. " " Trimicra pygmaea, sp. n. 



4. " " Limnophila laricicola, sp. n. 



5. " "Rhaphidolabis neomexicana, sp. n. 



6. " " Eriocera alhihirta, sp. n. 



7. " " E. fullonensis, sp. n. 



8. " " E. fuliginosa O. S. (or related species) 



9. " " E. cinerea, sp. n. 



10. " " E. longicornis Walker. 



1 Williston, Kans. Univ. Quart.; vol. 2; p. 62; Oct. 1893. 



