inii] Alexander — New Nearclic Tipididae Diptera ' 171 



dust. Pleura; ilark brownish-black, grey-dusted. Ilaltercs, stem pale, knob 

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

 ish-yellow; femora and tibiie 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 bfeyond the fork of Rj+j; Hi long, cross-vein r very 

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

 r or r-tii; cross-vein r beyond the middle of Rj; 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, bro\Tnish-yellow. 



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



Type coll. Acad. Xat. Sci. Phil. 



Most closely allied to R. fermipes 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 Mo, etc. 



R. dibilis Will.' ap]>ears to be a TricypJiona 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 

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



Explanation of the Plate 13. 

 1. Wing of Limnobia argenteceps, sp. n. 

 " " EUiptera astigmaiica, sp. n. 



3. " " Trimicra pygmaea, sp. n. 



4. " " Limnophila laricicola, sp. n. 



5. " " Rhaphidolabis ncomexicana, sp. n. 



6. " " Eriocera albihirla, sp. n. 



7. " " E. fultoncnns, sp. n. 



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



9. " " K. cinerea, sp. n. 



10. " " E. longicornis Walker. 



' WilUston, Kani. Univ. Quart.; vol. 2; p. 62; Oct. 1893. 



2. 



