202 EXTOMOl^OOICAL NEWS. [ June. 'l8 



this article I wish to take up a similar problem in the Pediciini. 

 The tribe Pediciini is one of the smaller groups of Tipulidae, 

 in North America being made up as follows: Pcdicia (4) ; 

 Tricyphcna (22); Ornithodes (i), constituting the Pediciae ; 

 Rhaphidolabis (9) ; Dicranota (5) and Polyangaeus (i). con- 

 stituting the Dicranotae. The figures in parentheses are the 

 numbers of apparently valid species at the present writing. 

 The species described by Williston as Rhaphidolabis dcbilis is 

 not included ; the type is a mere fragment and the species, to 

 my knowledge, has not been rediscovered, the Alaskan speci- 

 mens so considered by Coquillett being a Tricyphona that was 

 later described as T. glacialis. 



It seems advisable to discuss at this time the reasons for 

 interpreting the venation of members of this tribe as has been 

 done in recent papers by the writer since the nomenclature 

 of the radial field that was used is ver\' different from that 

 hitherto accepted. Stated briefly, it may be said that the author 

 believes from the data that are now available that the vein 

 that has been called Ri is, in reality, Ri + 2, the short, oblique 

 branch of R2 having been hitherto called the radial cross- vein. 

 It has long been a striking character of this generalized group 

 that the so-called radial cross-vein was situated far out at the 

 tip of Ri, in some (as Polvangaens Doane. to judge from the 

 author's figure) being beyond the tip of 7?i and appearing as 

 a free branch of R2; in others (as Tricyphona vitripennis, 

 Rhaphidolabis flaveola, etc.) it is oblique and not unlike the 

 branch R2. Recently I have seen a remarkable crane-fly from 

 the north-western United States (7. protca) that proves that 

 the above interpretation is the correct one. the free portion 

 of R2 being long, oblique and fused with Ri only near the 

 wing-margin (see diagram 2). 



This interpretation readily disposes- of almost all the 

 Pediciine genera, fitting the condition in Pcdicia and in most 

 Tricyphona. It does not fit Ula because, as shown elsewhere, 

 this genus is a Limnophiline typet. The apparent exceptions 



X Alexander, Chas. P. Biology of the North American Crane-flies, 

 part 3. The Genus Ula Haliday. Pomona Journal of Entomology ano 

 Zoology, vol. 7. pp. 1-8, plate; 1915. 



