TIPULA. 



299 



two portions forming the posterior or hinder side of the discal 

 cell, the proximal one abuts on the 2nd basal cell, and the distal 

 one on the penultimate posterior cell. 



Table of Species of Tipula.* 

 TABLE OF GROUPS. 



Wings either very conspicuously marked, or 

 else the species distinguished hy great size, 



at least 20 millim. GROUP 1 . 



Wings either not conspicuously marked (if 

 comparatively large species), or if so, then 

 less than 20 millim. in extreme length 

 (from tip of nasus to tip of genitalia). 



Wings distinctly marmorated GROUP 2. 



Wings with a few lighter and darker patches, 



or spots ; never uniformly unicolorous . . GROUP 3. 

 Wings practically or actually unicolorous . . GROUP 4. 



GROUP 1. 



1. Tibiae and tarsi with distinct whitish rings . 2. 

 Tibiae and tarsi without any whitish rings . 4. 



2. Femora with a whitish ring near tip ; 



wing-marks practically confined to the 



costa, wing-tip and cross-veins 3. 



Femora without any whitish ring ; wing 

 with various brown markings of quite 

 a different pattern to venusta and 

 yracillima patricia, sp. n., p. 313. 



3. Length 28 millim. ; antennae yellow, black 



at base of each joint; cross- veins suffused 

 with brown, a moderate-sized brown 



spot at wing-tip 



Length 17-18 millim. ; antennal scape 

 yellow, flagellum wholly black; cross- 

 veins absolutely clear ; apical spot much 

 smaller, black gracillima, sp. n., p. 302. 



4. Wings unicolorous or practically so, but 



generally with characteristic markings. 

 (Species with wholly clear wings not 



included in this section.) 



Wings not unicolorous 



venusta, Walk., p. 302. 



5. 

 10. 



* The present table of species of Tipula is a rather hybrid one, as it is 

 impossible to arrange them either satisfactorily or intelligibly in one unbroken 

 sequence. An absolutely arbitrary method is therefore perforce adopted, at 

 least temporarily, and the species roughly grouped in four divisions, which, in 

 a general way, are sufficiently distinct for the present study of them. This 

 table must be regarded more as a guide to the different species than an 

 absolute differentiation of them. T. vicaria, Walk. (p. 332) is not included in 

 the table. 



