488 ' TIPULIDjE. 



the vein but sometimes much shorter ; the marginal cross-vein near 

 the inner end of the 1st submarginal cell, or at about the middle 

 of it, occasionally exactly at the fork of the 2nd vein, and, in rare 

 cases, absent altogether;* the 3rd vein generally originating 

 from the angle in the praefurca, being almost (apparently) a con- 

 tinuation of the basal section of the prsefurca, and curved down- 

 wards towards its tip ; f the anterior cross-vein immediately 

 beyond the origin of the 3rd vein, moderately long, joining the upper 

 basal corner of the discal cell, which latter is oblong, with pointed 

 ends, the posterior cross-vein being situated before the middle 

 of it ; the 5th, 6th, and 7th veins gently curved towards their tips. 

 Range, Europe, South and East Africa, Australia, New Zealand, 

 North and South America and the Orient. 



Table of Species. 



1. Wings wholly unmarked, of normal 



length ; antennae not lo-jointed 2. 



Wings with several conspicuous brown 



marks, considerably longer than the 



abdomen ; antenna? 15-jointed lonyipennis, sp. n., p. 489, 



-2. Marginal cross-vein present \ 3. 



Marginal cross-vein absent ; anterior 



branch of 4th longitudinal vein forked, 



posterior branch simple ; discal cell open, 



coalescent with 3rd posterior cell ; 



posterior cross-vein at base of 3rd 



posterior cell ; a dark blackish species 



with distinct black veins in the wing . . nigra, sp. n., p. 494. 

 3. Marginal cross-vein exactly at the foot of 



the 2nd longitudinal vein (or even very 



slightly before it) ; genital organs of 



male very large and conspicuous ; antenna 



13-jointed genitalis, sp. n., p. 490. 



* The marginal cross-vein is very inconstant, even in the same species, 

 both as regards its exact position and its presence or absence, as Osten Sacken 

 mentions a German species of which many specimens were seen by him without 

 it, although normally it should have been present in that species. In this 

 species, too, the abdomen is more clubbed at the tip, and the geuitalia are of 

 different construction. He also possessed another species, from Italy, in 

 which there was no marginal rein at all, and the discal cell was open, being 

 coalescent with the 3rd posterior cell. This species he thought might be 

 Erioptera lateralis, Mcq., but it is to be noted that in Prof. Kertesz's recent 

 * Catalogue of Diptera ' lateralis is referred to Gonomyia. It is, of course, 

 possible that Osten Sacken's identification of the species was erroneous. 



The fact that the marginal vein is occasionally absent in this genus may be 

 considered likely to cause confusion between it and Gonomyia, the species 

 having considerable resemblance to one another, but in the present genus the 

 branches of the 2nd longitudinal vein (which is always forked) are much too 

 approximately parallel to be readily confounded with the very widely opened 

 fork of Gonomyia. 



t Exceptions occur; for instance, in G. flavomarginata, Brun., a compara- 

 tively long basal rectangular section is present. 



\ This cross-vein is occasionally absent, but no better or more reliable 

 distinctive character is available. Such exceptions must be allowed for in 

 determining specimens. 



