488 TIPULID^. 



the vein but sometimes much shorter ; the marginal ci-oss-vein near 

 the inner end o£ 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 prfefurca, being almost (apparently) a con- 

 tinuation of the basal section of the prajfurca, 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, Gth, and 7th veins gently curved towards their tips. 

 Eaiuje. Europe, South and East Africa, Australia, Ne^^• Zealand, 

 North and South Auierica and the Orient. 



Table of Species. 



1. Wiugs -wholly unmarked, of normal 



length ; antennne not 15-jointed 2. 



Wings with several conspicuous brown 

 marks, considerably longer than the 

 abdomen ; antenuc^ 15-jointed hmjij^ennis, sp. n., p. 489, 



2. Marginal cross-vein present J 3. 



Marginal cross-vein absent ; anterior 



branch of 4th longitudinal vein forked, 

 posterior brancli simple ; discal cell open, 

 coalescent with ord posterior cell ; 

 posterior cross-vein at base of ord 

 posterior cell ; a dark blackish species 

 with distinct black veins in the wing . . niyra, sp. u., 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 ; antennae 

 13-jointed (jenitalis, 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 Avhich many specimens were seen by him without 

 it, although normally it sliould have been jJi'esent in that species. In this 

 sneeies, too, the abdomen is more clubbed at the tip, and the genitalia are of 

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

 ■ijyhicli there was no marginal vein at all, and the discal cell was open, being 

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

 Erioptera laferalts, 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 

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

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

 iipproximately parallel to be readily confounded with the very widely opened 

 fork of Gonomyia. 



t Exceptions occur; for instance, iu G. flavomaryinata, 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. 



