282 Records of the Indian Mtiseum. [Vol. XV, 



and the 2nd vein (which would be the marginal cross vein) must be 

 incorrect. 



Osten Sacken admits a " more or less indistinct cross vein connects 

 the 1st vein with the costa." 



This is my costal cross vein which is present {Cylindrotoma, indis- 

 tinctly ; Stibadocera) , or absent {Triogma, Liogma, Stibadocerella). 



2nd and 3rd veins. — -These diverge at varying distances, as is 

 the case in many other groups, either just before, or at, or a httle beyond 

 the anterior cross vein (all genera except Stibadocerella) or else half way 

 between the anterior cross vein and the wing-tip as in the latter genus. 



Anterior cross vein. — ^Normally present, but absent in Triogma 

 and Liogma, effectually characterising these genera though, as has been 

 stated, it is not always constant even in the same species. 



Number o£ posterior cells. — Four in all genera except Cylin- 

 drotoma, which has five. 



Antennae. — These have conspicuously long and copious verticils in 

 Stibadocera and Stibadocerella, but they afford no characters out of the 

 common in the other genera. 



Punctulation o£ thorax. — This very unusual character in Tipulidae 

 exists only in Triogma, Liogma and Stibadocerella. 



On the above general conclusions the following table of genera may 

 be offered : — ■ 



A. Anterior cross vein absent ^ : tliorax punctulate. 



n. Flagellar joints subglobiilar ...... Triognui. 



BB. Flagellar joints subcylindrical, elongate . . . Liogma. 



AA. Anterior cross vein present : thorax not jjunctulate 

 except in Stibadocera. 



C. Five postei'ior cells ....... Cylimlrotoina. 



CC. Four posterior cells . 



D. Thorax punctulate ....... Stibadocera. 



DD. Thorax not punctulate. 



E. Verticils of antennae very short : 2nd and 3rd veins 



diverging at about anterior cross vein . . . Phalacrocera. 



EE. Verticils of antennae very long and consincuous : 

 2nd and 3rd veins diverging half way between an- 

 terior cross vein and wing tip .... Stibadocerella. 



In Osten Sacken's figure of his Liogma nodicornis ^ he shews the 

 auxiliary vein distinctly ending free without any trace of a cross vein 

 above or below, but Needham's figure of the same species shews the 

 auxiliary vein as distinctly ending in the costa with a very distinct 

 subcostal cross vein present. I cannot decide which is correct. 



Enderlein's interpretation of the venation in Stibadocera is open 

 to doubt. He speaks of the 2nd vein being joined to the 1st by a 

 cross vein (which would, of course, be the marginal cross vein, though he 

 does not recognise it as such). What he considers the tip of the 1st vein 

 is really the costal cross vein, the 1st vein really ending in the 2nd as 

 normally in this section. Alexander's figure of S. metallica, sp. nov. 

 agrees in venation with Enderlein's species, bullans, from Sumatra. 



^ Present occasionally in individual specimens in one sijecies. 



- The difference between Triogma and Liog^na is weak but no other appears to have 

 been put forward. Osten Sacken gives no definite character by which to separate them. 

 2 " Cylindrotoma " nodicornis., Monog., pi. i, 7. 



