CYLINDEOTOMINA. 289 



Section VII. CYLINDEOTOMINA. 



One submarginal cell ; the first longitudinal vein is incurved at the tip 

 towards the second, instead of ending in the costa (exception : P/ialacro- 

 cera replicata Lin., where the first vein takes the usual course) ; four or 

 five posterior cells ; a discal cell. The auxiliary vein is abruptly inter- 

 rupted, just before the stigma, without ending either in the costa or in 

 the first longitudinal vein. Eyes glabrous. Normal number of the an- 

 tennal joints sixteen.' Tibise with spurs at the tip. Empodia distinct. 

 Forceps and ovipositor of a peculiar structure (compare below). 



1. Definition akd Affinities. 



We have here a small, but very remarkable group of species, 

 occupying an isolated and intermediate position between the 

 Tipulidse hrevipalpi and longipaljn. Their affinity to the former 

 is justified by the following characters: 1. The structure of their 

 palpi, the last joint of which, although somewhat elongated, 

 never has the whiplash shaped appearance peculiar to the Tip. 

 longipalpi ; 2. The absence of the peculiar fold which, in most 

 of the Tipulina, runs across the wing, beginning in the region 

 of the stigma ; 3. The length of the inner marginal cell, which, 

 in the majority of Tijndina, is much shorter ; 4. The shape ancH 

 position of the penultimate posterior cell, which is situated behindl 

 the discal cell, instead of being alongside of it, which is the case 

 among the Tipulina ; 5. The number of posterior cells which, 

 as a rule, is four among the Giilivdrotomina, five being the ex- 

 ception ; whereas five is the rule among the Tip>idina : 6. The 

 number of antennal joints, sixteen, is also the prevailing number 

 among the Tipulidse brevipalpi, whereas thirteen is the usual 

 number among the Tipulidse longipalpi. 



' The European authors (Walker, Zetterstedt, etc.) call the antennre 17- 

 jointed, which may be due to the fact that in dry specimens the proloug.v 

 tion of the last joint looks like an additional one. 

 19 November, 1868. 



