CYLINDEOTOMA. 359 



(4) In the inimbei' of the anteriHal joints — Hi, wliieli is the 

 usual number in tlie LiMNOBiiNiE, whereas in the Tipulin.e the 

 uornial number is 18. 



(5) In the number o£ posterior cells — four normally', but occa- 

 sionally five. This, however, is not so much a resemblance to the 

 LiMNOBiiN.Ti, where genera with five posterior cells are by no means 

 rare, as a difference from the Tipulinje, in which the usual number 

 of cells is five. 



There appears to be no direct affinity to the TiruLiN-.E, except 

 the general appearance, which is much more like that of a small 

 species of Tijnda than of a Limnobiid. Another possible point of 

 resemblance is that the Ctlindkotomini, though having only one 

 submarginal cell, have spurs to the tips of the tibiae, \vhereas all 

 those genera of Limnobiinje that possess only one submarginal cell 

 have no spurs to the tibiae ; but this, too, is rather a difference 

 from the Limnobiin.e than any actual affinity to the Tipulin^, 



The abrupt ending of the auxiliary vein is in itself a character 

 of an intermediate nature, as in the Tipulin.t: the vein nearly 

 always turns downwards into the 2nd vein, whilst in the 

 LiMNOBiix.Ti it generally turns upwards into the costa. 



" The Cylindkotomina, with all the prevailing characters of 

 the TiPULiDiE Brevipalpi, show important aberrations in the 

 course of the reins in the vicinity of the stigma — aberrations 

 which prove a leaning towards the TipulidtE Longipalpi. The 

 latent affinity to the latter is further proved by the presence of 

 spurs on the tibiae and by the general appearance." (Osten 

 tSacken.) 



The few genera making up this section are so closely interwoven 

 that there is some difficulty in separating them, and from the 

 point of view of some entomologists a separate genus might be 

 established for nearly every species, owing to the range of variation 

 shown in the antennae, the venation, the genital organs of the 

 male, and other characters. 



At present, however, only the genus Cylindrotoma itself has 

 been found in the East, with but a single species to represent it. 



Genus CYLINDROTOMA, Macq. 



Cylindrotoma, Macquart, Suites a Buffi, Dipt. i. p. 107 (1834). 



Genotype, Limnohia distinctissima, Mg. ; by designation of 

 Westwood (Introd. Class. Ins. ii). 



Head rather broad posteriorly. Eyes bare, separated by a broad 

 frons. Proboscis very short. Palpi somewhat elongate, especially 

 the last joint. Antennae with the 1st scapal joint very short, the 

 flagellum of elongate cylindrical joints, minutely pubescent, with 

 short thin scattered verticels ; in the female the antennae rather 

 shorter and less pubescent. TJioraw robust, compact, no con- 

 spicuous neck. Abdomen moderately long and slender, clubbed 



