CYLINDEOTOMA. 359 



(4) In the number of the antennal joints 16, which is the 

 usual number in the LlMlTOBlEBrjE, whereas in the TIPULIN^E the 

 normal number is 18. 



(5) In the number of posterior cells four normally, but occa- 

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

 LIMNOBIINYE, where genera with five posterior cells are by no means 

 rare, as a difference from the TiPULiKa:, in which the usual number 

 of cells is five. 



There appears to be no direct affinity to the TIPULIN^E, except 

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

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

 resemblance is that the CYLLNDBOTOMINI, though having only one 

 submarginal cell, have spurs to the tips of the tibiae, whereas all 

 those genera of LIMNOBIIITJE that possess only one submarginal cell 

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

 from the LIMNOBIINVE than any actual affinity to the TIPULIN^E. 



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

 of an intermediate nature, as in the TIPULIN^E the vein nearly 

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

 LIMNOBILN^E it generally turns upwards into the costa. 



'* The CYLIXDKOTOMIKA., with all the prevailing characters of 

 the TIPULID^E BKEVIPALPI, show important aberrations in the 

 course of the veins in the vicinity of the stigma aberrations 

 which prove a leaning towards the TIPULIDJE LONGIPALPI. The 

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

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

 iSacken.) 



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 antennas, 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 Buff., Dipt. i. p. 107 (1834). 



GENOTYPE, Limnolia disiinctissima, 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. Antenna with the 1st scapal joint very short, the 

 fiagellum of elongate cylindrical joints, minutely pubescent, with 

 short thin scattered verticels ; in the female the antennae rather 

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

 spicuous neck. Abdomen moderately long and slender, clubbed 



