TOXOKUINA. 421 



joint, sometimes broader tlian long ; the scape with a few short 

 bristles, the flagellum practically bare, the apical joints with a few 

 long bristly hairs on the npperside.* Thorax rather long, and 

 "remarkable for the great and unnsiial development of the 

 niesosteruura, in consequence of which the fore cox* are at a 

 considerable distance from the intermediate ones; the collare 

 is entirely concealed under the projecting gibbosity of the meso- 

 notum ; on the underside the prothorax is extended into a long 

 narrow cyUndrical neck, to which tlie head is fastened ; the 

 metathorax is also much developed, rather long and horizontal" 

 (Osten Sachm). Abdomen normal. Genitalia of the male some- 

 thing like that of EJiampJddia, consisting of a pair of claspers, 

 each clasper bearing two horny appendages. Ovipositor of female 

 long, slender, with almost straight valves. Legs long, slender, 

 microscopically pubescent : tibiie without spurs ; empodia imper- 

 ceptible ; " the last joint of the tarsus in the male shows on the 

 underside at the base, the excision characterizing the male sex in 

 many genera " ( OstenSacken). Wings iiavrow, especially at the base ; 

 no submarginal cell, no marginal cross-vein, a discnl ceil (normallv) 

 and four posterior cells; auxiliary vein running close to the Ist 

 longitudinal vein and ending in the costa nearly opposite the begin- 

 ning of the 2nd vein, the subcostal cross-vein placed near its tip : f 

 the 1st longitudinal vein short, entering the costa about the middle 

 of the wing, a little beyond the origin of the 2nd vein, and, instead 

 of running parallel to it and turning up more or less abruptly 

 to meet it, as is the case in most genera of the Limnobiinje, 

 it gradually converges towards the costa, eventually being merged 

 in it, the costa, just beyond the junction of the two veins, being 

 thus thickened ; the 2nd longitudinal vein not forked, vm^ therefore 

 there is no submarginal celf ; the 1st posterior cell alongside of 

 the marginal cell throughout its length ; the 2nd vein beginning 

 just beyond tlie middle of the wing, and gently bisinuate, the 

 praefurca forming nearly half its total length; anterior cross- 

 vein of moderate length, joining the end of the pr^furca to 

 the middle of the discal cell (when latter is present) ; the 'drd 

 longitudinal vein absent ; 4th longitudinal connected with 

 the 1st vein at their extreme bases by a distinct cross-vein ; 

 discal cell present or absent,i when present square, shorter 

 than the 2nd and 3rd posterior cells ; posterior cross-vein 



* Osten Sacken sajs that only the last two juints bear these isolated long 

 hairs (referring to two North-American species. T. mmina and muliehris); but 

 in the present Oriental species some of the other joints are equally furnished 

 with these cliaracteristic hairs. 



t Needham's figure of To.rorhina shows no subcostal cross-vein. 



+ This is an alteration from Loew's definition, to enable my specie.s 

 T. tncerta to be included in tlie genus. 



