XXIl] LYNCHIA 375 



/Claws with the usual two points (heel and tip) . . . . . . =3 



\ Claws with three teeth .. .. .. .. .. .. .. =4 



f Ocelli present. Wings always well developed, but always in the female 



I and generally in the male becoming detached, so that only shreds 



3 ■> remain resembling rudimentary wings . . . . =Lipoptena. 



Ocelli wanting. Wings rudimentary. Legs much enlarged or elongated 



^ —Allobosca. 



r Ocelli present. Wings narrow, nearly ten times as long as broad, and 

 < longer than the abdomen .. .. .. .. =Sfenopteryx. 



L Ocelli absent. Wings not more than three times as long as broad .. =5 



/Wings as long as, or longer than, the abdomen • . =Oxypterum. 



\ Wing rudiments much shorter than the abdomen .. .. ., =6 



/ Veins of the wings distinct. Asiatic species .. .. =Myiophthiria. 



\ Veins of the wings indistinct. North American species = Brachypteromyia. 



Genus Lynchia Weyenhergh. 



Speiser^ gives the following diagnosis of the genus : " Head 

 without frontal eyes, antennal prolongations frequently bearing 

 characteristic brushes. Scutellum squarely cut off from the 

 thorax, almost four times as broad as long, often with con- 

 spicuous hairs. Legs normal, claws with accessory teeth and 

 rather large basal protuberances. Wings narrowly tapering, 

 consequently the venation is striking and characteristic. The 

 posterior basal cell is quite open, the posterior transverse vein 

 absent. The veins appear somewhat more compressed towards 

 the anterior border than in Olfersia Leach. Spec, typica : 

 L. penehpes Weyenbergh." 



Certain members of this genus have been shewn to transmit 

 Hcemoproteus columhcB and are probably responsible for the 

 spread of other kinds of Halteridia. 



L. lividicolor, Bigot (1885) ^ has been shewn to transmit 

 H. columbcB in Brazil. It is easily distinguished from the other 

 members of its genus by the brownish colour of the wings 

 instead of the usual milky-white. 



1 Speiser (1902). Studien iiber Diptera pupipara. Zeitschr. /. syst. 

 Hymenopterologie u. Dipterologie , vol. 11. p. 155. 



2 Bigot (1885). Ann. Soc. Ent. France, p. 238. 



