3'2S Mr. F. Walker's Charncters of undescrlhed Diptera 



the third apical, paler than the others and much broader than 

 the first ; veins black, like those of the preceding species in 

 structure. 



Length of the body 3| lines ; of the wings 6 lines. 



Genus MicHOGASTER, Macq. 

 Michogaster basistriga. 

 Testacea, capite transverso antice depresso, antennarum articulo 

 3" linear!, pectore abdomineque nigris, tibiis posticis nigris 

 siibarcuatis, tarsis posticis basi albidis, alis vitreis macula 

 apicali nigra, venis Iransversis basalibus at preebrachiali 

 nigro-nebulosis, haiteribus albis. 

 Testaceous : head transverse, a little broader than the thorax, 

 flat and slightly oblique in front ; face retracted ; antennae not 

 extending to the epistoma ; third joint linear, rounded at the tip; 

 arista very slender, more than twice the length of the third joint; 

 pectus and abdomen black ; hind tibiae black, slightly curved ; 

 hind tarsi whitish towards the base ; wings vitreous, with a black 

 apical spot; basal transverse veins and prsebrachial transverse 

 vein clouded with black ; discal transverse vein almost straight 

 and upright, parted by less than half its length from the border 

 and by more than twice its length from the praibrachial trans- 

 verse vein ; halteres white. 



Length of the body 3 lines; of the wings 4^ lines. 

 South America. 



Michogaster marginalls. 



Testacea, antennis nigris longis, thorace fusiformi, abdomine 

 subclavato, pedibus longiusculis, tarsis nigris, alis vitreis 

 apud costam nigris, haiteribus apice nigris. 



Testaceous, slightly setose : head a little broader than the 

 thorax, oblique and depressed in front ; face retracted, and thus 

 forming an angle with the- front ; antennae black, extending to the 

 epistoma ; third joint linear, slender, very long ; arista very 

 minutely pubescent, longer than the third joint ; thorax fusiform ; 

 abdomen sub-tlavate, much longer than the thorax ; legs rather 

 long; tarsi black ; wings vitreous, black along the costa to a little 

 beyond the tip ; prasbrachial transverse vein clouded with black ; 

 discal transverse vein slightly oblique and curved, parted by one- 

 fourth of its length from the border and by twice its length from 

 the prsebrachial transverse vein ; halteres with black knobs. 



Length of the body 4 lines ; of the wings 5| lines. 



Amazon Region. 



