Kahl: The Dipterous Genus Leucophenga Mik. 379 



Third vein ends in the shghtly pointed apex of the wing; second vein curved at 

 apex (apparently less so than in hasemani); distance between tips of second and 

 third veins about twice the distance between tips of third and fourth veins; first 

 posterior cell hardly wider at middle than at apex; the distance between anterior 

 and posterior cross-veins hardly one-fourth longer than first section of third vein; 

 posterior cross- vein about the length of the ultimate section of fifth vein; fourth 

 vein thin in its apical course; costa fuscous, other veins yellowish, but blackish 

 where the brown marks cover them; vein closing the anal cell blackish. 



The fronto-orbital, vertical, and ocellar bristles of almost the same size, the latter 

 only slightly weaker; the upper reclinate fronto-orbital bristle nearer to the inner 

 vertical than to the lower reclinate and distinctly higher up than the lower ocellus; 

 the uppermost setula in the occipito-orbital fringe is longer than and divergent 

 from the other setulae in the fringe (this may be a feature common to all species) ; 

 postverticals minute, strongly convergent, touching at tips; lower occipital orbit 

 with the usual setula. differentiated from the other setulse in the lower occipito- 

 orbital fringe; between the two diverging sternopleural bristles a minute setula; the 

 anterior dorso-central bristle slightly weaker than the posterior one and of the same 

 size as the prescutellar pair, which are situated on a level with the posterior dorso- 

 central; the presutural and anterior supra-alar of almost the same size and distinct, 

 though weaker than the humeral and notopleurals; the posterior postalar distinct, 

 the two apical scutellar bristles decussate (in the specimen), the lateral ones di- 

 verging. As in hasemani the bristles appear in certain lights yellow, or yellowish 

 brown, particularly the lower fronto-orbitals, humerals, and notopleurals; on middle 

 coxae a yellowish brown bristle. 



Habitat: Bolivia, Province del Sara, 350 meters above sea-level. 

 The type is a female, unique, collected by Jose Steinbach, Carn. IVIus. 

 Ace. No. 5080. 



The species is very close to hasemani and the description of one is 

 almost a duplicate of the other, but this species is much smaller, and 

 the pronounced v;hite bloom of the mesonotum and scutellum and 

 the silvery white abdomen serve to distinguish it. 



For those who at some future time may desire to study the type of 

 argenteiventris I must state, that after I had taken the description of 

 the color, I relaxed the specimen on damp sand, so that I might study 

 the venation of the wings, which were folded under the abdomen, but 

 in doing so the moisture entirely effaced the clear white bloom of the 

 mesonotum and scutellum and the silvery white of the abdomen, -so 

 that the type, as it stands, does not conform to the above description. 

 It is important to remember this. 



6. Leucophenga ornativentris sp. nov. 



Diagnosis: Head yellow with upper occiput mostly blackish, an- 

 tennae and palpi yellow, the latter neither enlarged, nor projecting. 



