1921] NATURAL SCIENCES OF PHILADELPHIA. 223 



of the axillary vein is regular, while the anal vein in the appendic- 

 ular field curves strongly toward the caudad margin distad. 



The male of fusca will probably show other differences of more 

 diagnostic value than those of the wing venation. 



Type: cf ; Rio Itaya, Peru.^- February. [Paris Museum.] 



Size small for the genus of very small species, form relatively 

 moderately slender, coleopteroid. Head distinctly longer than 

 broad, with no distinct ridge above ocellar areas, ocellar spots 

 subobsolete ^^ Pronotum almost perfectly oval, surface weakly 

 convex. Tegmina comparatively narrow, rather strongly chitinous, 

 venation inconspicuous, costal margin very feebly convex proxi- 

 mad, thence nearly straight to distal portion, where it is oblique 

 and more markedly convex to the acute-angulate though bluntly 

 rounded apex, this apex situated beyond the axis of the tegmen 

 toward the sutural margin. Wings very elongate and narrow, over 

 twice as long as greatest width, costal veins (five) straight and 

 scarcely thickened distad, medio-discoidal area with two transverse 

 veinlets, the more distal heavy and appearing as a gradual curvature 

 of the discoidal vein to join the median vein, this veinlet sending 

 three veinlets distad ; appendicular field in length slightly over two- 

 fifths that of remaining portion of wing, length equal to width. 

 Supra-anal plate with free margin broadly convex, about twice as 

 wide as long; dorsal surface with a dehcate transverse ridge mesad, 

 which bears mesad on its cephalic face a tuft of microscopic hairs, 

 cephalad of which it is concave, the caudal margin of the preceding 

 tergite being roundly emarginate about this concavity. Subgenital 

 plate simple, bearing two very minute, short, simple, conical styles. 

 Limbs and their armament, tarsal claws and arolia as character- 

 istic of genus. 



Head light ochraceous-tawny, suffused with mummy brown 

 laterad above the clypeus, maxillary palpi dresden brown, with dis- 

 tal joints deepening to mummy brown. Antennae deep dresden 

 brown. Pronotum with disk immaculate light ochraceous-tawny, 

 lateral portions transparent, tinged with buff. Tegmina deep 

 chestnut brown, except the narrow marginal field, which is trans- 

 parent, tinged with buff. Wings tinged with mummy brown, this 

 weak proximad, very heavy in distal portion of anterior field and 

 anterior portion of radiate field. Ventral surface of abdomen 

 buffy brown mesad, shading to prouts brown laterad. Limbs and 

 cerci ochraceous-buff, the cephalic tibiae and tarsi weakly suffused 

 with brown. 



Length of body 5, length of pronotum 1.2, width of pronotum 

 1.6, length of tegmen 3.9, width of tegmen 1.3 mm. 



^' We describe this species here, as it is one of the two new species in the Paris 

 Museum collection from Peru, both of which are indeed representatives of the 

 fauna of the upper Amazonian drainage. 



^^ Possibly due to discoloration. 



