317 



ferruginous ; feet black : wings gray, yellow at the base and along three- 

 fourths of the fore border, brownish at the tips and along the i-eins ; veins 

 tawny, brown towards the tips, pracbracliial vein forming a curve at its 

 flexure, straight from thence till near the tip where it is slightly bent in- 

 ward, lower cross-vein hardly bent inward towards the tip: alulae and 

 halteres pale yellow. Length of the body 4| lines ; of the wings 8 lines 



Amazon River. 



Dexia suffusa. Fern. ~ /«^vi^)»-t<r76s. 



Nigra, subaurata ; caput album ; abdomen fulvum, apice nigrum ; an- 

 tenna fulvce ; pedes fulvi, tarsis nigris ; alee subcinerece, basi et ad 

 cos tarn subfulvce. 



Black, with a slightly gilded covering : head with a snow-iuhite covering 

 in front ; frontalia black, linear; facialia without bristles; epistoma not 

 prominent; palpi tawny : feelers tawny; third joint mostly darker, linear, 

 rounded at the tip, not reaching the epistoma, more than twice the length 

 of the second ; sixth black, feathered to the tip with short hairs, more than 

 twice the length of the third : abdomen tawny, obconical, longer than the cliest, 

 with a few black spines, black towards the tip : legs tawny ; shanks darker 

 than the thighs ; feet black : ivings slightly gray, with a tairny tinge at the 

 base and along the veins and on part of the fore border which has a pale brown 

 tinge towards the tip ; veins tawny, pitchy towards the tips ; praibrachial vein 

 forming a curve at its flexure, almost straight from thence to its tip ; lower 

 cross-vein with a very slight inward curve near the base, and a more in- 

 distinct outward curve in the middle: alula; and halteres yellow. Length 

 of the body 3i lines ; of the wings 7 lines. 



ic^^T^ve/w-Avta r^2cv<2Auri 



Dexia albifrons, Mas. 



Cinerea ; caput album ; thorax nigro quadrivittatus ; antennce nigra, basi 

 rufce; pedes nigri, tarsis ferrugineis ; alee cinere</', busi subfuscce. 



Black, ?<j</i a cinereous covering : head with a ichite covering ; frontalia 

 black, with a ferruginous disk, widening from the eyelets to the feelers ' 

 facialia without bristles; epistoma tawny, prominent; lateralia ferruginous ; 

 peristoma ferruginous, prominent: mouth black, nearly as long as the 

 chest, tawny at the base; palpi yellow, long, slender: feelers black; first 



•<> T 



