DIPTERA. 307 



Dexia obscuka. 



Cinerea ; caput fulvmn, argentatum ; thorax nigro quadrivittatus, scutello 

 fulvo ; abdomen fulvum. nigro vittatum, apice albo-micans ; antcmuE 

 fulva; pedes nigri, tibiis basi ftilvis ; alee cinerecB, ad costam fusca. 



Cinereous : head tawny, with a silvery u-hite covering, clothed behind 

 and beneath with white hairs ; frontalia deep black, widening from the 

 eyelets to the feelers : mouth black ; palpi tawny, slender : feelers tatvnij ; 

 third joint linear, more than twice the length of the second, not near reach- 

 ing the epistoma : chest with four black stripes, inner pair slender; scut- 

 cheon tawny with a cinereous covering : abdomen dark tawny, ivith ivhite 

 reflections at the tip, and with a black stripe which is widened on the hind 

 border of each segment : legs black ; thighs tawny towards the base ; an- 

 terior onychia long : ivings gray, brown beneath the fore border except at the 

 tips ; veins black, tawny at the base ; praebrachial vein forming a very 

 slightly acute angle at its flexure, curved inward near this and move 

 slightly so from thence to the lip ; lower cross-vein with two indistinct 

 curves, the lower one inward, the upper one outward : alula; dingy white 

 with a tawny tinge towards the bordels : halteres tawny. Length of the 

 body 6| lines : of the wings 14 lines. 



Brazil. 



Di:XIA FUSIFORMIS. 



Cervina ; caput album ; thorax yiigro quadrivit talus ; abdomen tcstaceum, 

 albo-micans, nigro vittattim ; antenna: rufw ; pedes fulvi, tarsis ni- 

 gris ; ala: subcinerecc. 



Fawn-colour : head with a shining while covering ; frontalia ferrugi- 

 nous, widening from the eyelets to the feelers ; facialia without bristles ; 

 epistoma not promineiit ; lateralia red : eyes bare : palpi tawny : feelerg 

 pale red ; third joint tapering to the tip, not nearly reaching the epistoma ; 

 sixth black, feathered, slender, thick at the base, more than twice the 

 length of the third : chest with four black stripes : abdomen testaceous, ob- 

 conical, longer than the chest, ivith whitish reflections, and with a black 

 stripe 7vhich is ividened at the base : legs taumy ; feet black ; wings slightli/ 

 gray ; veins black, tawny towards the base ; praebrachial vein fonniug a 

 hardly acute angle at its flexure, near which it is bent inward, and very 



