LIST OF DIPTERA. 837 



Dexia Prexaspes, n. s., rnas. Ferruginea, capitis vitta thoracisque 

 disco piceis, abdomine nigro vittato, cano tessellato , palpis Jlavis, 

 antennis fulvis apice ferrugineis, pedibus ferrugineis, tarsis ni- 

 gris, alis subcinereis, basi costa venarumque marginibus subful- 

 vis. 



Body clothed with black hairs and bristles : head ferruginous, 

 dark tawny above ; a pitchy stripe fringed with bristles widening 

 from the eyelets to the feelers ; epistoina and face tawny ; epistoma 

 hardly prominent ; sides of the face fringed with bristles nearly 

 along the whole length : eyes red ; fore part slightly convex, its fa- 

 cets larger than those elsewhere : sucker black, pale ferruginous, 

 and clothed with tawny hairs towards the tip ; palpi yellow, beset 

 with black bristles : feelers tawny, very short, not half the length of 

 the face ; third joint ferruginous, linear, rounded at the tip, hardly 

 longer than the second ; bristle black, stout at the base, feathered 

 with rather long hairs, more than thrice the length of the third 

 joint : chest and breast ferruginous, adorned with hoary reflections; 

 disk of the chest somewhat pitchy : abdomen ferruginous, obconi- 

 cal, tessellated with hoary reflections, a little longer, but not broader 

 than the chest, adorned along the whole length with a black stripe, 

 which is broader above than beneath : legs ferruginous, clothed with 

 black hairs and bristles ; feet black ; foot-cushions tawny : wings 

 pale gray, with a slight tawny tinge at the base, on the fore borders, 

 and along the borders of the veins ; wing-ribs ferruginous ; veins 

 black, ferruginous at the base ; tip cross-vein perpendicular to the 

 fourth longitudinal vein, with which it forms a curve at their union, 

 curved inward near the base, straight from thence to the tip, joining 

 the border at some distance above the tip of the wing ; lower cross- 

 vein with two very slight curves, the lower inward, the upper out- 

 ward ; scales gray, with a tawny tinge. Length of the body 5 

 lines ; of the wings 10 lines. 

 a. Georgia. From Mr. Abbot's collection. 



Dexia Halone, n. s., mas. et fern. Ferruginea, thorace quadrivit- 

 tato, cano micante, mari. abdominis dorso piceo vittato lateribus 

 cano micantibus, palpis fulvis, antennis luteis, pedibus ferrugi- 

 neis, alis sublimpidis basi subfulvis. 



Body pale ferruginous, clothed with black hairs and bristles : 

 head mostly adorned with a white covering ; a dark ferruginous fur- 

 rowed stripe, fringed with bristles, widening from the eyelets to the 

 feelers ; sides of the face prominent and fringed with bristles for 

 half the length from the base ; epistoma not prominent : eyes red : 

 sucker ferruginous, clothed at the tip with tawny hairs ; palpi 



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