268 DIPTERA OF NORTH AMERICA, [PART IV. 



2. A. awripennis 0. S. % . — Fiiscana, alis immaculatis, veni^lig 

 traiisversis ceiitralibus auguste fusco-marginatis ; cellula submarginalis 

 prima secundS, parum brevior. 



Brownish, wings immaculate, central cross-veins slightly clouded with 

 brown ; the first submarginal cell is a little shorter than the second. 

 Long. corp. 0.5. 



Syn. Amalopis auripennis 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 247. 



Head grayish, vertex sliglitly brownish in the middle ; palpi 

 brown, somewhat pale at the basis ; antennae very short, three or 

 four basal joints yellowish, the remainder brownish ; joints from 

 the fourth to the tenth short, crowded, gradually attenuated to- 

 wards the tip, where they have very long verticils. Thorax 

 grayish above, with three brown stripes ; the intermediate one 

 broad, bifid posteriorly ; pleurae, scutellum, and metathorax gray- 

 ish ; halteres pale ; coxae pale ; feet pale tawny, tips of the femora 

 infuscated ; those of the tibia3 and tarsi likewise ; spurs at the 

 tip of the tibite distinct, of moderate length. Abdomen brown, 

 with a sparse yellowish pubescence ; margins of the segments 

 and venter paler. Wings uniformly tinged with yellowish ; other- 

 wise hyaline, their surface shining ; a narrow, inconspicuous 

 brown cloud along the central cross-veins ; similar clouds at the 

 origin of the prjefurca, the marginal cross-vein, and the tip of the 

 auxiliary vein ; stigma pale. Subcostal cross-vein anterior to 

 the origin of the prsefurca by not more than one length of the 

 great cross- vein ; origin of the praefurca with a stump of a vein ; 

 the first submarginal cell is very little shorter than the second, its 

 petiole being very short, sometimes obsolete ; the anterior branch 

 of the second vein is arcuated at its basis, as usual ; otherwise, 

 the course of both branches of this vein and of the third vein is 

 straight; the discal cell is closed, and the second posterior cell 

 (in the only specimen in my possession) is petiolate. 



Uab. Massachusetts (Scudder) ; a single male. 



This species seems to be very like the European A. occulta 

 Meig. ; only the latter has an open discal cell, and its fourth 

 posterior cell is sessile. 



3. A. calcar 0. S. % and 9 •— ^chracea, thorace rufescente ; alis 

 unicoloribus ; celliila submarginalis prima secunda lougior ; tibiarura 

 calcaribus longiusculis. 



Ochraceous, thorax reddish ; wings unicolorous ; first snbmarginal cell 



