NO. 3578 DIPTERA — STONE 5 



p. 391) but with very different distimeres (harpagones) from the two 

 species of that couplet. 



Male: Head: Antenna black wdth 7 cyhndrical flagellomeres, the 

 first about as long as scape and pedicel combined, the others subquad- 

 rate except last, which is reduced in size, hemispherical. Rostrum 

 about equal to antenna in length, shorter than head and sharply 

 turned backward under head, reddish except near apex. Thorax 

 brownish pruinose, the notum dull reddish before scutellum and on 

 sides, the thi-ee narrow dorsal stripes somewhat grayish; a submedian 

 pair of raised, narrow, polished black stripes on median half of notum 

 and a pair of similar but broader stripes from just behind the antero- 

 lateral depression to corner of scutellum, often slightly reddish poste- 



Ventral 



Dorsal 



Lateral 



Figure 2. — Plecia porca, new species, male terminalia, ventral, dorsal, and lateral views 

 (D=distimere, S = sternum, T=tergum). 



riorly; scutellum and postnotum dull; anterior pronotum and upper 

 portion of sternopleuron mth hairs; hairs of mesonotal furrows very 

 small. Wing fumose, the stigma and costal cell darker; veins dark 

 wdth short fine hairs; vein R3 curved toward apex, shorter than basal 

 portion of radial sector; r-m crossvein about half way between medial 

 crossvein and fork of M. Halter, legs and abdomen nearly black. 

 Terminalia (fig. 2): Ninth tergum with a broad triangular emargina- 

 tion posteriorly with an inwardly turning pair of somewhat shiny pro- 

 tuberances in the median angle; a low protuberance medially near 

 base; ninth sternum slightly concave medially near apex -with a pair 

 of marginal ridges each ending in a slender submedian process; disti- 

 mere rather shiny black but covered with hairs except on the concave 

 dorsal surface; each distimere bilobed, the apico-median lobe with a 



