142 DIPTERA OF NORTH AMERICA. 



Synopsis of the Species. 



Division 1. — Middle of the face slightly convex without any elevation on it. 



, ( Thorax finely aciculate. 1 aciculata nov. sp. 



( Thorax polished. 2 



{Posterior part of the thorax and scutellum hronze-colored. 

 2 scoriacea nov. sp. 

 The whole "body pure black. 3 atra nov. sp. 



Division 2. — Middle of the face slightly convex with some flat longitudi- 

 nal impressions. 



, ( Abdomen black. 4 umbrosa nov. sp. 



( Abdomen steel-colored. 5 caeruleiventris nov. sp. 



1. P. aciculata Loew. 9- — Thorace scutelloque nigris, transverse 

 subtiliter aciculatis, capite abdomineque aut ex cupreo aut ex viridi 

 senescentibus, antennis flavis, pedibus nigris, tibiarum apice tarsisque 

 flavescentibus, basi alarum sublutescentium nigra. 



Thorax and scutellum black, transversely with fine scratches ; head and 

 abdomen either coppery or greenish brassy ; antenna) yellow ; legs black, 

 tips of the tibhe and tarsi yellowish ; the rather yellowish wings with 

 the base black. Long. corp. 0.09. Long. al. 0.1. 



Antenna) entirely reddish-yellow. Front and face shining, 

 either dull coppery or even almost metallic black, or metallic 

 green. The thorax and the proportionately large scutellum black, 

 hardly brassy, everywhere covered with close and exceedingly 

 fine scratches. Abdomen polished, shining, the color varying in 

 the same way as that of the face. Legs shining black, knees in- 

 distinctly yellowish-brown ; tips of all the tibiae yellowish as well 

 as all the tarsi ; last joint of the tarsi blackish at its tip only. 

 Poisers brownish-black. Wings rather clay-colored, blackish at 

 the base ; this blackening of the costal margin reaches a little be- 

 yond the middle of the first segment, on the disk of the wing only 

 as far as the basal transverse veins ; towards the posterior margin 

 it extends in such a way, as to occupy half of the corner of the 

 wing lying behind the fifth longitudinal vein, but it becomes at the 

 same time very pale. 



Hah Cuba. (Poey.) 



2. P. scoriacea Loew. 9* — Atra, nitida, colore in posteriore tho- 

 racis parte scoriaceo, in scutello obscure ameo, proboscide pedibusque 

 nigris, tarsis posticis fuscis, alis cinereo-hyalinis. 



Black, shining ; the posterior part of the thorax scoriaceous ; scutellum 



