BITTxVCOMORPHA. 313 



Description of the species. 



1. P. rufocincta 0. S. % and 9 • — Nigra, antennre, basi except^,, 

 nigrse ; epistouia fulvuin ; pedes fulvi ; abdomen nigrum, fasciis ferru- 

 gineis ; alis maciila basali et fasciis tribus fuscis. 



Black, antennae, except the basis, black; epistoma fulvous, feet fulvous; 

 abdomen black, with ferruginous bands ; wings with a brown basal spot 

 and three brown bands. Long. corp. 0.28 — 0.32. 



Syn. Ptychoptera rufocincta 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 252. 



Head black, shining, proboscis and epistoma reddisli-yellow ; 

 basal joints of the antennte brownish; flagellum black. Thorax 

 black, less shining than the head ; pleurte reddish-yellow ; a 

 silvery reflection is sometimes perceptible upon them ; halteres 

 pale, somewhat dingy ; feet reddish-yellow ; tips of the femora, 

 of the tibiae, and the larger part of the tarsi brown ; the first joint 

 of the posterior tarsi yellowish. Abdomen black, with ferruginous 

 bands, which occupy the anterior portion of the segments ; the 

 last segments, including the forceps and the ovipositor, are reddish- 

 yellow ; the venter is yellowish. Wings with a brown spot at 

 the basis, an abbreviated pale brown band across tlie middle of 

 the two basal cells ; another band along the central cross-veins, 

 reaching the fifth longitudinal vein ; a third band, consisting 

 sometimes of two unconnected spots at the inner end of the two 

 forks, in the apical portion of the wing ; the interval between the 

 costa and the first vein is more or less brownish. These bands, 

 especially the last, are sometimes very weakly marked. Prcefurca 

 very short, arcuated ; first submarginal cell sessile or nearly so. 



Hah. United States, not rare. Pennsylvania ; Washington, 

 D. C. ; Dobb's Ferry, N. Y. ; Virginia (Dr. Wilson) ; Quebec 

 (Couper) ; Illinois (LeBaron) ; White Mountains, N. H., etc. 



Gen. XLV. BITTACOMORPHA. 



Two submarginal cells, the first much longer than the second ; no sub- 

 costal cross-vein ; no discal cell ; three posterior cells, the inner ends of 

 which are nearly in one line ; only a single longitudinal vein after the 

 fifth vein (Tab. II, fig. 20). Antennse 20-jointed. Tibiae with small spurs 

 at the tip ; first joint of the tarsi very much incrassated ; empodia distinct. 

 Thoracic suture deeply sinuate. Abdomen slender, very elongated, with 

 a forceps consisting of four coriaceous, digitiform, somewhat curved 

 appendages (Tab. IV, fig. 31, 31 a). 



Head rather large, transverse, applied to the thora.x with a 



