TETRAGONEURA. 45 



differences in the wing-veins. In 8cwph%la the head is ahnost 

 conical ; the ej-es are not quite circular, generally almost rcniform ; 

 the ocelli form a very minute triangle, the middle one is very 

 small, and the joints of the antennse are somewhat compressed. 

 In Teiragoneura the head is round, flat above ; the eyes are circular ; 

 the ocelli are of nearly equal size, and are disposed in a curved 

 line; and the joints of the antennre are cylindrical. 



1. hirta, Winn. Ent. Zeit. Stett. vii. 19 (1846). — clisdmiUs, Zett. 

 Mas et Fcem. nigra, proboscide, palpis et antennnrum articulis primo et 

 seciDido Jlavis, tliorace nigro-cinerco, alis liyalinis, vena siibcostali in 

 radiali exeunte ante areolaiu, fiirca vence pohraclilalis prope basim alee, 

 coxis femoribnsque albo-fiavis, tibiis tarsisque fuscis ; Mas, abdomine 

 uigro nitido, segtuentis basahbns subtus flavis ; To;m. abdomine ilavo, 

 vitta dorsali fasciisque nigris. Long. \\; alar. 3 hn. 



Male and 'Fern. Black, clotlicd with whitish liairs. Proboscis and 

 palpi yellow. Yirst and second joints of the antennce yellow. Thorax 

 blackish-grey, beset with long whitish-yellow bristles. Wings hyahne ; 

 costal, radial, and cubital veins brown, the rest nearly colom'less ; sub- 

 costal vein ending in the radial before its middle, at a distance before 

 the areolet equal to the length of the latter ; areolet oblong, ahnost 

 longer than tlie last segment (following it) of the radial vein ; fork of 

 the prsebrachial vein opposite the transverse cubital vein, or the apex 

 of the areolet ; fork of the pobrachial retracted almost to the base of 

 the wing. Halteres white. Coxse and femora whitish-yellow ; second 

 joint of the coxai and hind femora with black tips, the latter with a 

 black streak at the base on the under side ; tibiae and tarsi brown. 

 Male. Abdomen black, shining, clothed with whitish-yellow hairs ; first 

 and second, and occasionally the third of the ventral segments yellow. 

 Tem. Abdomen yellow ; segments with a black dorsal stripe and black 

 bands ; sixth and seventh segments wholly black. 



Very rare. Has been found in Down, Ireland. In j\Ir. Hali- 

 day's collection. (I.) 



2. sylvatica, Curt.! B. E. xiv. pi. 641 {\%?>l);—distincta,'\T\mx. 

 Nigra, ])robosci(lc, palpis et antennaruni articulo secundo Jlavis, thorace 

 nigro-cinereo, alis hyaliuis, /area vena; pobruchialis prope medium alee, 

 vena siibcostali obsoleta, coxis femoribnsque albo-flavis, tibiis tarsisque 

 fuscis ; Mas, abdomine nigTO nitido, segraentis basalibus subtus flavis ; 

 Fcem. abdomine nigro, ventre flavo. Long. 1 ^ ; alar. 3 lin. 



Male and Fern. Black. Proboscis, palpi, and second joint of the 

 antennee yellow. Thorax blackish-grey, beset with long whitish-yellow 

 bristles. Wings obscurely hyaline ; veins tow\ards the costa brownish- 

 ferruginous ; subcostal vein obsolete ; areolet minute, oblong ; fork of 

 the pra^jrachial vein opposite to the prajbrachial median transverse 

 vein, or to the base of the areolet ; fork of the pobrachial rather nearer 

 to the base of the wing ; its anterior branch equal to the common 



