TETRAGONEURA. 45 



differences in the wing-veins. In Sciopfdla the head is almost 

 conical ; the eyes are not quite circular, generally almost reniform ; 

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

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

 In Tetragoneura 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 autenuse are cylindrical. 



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

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

 secundo jiavis, thorace nigro-cinereo, alis hyalinis, vena subcostali in 

 radiali exeunte ante areolam, furca venae pobrachialis prope basim ales, 

 coxis femoribusque albo-flavis, tibiis tarsisque fuscis ; Mas, abdomine 

 nigro nitido, segmentis basalibus subtus flavis; Fcem. abdomine flavo, 

 vitta dorsali fasciisque nigris. Long. \% ; alar. 3 lin. 



Male and Fern. Black, clothed with whitish hairs. Proboscis and 

 palpi yellow. First and second joints of the antennae yellow. Thorax 

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

 costal, radial, and cubital veins brown, the rest nearly colourless; 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, almost 

 longer than the 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 coxse 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. 

 Fern. 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 Mr. Hali- 

 day's collection. (I.) 



2. sylvatica, Curt.! B. E. xiv. pi. 641 (1837); distincta, Winn. 

 Nigra, proboscide, palpis et antennarum articulo secundo flavis, thorace 

 nigro-cinereo, alis hyalinis, furca venae pobrachialis prope medium aloe, 

 vena subcostali obsoleta, coxis femoribusque albo-flavis, tibiis tarsisque 

 fuscis ; Mas, abdomine nigro nitido, segmentis basalibus subtus flavis ; 

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



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

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

 bristles. Wings obscurely hyaline ; veins towards the costa brownish- 

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

 the prsebrachial vein opposite to the praBbrachial 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 



