HYDUELLIA. 257 



Mcq. ; Hal. ; Zctt. Firidi-cineren, svljdis scJiistacea, facie flavirnnte, 

 pmiclo frontali albmimo, tarsis posteriorUms basi pnlpisque ferrngineis, 

 alls hi/alinis, vena transversa perpendiculari. Loiipj. 1 ; alar. 2 lin. 



Greenish-grey , slate-colour beneath. Face yellowish. Vrontal dot 

 brilliant-white. Palpi ferruginous. Wings hyaline ; discal transverse 

 vein perpe)idlcular. Posterior tarsi ferruginous at the base. 



The most abundant species in meadows. Tlie distinct white 

 dot above the antennoe is rarely wanting. The palpi are usually 

 dusky at the base. The wings and legs are particularly long. 

 (E.I.) 



8. chrysostoma, Meig. Zw, vi. 67. 8 (1830); Hal.; Zaii.—viri- 

 descens, Dcsv. Nigro-olivacea, facie Jlavicaute, palpis ferrugineis, vena 

 transversa subobliqua. Long. 1 ; alar. 2 lin. 



Blackish olive-colour. Face yelloioish. Palpi ferruginous. Wings 

 with a slightly oblique transverse vein. 

 Not rare in marshes. (E. I.) 



9. tarsata, Hal. A. N. H. iii. 403. 9 (1839). Nigro-oliveacea, 

 facie palpisque Jlavis, femorihus anticis validis, tarsis iisdem subtus flavo- 



tomentosis, onychiis longiusculis rufescentihus. Long. 1^; alar. 2 lin. 



Blachish olive-colour. Face and palpi yellow. Fore femora stout. 

 Fore tarsi clothed beneath with yellow tomentum. Onychia reddish, 

 rather long. 



Distinguished particularly by its onychia ; those of the other 

 species being short and white in both sexes. Very rare; found 

 but once at Hollywood, near Belfast. In Mr. Haliday^s collec- 

 tion. (I.) 



10. albiceps, Meig. Zw. vi. 68. 11 (1830); Mcq.; Hal.— //%i- 

 nosa ? Desv. Nigro-anescens, facie alia, palpis ferrugineis, a I is obscuris, 

 halteribus basi nigris. Var. /3. Labellis ferrugineis, anteunarum articulo 

 tcrtio subtus vol etiani toto fulvo. Long. 1 ; alar. 2 lin. 



JEneous-blaclc. Face white. Palpi ferruginous. Wings dusky. Ilal- 

 tcres black at the base. Var. ^. LabcUa ferruginous. Antennte with the 

 thu'd johit beneath or even wholly tawny. 



Common in marshes. (E. 1.) 



11. erythrostoma, Meig. Zw. vi. 69. 14 (1830) ; Mcq. ; Hal.— 



JIavicornis, Stenli. ; Zett. Nigro-anescens, antennarum articulo tertio 

 facie palpisque fulvis, pun cto frontali albissinio, alis obscuris, halteribus 

 basi nigris. Var. /3. Puncto frontah flavicante, antennarum articulo 

 tertio fusco. Long. 1 ; alar. 2 lin. 



/Eneous-black. Frontal dot brilliant white. Face, palpi, and third 

 joint of the antenna tawny. Wings dusky. Haltercs black at the base. 

 Var. /3. Frontal dot yellowish. Third joint (f the antenncv, brown. 



Common on moist grassy slopes of mountains and in marshes. 

 (E. I.) 



VOL. II. 2 L 



