HYDRELLIA. 257 



Mcq. ; Hal.; Zett. Firidi-cinerea, subtus scfilstacea, facie flavicante^ 

 puncto frontali albmimo, tarsis posterioribus basi palpisque ferrngineis, 

 alls hyalinis, vena transversa perpendiculari. Long. 1 ; alar. 2 lin. 



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

 brilliant-white. Pal/pi ferruginous. Wrings hyaline ; discal transverse 

 vein perpendicular. Posterior tarsi ferruginous at the base. 



The most abundant species in meadows. The distinct white 

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

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



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

 descens, Desv. Nigro-olivacea, facie Jlavicante, palpis ferrugineis y vena 

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



Blackish olive-colour. Face yellowish. 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 fiavis, femoribus anticis validis, tarsis iisdem subtus favo- 

 tomentosis, onychiis longiusculis rufescentibus. Long, li ; alar. 2 lin. 



Blackish 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. Holiday's collec- 

 tion. (I.) 



10. albiceps, Meig. Zw. vi. 68. 11 (1830); Mcq.; ftz\.fuligi- 

 nosa ? Desv. Nigro-cenescens, facie alba, palpis ferrugineis, alis obscuris, 

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

 tertio subtus vel etiam toto fulvo. Long. 1 ; alar. 2 lin. 



JEneous-black. Face white. Palpi ferruginous. Wings dusky. Hal- 

 ter -es black at the base. Var. /3. Labella ferruginous. Antenna with the 

 third joint beneath or even wholly tawny. 



Common in marshes. (E. I.) 



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

 favicornis, Stenh. ; Zett. Nigro-cenescens, antennarum articulo tertio 

 facie palpisque fulvis, puncto frontali albissimo, alis obscuris, halteribus 

 basi nigris. Var. 0. Puncto frontali flavicante, antenuarum articulo 

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



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

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

 Var. /. Frontal dot yellowish. Third joint of the antenna brown. 



Common on moist grassy slopes of mountains and in marshes 

 (E. I.) 



VOL. II. 2 L 



