254 MUSCIDjE. 



11. pulicaria, Hal. A. N. H. iii. 224 (1839). Nigra, scutello 

 pubescente, vena pobrachiali non abbreviata. Long. 1 ; alar. 2 lin. 



A minute species, with the wings scarcely exceeding the abdomen ; the 

 base of the costal vein more bristly, and the radial rather shorter than in 

 the others ; the pobrachial scarcely abbreviate. Arista with only four or 

 five hairs. Thorax and scutellum pubescent. Wings obscure hyaline. 

 Club of the halteres white. Extremity of the abdomen glossy. 



Not common ; mostly found on windows. (I.) 



12. glabra, Meig. Zw. vi. 69 (1830) ; Mcq. ; Hal. Nigra, nitida, 

 alis hyalinis, halteribus fuscis, tarsis basi flavis. Long. 1 ; alar. 2 lin. 



Black, shining. Wings hyaline. Halteres brown. Tarsi yellow at 

 the base. 



Not common. ' (E.) 



Subgenus 7. HECAMEDE. 



HECAMEDE, Hal. A. N. H. iii. 224 (1839). Notiphila p., Meig. ; Mcq. 



Fades tuberculata. Oculi a peristomate distantes. Proboscis bigenicu- 



lata. Antennae articulo tertio orbiculato. Ala abdomen non superantes. 



Abdomen planum, subdejlexum, k-annulatum, venire toto coriaceo haud 



insecto. Tibiae nisi apice nudes. 



Face tuberculate. Eyes remote from the peristoma. Proboscis with 

 two joints. Antennae with, the third joint orbiculate. Wings not extend- 

 ing beyond the abdomen. Abdomen level above, slightly deflexed, with 

 four segments, wholly coriaceous and without sutures beneath. Tibiae bare, 

 except at the tips. 



13. albicans, Meig. Zw. vi. 65. 3 (1830); Mcq.; Hal. Albida, 

 facie puncto nigro, antennis tibiis tarsisque flavis. Long, f ; alar. H 

 lin. 



Whitish. Face with a black dot. Antennae, tibia?, and tarsi yellow. 

 Wings white. 



On sandy coasts, especially on fresh marine rejectamenta ; runs 

 fast and does not fly readily. (E. I.) 



Genus III. HYDRELLIA. 



HYDRELLIA, Desv. E. M. (1830.) Notiphila p., Fal.; Meig. ; Zett. 

 Discocerina p., Mcq. Hydrina ? Desv. 



Caput oblatum. Mentum parum incrassatum. Oculi confertissime pilosi, 

 quasi velutini. Antennae articulo secundo exunguiculato. Alee exun- 

 guiculatce. 

 Head oblate. Mentum slightly thickened. Eyes very thickly pilose, 



as if velvety. Antennae with the second joint exunguiculate. Wings ex- 



