254 MUSCID^. 



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

 puhescente, vena jJobracJdali non ahbreviata. Long. 1; alar. 2 lin. 



A minute species, 2vith 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, 

 alls 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 tubercnlata. Ocidi a peristomate distantes. Proboscis bigenicu- 



lata. Antenna articulo tertio orbiculato. Alee abdomen non superantes. 



Abdomen planum, siibdejiexum, ^-annidat%mi, venire toto coriaceo hand 



insecto. Tibia nisi apice nndce. 



Face tuberculate. Eyes remote from the peristoma. Proboscis with 

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

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

 four segments, loholly coriaceous and without sutures beneath. Tibics 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. \\ 

 lin. 



Whitish. Face with a black dot. Antennae, tibiae, 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. Antenna articido secundo exunguicidato. Ala exun- 

 guiculata. 

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



as if velvety. Antenna with the second joint exunguiculate. }f^ings ex- 



