252 MUSCID^K. 



Corpus depressum. Fades latissima, rugosa. Alee abdomen superantes, 

 postice decurva. Abdomen k-annulatum, orbiculatum, planum, subde- 

 fiexum. Tibia intermedia nisi apice nudes. 



Body depressed. Face rugose, very broad. Wings not extending be- 

 yond the abdomen, decurved behind. Abdomen orbiculate, flat, slightly 

 defiexed, with four segments. Middle tibia bare, except at the tips. 



5. incurva, Fal. Act. Holm. 1813. 249. Hydr. 8. 6. 1 (1813); 

 Meig. ! Zw. vi. pi. 58. f. 14-17 ; Mcq. ; Hal. ; Zett. Nigra, antennis 

 tarsisque posterioribus luteis. Long. 1 ; alar. 2 lin. 



Black. Antennae and posterior tarsi luteous. Wings blackish. 



Pound in September on the wooded cliffs about Ish-oronsay, in 

 Skye; runs swiftly, but scarcely flies. (E.I.) 



Subgenus 4. TRIMERINA. 



TRIMERINA, Mcq. D. ii. 529 (1835) ; Hal. Psilopa p., Fal. Act. Holm. ; 

 Meig. ; Zett. Psilopa, Fal. Hydr. 



Fades perpendicularis. Antenna articulo tertio oblongo. Ala plana, 

 abdomen non superantes. Abdomen marginatum, quasi -annulalum, 

 i. e. segmentis primo et quinto minimis, tribus intermediis magnis. Tibia 

 intermedia nisi apice inermes. 



Face vertical. Antenna with the third joint oblong. Wings fiat, not 

 extending beyond the abdomen. Abdomen with a margin apparently with 

 three segments, that is, with the first and fifth segments very small, the 

 other three large. Middle tibia bare, except at the tips. 



6. madizans, Fal. Act. Holm. 1813. 7. 2. 252 (1813); Meig.; 

 Mcq. ; Hal. Nigricans, submetallica, antennis femoribus anticis pedi- 

 busque posterioribus runs. Long. 1 ; alar. If lin. 



Blackish, slightly metallic. Antennas, fore femora, and hinder legs 

 luteous. 



Not uncommon on grassy banks, running actively and flying 

 little. (E. I.) 



Subgenus 5. HYGIIELLA. 



HYGRELLA, Hal. A. N. H. iii. 223 (1839). Notiphila p., Fal. ; Meig. 

 Psilopa p., Fal. ; Zett. Hydrellia p., Mcq. Keratocera p. ? Desv. 



Fades perpendicularis, lateribus dliata. Antenna articulo tertio oblongo 

 dejlexo. Ala abdomen superantes. Abdomen immarginatum, segmentis 

 quinque subaqualibus. Tibia intermedia nisi apice nuda. 

 Face vertical, ciliated on each side. Antenna with the third joint ob- 

 long, deflexed. Wings extending beyond the abdomen. Abdomen without 

 a margin, having five almost equal segments. Middle tibia bare, except 

 at the tips. 



