156 MUSCID^E. 



Genus III. CCELOPA. 

 CffiLOPA, Meig. Zw. vi. 8 (1830) ; Mcq. ; Zett. ; Hal. 



Corpus depressum, coriaceum, sat angustum, setosum vel pilosum. Caput 

 parvum,fere rotundum, thorace multo angustius. Facies subobliqua. 

 Oculi parvi, oblongi. Antennas brevissimce ; articulus tertiusfere ro- 

 tundus, secundo non kngior. Thorax elongato-subquadratus, antice 

 angustior. Alas subangustse. Abdomen ellipticum vel obconicum. 

 Pedes valid! ; tibiae subcurvata?. 



Body flat, coriaceous, rather narrow, more or less bristly or hairy. 

 Head small, marly round, much narrower than the thorax ; front and 

 epistoma rather prominent ; face slightly oblique. Eyes small, oblong. 

 Proboscis and palpi short. Antennae very short ; third joint nearly 

 round, not longer than the second ; sixth long, slender, bare or pubes- 

 cent. Thorax flat, elongate-subquadrate, narrower in front. Wings 

 rather narrow ; costal vein ending on the hind border near the tip of 

 the wing ; subcostal ending at beyond one-third of the length ; medi- 

 astinal ending beyond half the length ; radial ending at five-sixths of 

 the length; cubital and praebrachial slightly diverging between the 

 transverse veins, almost parallel from the discal transverse to the bor- 

 der ; discal transverse vein straight, upright, parted by more than twice 

 its length from the praebrachial transverse, and by nearly its length 

 from the border. Abdomen flat, elliptical or obconical, a little longer 

 than the thorax. Legs stout, bristly or hairy ; tibia3 slightly curved. 



These flies inhabit marine rejectamenta, and their flat bodies 

 and tough coriaceous skins enable them to creep without injury 

 among the loose stones and tangled seaweeds. 



1. frigida, F. S. A. 307. 116(1805); Fal.; Hal.; Zett. ff ravis, 

 Hal. E. M. Nigro-picea, antennis ferrugineis, alis limpidis, abdo- 

 minis lateribusfulvo-maculatis, segmentis fulvo-marginatis, pedibus fulvis 

 setosis. Long. 3-3^; alar. 6-7 Hn. 



Piceous-black, dull. Proboscis and antennce ferruginous. Wings lim- 

 pid. Halteres testaceous. Abdominal segments tawny along the hind 

 border, and with a tawny spot on each side. Legs tawny, very bristly. 



Generally distributed. (E. S. I.) 



2. pilipes, Hal. A. N. H. ii. 186. 1 (1838). frigida, Meig.; 

 Mcq. Nigro-picea, antennis piceis basi rufescentidm, alis subcinereis, 

 pedibus ferrugineis pilosis. Long. 2-2^; alar. 4-5 lin. 



Piceous-black, dull. Proboscis testaceous. Antenna piceous ; first 

 and second joints reddish. Wings slightly grey. Halteres testaceous. 

 Legs ferruginous, very thickly clothed with hairs. 



Generally distributed. (E. S. I.) 



C. frigida belongs to the submenus Fucomyia, Hal., and the 



