182 MUSCID^. 



the antennae, so that the head is nearly triangular above. Front thickly 

 set with bristles, its fore border piceous. Palpi reddish. Thorax and 

 scutellum often dull rust-brown. Scutellum elongate, with several 

 bristles at the sides and a few on the disc. Wings brotvnish ; veins 

 dusky, nearly as in L. limosa. Halteres yelloicish, dusky at the base. 

 Abdomen opaque, black. Legs hairy, pitcJiy-brown ; middle legs veiy 

 thickly armed with spines or bristles ; second joint of hind tarsi not 

 thickened. 



Inhabits seaweeds on the shore. (E. I.) 



17. vagans, Hal. E. M. i. 178 (1834). Nigra, opaca, alis infn- 

 matis, iMlteribus flavldis. Long. 1 ; alar. 2 lin. 



Dull-black. Eyes small. Arista finely and thickly pubescent. Scu- 

 tellum as long as the metathorax. Wings and veins brownish-yellow ; 

 costal more dusky, rather thick, bristly at the base ; radial extending 

 over two-thirds of the interval between the subcostal and the cubital ; 

 discal transverse parted by more than its length from the prajbrachial 

 transverse. Halteres yellowish. Legs dusky, pubescent ; fore coxa3 

 and knees, and middle tarsi, and sometimes the legs, entirely rust- 

 brown ; middle tibia3 with numerous bristles ; second joint of the hind 

 tarsi not thickened, twice as long as the first. 



Not rare. Inhabits seaweed. (E. I.) 



18. lugubris, Hal. E. M. iii. 332. 18 (1836). Nigra, pubeacens, 

 alis denigratis, halteribusfuscis. Long. ^ ; alar. \^ lin. 



Beep black. Face flceous. Eyes larger than of L. vagans. Scutel- 

 lum shorter. Wings blackish ; base of the costal vein less bristly ; radial 

 ending half-way between the subcostal and the cubital ; transverse veins 

 not so distant. Middle tibiae and tarsi dusky; middle tibiae with fewer 

 bristles ; second joint of the hind tarsi shorter. 



Common. (E. I.) 



19. Zosterse, Hal. E. M. i. 178 (1834). Nigra, opaca, alls infu- 

 matis. Long. 1^- ; alar. 3 lin. 



Opaque-black. Front gibbous, bristly. Face much elevated between 

 the antennae. Second joint of the antennjE very bristly, larger than 

 the third ; arista with thick whitish pubescence. Thorax scarcely pu- 

 bescent, very flat, with an impressed line down the middle. Scutellum 

 not so long as the metathorax. Wings and veins broiomsh-yellow ; 

 costal more dusky, rather thick, bristly at the base ; radial extending 

 little more than half-way between the subcostal and the cubital ; discal 

 transverse parted by much more than its length from the praibrachial 

 transverse. Halteres with a deep brown knob. Legs piceous, rather 

 short, thinly hairy ; knees and tarsi tawny ; middle tibia; with nume- 

 rous bristles ; second joint of hind tarsi not very long, scarcely thick- 

 ened. Var. Legs tawny. 



Common on seaweed. (E. I.) 



