356 DURHAM DIPTERA. 



XLIX. 613. 



612. Ephydra, Fin. 



1 (2). Third antennal joint without any long erect bristle in 



addition to the arista. 



(2638. riparia, Fln.=2639. halophila, v. Heyd.) 



2 (1). Third antennal joint, in addition to the usual arista, 



with a single erect bristle. 



3 (4). Costa black; arching of the face widest about or 



under the middle when seen in profile. 



(2640. micans, Hal.) 



4 (3). Costa yellowish brown ; the arching of the face widest 



considerably above the middle when seen in 

 profile. 



5 (6). The last abdominal segment in the male shorter than 



the one before ; mouth bristles weak. 



(2641. breviventris, Lw.) 



6 (5). The last abdominal segment in the male fully twice 



as long as the one before ; mouth bristles strong in 

 the female. {salince, Ztt.) 



614. Cenia, Dsv. 



1 (2). Third antennal joint almost conical ; wings dark with 



nine clear spots. (2643. defecta, Hal.) 



2 (1). Third antennal joint obtuse. 



3 (6). Halteres and wings brownish ; size, 2 mm. ; head and 



legs black. 



4 (5). Abdomen unicolorous. (2645. p^lustrts, Fin.) 



5 (4). Abdomen with greyish green bands, (fumosa, Stnh.) 



6 (3). Halteres white ; wings clear. 



7 (8). Small species, i£ mm. ; face yellow ; legs grey. 



(2644. obscura, Mg.) 



8 (7). Large species, 3 mm. ; face grey ; abdomen greenish ; 



edges of segment dark. (2646. albula, Mg.) 



615. SCATELLA, DSV. 



1 (2) (3). Wings brown spotted. (2647. quadrata, Fin.) 



2 (1) (3). Wings unspotted. (2648. sibilans, Hal.) 



3 (1) (2). Wings grey with about five clear drop-like spots. 



