LAMB— DIPTERA : LONCH^ID^, SAPROMYZID^, EPHYDRID^, ETC. 311 



Mah^ : marshes on coastal plain, Anse aux Pins and Anse Royale, I. 1909 ; Long 

 Island, VIL 1908 ; Anonyme Island, I. 1909 ; Mare aux Cochons district, 1000—2000 ft., 

 one specimen, I. — II. 1909. All the specimens except two (indicated above) are from 

 near the coast. 



9. Sapromyza mahensis, n. sp. 



This species is very closely allied to the preceding with which it is compared. 



Head. Form very like last : antennae all pale yellow ; third joint slightly larger ; 

 arista differs as follows : in S. fimehricornis the top rays are long at base and diminish to 

 the tip, the lower rays are finer and shorter at the base than at the apex so that the 

 upper and lower rays are of about equal length for the distal two-thirds of the arista: 

 in S. mahensis the rays are finer, more distant and on the top are of equal length for 

 about the first two-thirds of the arista ; below they are nearly as long as above, fine 

 and also equally long for the first two-thirds of the arista. The venation (Fig. 5) differs 

 slightly as will be seen from Figs. 4 and 5. 



The bunches of hairs on the stei-no-pleurae and coxae are less stout. The whole 

 insect is more shining and of a clearer yellow colour. 



In a few specimens the male genitalia are extruded (PI. 15, figs. 9, 10). These 

 have a median lobe hooked at each side and notched in the middle, two side hooked 

 appendages and a little fleshy hump covered with hairs. In most specimens this is 

 retracted, when the insect has a somewhat swollen knobby hypopygium. 



Size as last species. 



Localities. Seychelles. Mahe : Long Island, VII. 1908; Anonyme Island, from 

 grass, etc., I. 1909; marshes on coastal plain, Anse aux Pins and Anse Royale, I. 1909; 

 cultivated country near sea-level at Cascade, II. 1909. 



10. Saj^romyza nudiuscida, n. sp. 



Head (PI. 15, fig. ll). Frons and face entirely the same dull bright yellow: clypeus 

 visible in front : mouth margin slightly but sharply produced as seen in profile. Antennae 

 bright yellow, third joint shortish oval, arista brownish but jsale at the base and very 

 finely pubescent. 



Palpi yellow, narrow, with a few fine hairs. 



Bristles less strong than the last two species. 



Thorax. Dorsum yellow to brownish yellow covered with fine black bristles [l+'l) 

 dorso-centrals : achrosticals in four regular rows with no irregular bordering ones. 

 Chsetotaxy quite normal with smaller and less stout bristles than tlie preceding two 

 species. Scutellum distinctly flattened on the disc. 



Wings narrower but with venation like S. mahensis, barely tinged with yellow ; 

 veins pale. 



Halters yellow. 



Legs all yellow. Front femora witli the usual two rows of bristles behind both very 

 long ; the upper row has six to seven bristles and extends from base to tip of femur, the 

 SECOND SERIES— ZOOLOGY, VOL. XV. 40 



