LAMB— DIPTERA : LONCH^ID^, SAPROMYZID^, EPHYDRID^, ETC. 323 



25. Psiloim longicornis, n. sp. 



This species is rather aberrant in the genus, but seems best placed there. It is an 

 elongate form with an exceptionally long third antennal joint. Most of the specimens 

 were rather worn, so that slight uncertainty arises in regard to the colours. 



Head (PI. 15, fig. 16). Frons and vertex greenish brassy with grey pollination, the 

 broad eye-margins more brassy but not truly shining : a well-marked straight lunular 

 suture crosses the frons just above the antenna and extends from one eye-margin to the 

 other. Below this the face is pollinated like the frons. The pollination is frequently rubbed 

 off, when the ground colour beneath is seen to be reddish bronze. Jowls silvery; prelabrum 

 often showing slightly, shiny, and horny in texture. Inside of mouth and the palpi 

 yellow; tongue stout and yellowish grey. 



The usual pair of fronto-orbital bristles inserted side by side, strong, the inner 

 pointing backwards the outer forwards; inner and outer verticals; very long ocellars ; 

 stout vibrissse, and the usual stout long bristle on the hind head just below the back of 

 the eye. 



Antennge blackish with yellow tone, the basal joints being somewhat silvery ; the 

 curved bristle on the second joint is fanly long but fine ; third joint very long, arista 

 long pectinate with eight side rays and one terminal. 



Fig. H. Psilopa longicornis, n. sp., wing. 



Thorax. Shining greenish with grey pollination ; a well-marked more brassy 

 central line, each side of this being well pollinated. The dusting is easily knocked off, 

 and many specimens were bare. One pair of dorso-central bristles, scutellum dusted like 

 the thorax, a pair of terminal bristles and the usual pair near the ba.se are especially long 

 and stout. 



Wings (Fig. 14); veins yellow. 



Halters, knob whitish and stalk yellow. 



Legs yellow with very slightly darkened femora. 



Abdomen, dark greenish black, slightly pollinated with the basal part of the dorsum 

 often yellowish in the centi'e ; the whole is covered with stout bristly hairs, longer 

 on the margins of the segments. 



Size about 2 mm. 



Localities. Seychelles. Mahe : marsh just behind beach at Port Glaud, 5. XI. 

 1908 ; marshes on coastal plain, Anse aux Pins and Ansa Royale, I. 11)09. 



