200 PERCY SLADEN TRUST EXPEDITION 



This species is very close to T. auripennis, from Sydney, N.S.W. The chief 

 difterences may be tabulated as follows (the characters of T. auripennis are drawn from 

 2 specimens in the British Museum) : 



T. seycheUeneis. T. auripeniiis. 



Tliorax rufescent ochieous. Thorax light ochreous brown. 



Apical I or more of metatarsus white. Half of metatarsus white. 



Apical tarsal joints light brown. Apical tarsal joints white. 



Tip of mediastinal vein usually beyond origin of Tip of mediastinal vein opposite origin of praefurca. 



prsefurca. 



Stigma shorter. Stigma longer. 



Supernumerary cross-vein preceding marginal by a Supernumerary cross-vein preceding marginal by a 



distance usually not much greater than its own distance several times its own length. 



length. 



Halteres shorter. Halteres longer. 



I have seen two species from Ceylon, which though they do not invalidate the genus 

 differ in several respects from both T. seychellensis and 7'. auripennis [vide Ann. Mag. 

 Nat. Hist., (8) viii. 1911, p. 58). Brunetti (Rec. Ind. Mus., vol. vi. p. 270) considers that 

 Thry2:>ticomyia is untenable. Admittedly it stands very close to Dicranomyia. 



Loc. Seychelles. Found in shady places in the mountain-forests ; a number of 

 specimens often hang by their front tarsi in rows, suspended from threads of webs 

 stretched between bushes etc. (See Scott's introductory paper, vol. XIV. of these 

 Transactions, p. 32.) Mahe : Cascade Estate, 800 — 1500 ft., 14^, 13?; Morne Seychel- 

 lois, over 1500 ft., 1^; Morne Blanc, 1?; above Port Glaud, 500—1000 ft., 1^. 

 Silhouette : near Mont Pot-a-eau, 1500 ft., 8^, 6 ?. 



Genus Geranomyia Haliday, Ent. Mag., i. 154 (1833). 



Subgenus Monophana, n. Palpi uniarticulati. Venula transversa subcostalis ab apice 

 venas auxiliaris remota ; vena longitudinalis pi-ima ad costam non attingens. 



5. Geranomyia (Monophana) immaculata, sp. n. (Plate 10, fig. 4, wing.) 



Rufescens, pedibus testaeeis, alls immaculatis, venis ochreis. 



%. Head with collar and rostrum black, eyes outlined with whitish, antennae dark 

 brown, joints of flagellum about as long as broad, rostrum shorter than thorax. Thorax 

 reddish ochreous with a darker central stripe above. Legs testaceous, trochanters with 

 minute black dots, femora somewhat darker at tip. Wings hyaline, stigma absent, veins 

 ochreous. Mediastinal vein reaching costa at origin of praefurca, subcostal cross-vein 

 placed far before the tip, a distance greater than the length of the praefurca ; first 

 longitudinal vein not reaching costa, marginal cross-vein at its tip ; submarginal cell 

 2^ times the length of the praefurca, slightly contracted at apex. Halteres reddish 

 ochreous. Abdomen fuscous. 



This species has a facies quite unlike that of the European Geranomyia, though it 

 must be included in that genus at present. 



