198 PERCY SLADEN TRUST EXPEDITION 



Mediastinal vein reaching costa almost at origin of preefurca, subcostal cross-vein close to 

 its tip ; first longitudinal vein sharply bent up to costa near its tip, marginal cross-vein 

 nearly in a line M^ith the bent portion, at about ^ the length of the submarginal cell ; 

 submarginal cell slightly expanded at apex, nearly twice as long as praefurca. Knob of 

 hal teres grey, stalk whitish ochreous. Abdomen fuscous. 



Length of body 4 '5 — 6 mm. 

 „ wing 5 — 7 mm. 



This species varies considerably in size and in the distinctness and amount of the 

 dark markings on the wings. It appears to come nearest to D. vicarians Schiner, 

 though there may be no real relationship. The two are certainly quite distinct. 



Loc. Seychelles. Mah(^ : Cascade Estate, 800—1500 ft., 9^, 7?; For^ Noire, 

 2 $ ; forest behind Trois Freres, 2000 ft., 1 ^, 1 ?. Also Africa : the following are in the 

 British Museum; Obuasi, Ashanti, 7. vi. 1907, 1 $ {Dr W. M. Graham); Mt. Chh-inda 

 (S. Ehodesia) 3000 ft., 31. v. 1911, 1 ?, and 12. vi. 1911, 1 ^, 1 ? (C. F. M. Swynnerton). 



2 a. Dicranomyia sp. 



A single immature specimen {$). It closely resembles D. seychellarum in neuration 

 and colouring, but the wings are entirely unspotted. There are also differences in the 

 genitalia. The absence of spots on the wings may be due to its immature state. 



Loc. Seychelles. Mahe : Cascade Estate, 800—1500 ft. 



3. Dicranomyia spadicithorax, sp. n. $. 



Fusca, thorace supra fusco-spadice, femoribus ad basin ochreis, alis marmoratis et 

 maculatis, antennarum articulis moniliformibus et maculatis. 



$. Head greyish, nearly globular; eyes, rostrum and neck black. Antennae 

 slightly longer than head and rostrum together, with the scape fuscous, first joint curved, 

 more than twice as long as second ; joints of flagellum moniliform, without any sign of 

 pectination, but rather broader than long, 3rd, 5th, 7th, 9th, 11th, 13th and 14th brown, 

 4th, 6th, 8th, 10th and 12th light ochreous. Rostrum somewhat produced, about as long 

 as the head. Neck rather long and narrow. Thorax with a large chocolate-brown patch 

 above, extending downwards to the level of the insertion of the wings, bordered by a fine 

 white line ; pleurae pale ochreous with three chocolate-brown longitudinal stripes : one 

 broad and median, the others narrow and interrupted, just below the base of the wings 

 and along the base of the coxae. Legs very dark brown, basal two-thirds of femora pale 

 ochreous ; middle tibiae paler brown in the middle. Wings pale ochreous, mottled over 

 the whole surface with light grey ; all the cross-veins more or less infuscated ; blackish 

 spots distributed as follows : one or two on the first longitudinal vein ; at the apex of the 

 mediastinal vein ; at the base of the praefurca ; at the apex of the praefurca (the largest 

 and most conspicuous) ; on the marginal cross-vein ; at the apex of the anterior branch of 

 the second longitudinal vein, of the discal cell and of the seventh longitudinal. Tip of 

 mediastinal vein a little beyond the origin of the praefurca, the subcostal cross-vein close 

 to this tip ; marginal cross-vein near the tip of the first longitudinal, which is bent 

 sharply up towards the costa at about f of the length of the wing ; second posterior cell 



