306 PERCY SLADEN TRUST EXPEDITION 



$. Head (PL 15, fig. 4). Frons dull, slightly narrowing from the vertex to the 

 antennae ; in side view it is seen to be bristly-haired ; the bristles on the eye-margins bend 

 backwards, those on the disc of the frons bend forwards, so that in profile the frons appears 

 to be covered with bristles crossing about at right angles. Upper eye-margins which 

 include the vertical and fronto-orbital bristles are bristly, slightly shining and rather short. 

 Face slightly silvery, widening rapidly from antennas to mouth. Jowls very evident, black- 

 haired. Eyes bare. 



Antennas : third joint black, slightly dusted, short, about twice as long as broad : 

 when looked at from in front the tip of the antenna does not reach the curved mouth 

 margin by about half the length of the third joint. Arista pale at base then black, micro- 

 scopically pubescent. 



The bristles are normal, the ocellars being stout. There is a prominent stout vibrissa 

 on each side of the mouth. 



Palpi retracted, brownish black. 



Fig. 2. Lonchcea vibrissij'er, n. sp., wing. 



Thorax. Shining black with normal bristles and stout bristly hairs extending nearly 

 up to the prescutellar bristles. Scutellum same colour as thorax. 



Wings (Fig. 2) brownish in tone with brown-yellow veins. Calypters pale with pale 

 borders and hairs. 



Halters black with stalks slightly paler in the middle. 



Legs all black except that the metatarsi and the next joint in the front and middle 

 legs and the next two joints in the hind legs are yellow. The front femora have the 

 inferior row of bristles longer than usual, forming a regular comb. Middle femora with 

 a stout ciliation below and the tibiae with no crown of spines. 



Abdomen similar to the last species but somewhat more truncate at the tip. 



$ with a wider frons, the ovipositor short and much flattened, with a pale sheath. 



Size a little over 3 mm. 



Localities. Seychelles. Silhouette : plateau of Mare aux Cochons, over 1000 ft., 

 IX. 1908. Mah£: Cascade Estate, about 1000 ft.; Morne Seyehellois, over 1500ft., 

 4. II. 1909. 



