318 PERCY SLADEN TRUST EXPEDITION 



Hecamede, Haliday. 



Hecamede Haliday, Ann. Mag. Nat. Hist., ser. 1, iii. (1839), p. 224. 



18. Hecamede lacteipennis, n. sp. 



This is a very distinct and brightly-coloured species. 



Head (PI. 15, fig. 15). Frons with a large grey triangle extending to the lunula, 

 eye-margin grey, the rest of frons orange-yellow : this colour thus forms two triangles 

 pointing backwards from the front margin : the lunula is whiter. The bristles are as 

 follows : inner and outer verticals, a pair of bristles just behind the line joining the hind 

 ocelli, two other pairs near the margin of the triangle, the pair nearer the back of the head 

 being about half-way down the triangle, the other pair half-way between the former pair 

 and the point of the triangle ; in addition the triangle has some dozen bristly hairs 

 of which two form a distinct pair just at the tip of the frontal triangle. There are two 

 pairs of fronto-orbital bristles, the front pair bent forwards, the other backwards. The 

 face is silvery white with a distinct suture running up each side to meet the margins 

 of the lunula : just along the side of this suture is a row of three vibrissa?, the 

 top ones standing on a very small hillock ; the facial knob is small, shining and very 

 prominent. 



Fig. 9. Hecamede lacteipennis, n. sp., wing. 



The jowls are shining silvery and have only one or two fine bristles instead of the 

 many bristles of H. albicans ; the tongue is reddish-yellow with its bent tip only about 

 half the length of that of the latter species. The palpi are pale yellow. 



Antennae as in H. albicans, with pale yellow second joint and slightly darkened third 

 joint ; arista short with four side and one terminal rays. 



Thorax. Similar in form to H. albicans but is pale grey in colour like the 

 abdomen of that species ; its surface and that of the concolorous scutellum is uniformly 

 covered with short stout bristly hairs ; chsetotaxy normal including the six scutellar 

 bristles. 



Wings as Fig. 9, white, with perfectly pale veins. 



Halters yellow. 



Legs yellow except the femora which are rather dark silvery grey ; the last tarsal 

 joint somewhat suffused. 



