Genus Cacomyia. 555 



and white lateral spots. Legs unhanded, deep brown ; femora 

 white beneath. Wings with violet reflections, iridescent. 



J . Head clothed with flat metallic violet scales, except a 

 patch between the eyes, which are white, and at the sides, where 

 they are grey and black ; black bristles project over the eyes, 

 and there is a trace of a narrow pale border surrounding them ; 

 clypeus with a frosty sheen ; palpi black ; proboscis black, curved 

 upwards, nearly as long as the whole body ; antennae pale brown, 

 basal segments deep brown, with dusky scales on the large basal 

 and second segments. 



Thorax black, covered with large flat apple-green metallic 

 scales, rounded at their apices and irregularly disposed over the 

 mesonotum ; a patch of almost silvery-white ones just in front of 

 the roots of the wings, with also long dense black bristles ; 

 scutellum with flat green and blue scales and black border- 

 bristles ; prothoracic lobes and pleurae silvery white. 



Abdomen rich metallic violet, the first segment with an 

 oblique white line on each side ; the second and third unadorned, 

 the fourth with a few large basal white scales ; the fifth, sixth 

 and seventh segments with basal white bands ; border-bristles 

 short and black ; each segment has a large basal silvery white 

 lateral spot, venter pure silvery white ; each segment with a 

 median black spot ; the last two segments project downwards 

 and give the appearance of two ventral black tufts. 



Legs unhanded, deep brown, with metallic violet reflections, 

 and a pale knee spot to the mid and hind pair ; femora white 

 beneath ; ungues small, equal and simple. 



Wings faintly tinged with brown, metallic violet and 

 iridescent in certain lights ; first sub-marginal cell slightly 

 longer and narrower than the second posterior cell, its base 

 nearer the apex of the wing, its stem longer than the cell ; stem 

 of the second posterior cell longer than the cell ; posterior cross- 

 vein rather more than its own length distant from the mid cross- 

 vein. 



Halteres with ochraceous stem and fuscous knob. 



Length. — 4 to 5 mm. 



Habitat, — Kingston, Jamaica (Dr. Grabham). 



Time of capture. — August (24th). 



Observations. — Described from a single perfect specimen. Dr. 

 Clrabham took this brilliant species feeding on a horse. He 

 captured two specimens, and mentions that "it is by far the 

 most brilliant species found here, and is evidently uncommon." 



