RHINGIA. GRAPTOMYZA. 65 



Head black, with bluish reflexions, with sparse grey dust on the 

 occiput, some black hairs at the vertex, and whitish hairs on 

 the chin ; frons and face entirely bare ; eyes large, entirely brown, 

 in contact along a line which is double as long as the vertical 

 triangle, with the upper facets much larger than the others ; 

 antennae with the two basal joints blackish, the third yellow-brown, 

 oval, longer than broad, with a long arista, which is yellowish 

 towards the base ; face strongly shining, without any yellow 

 marking ; snout dullish black at the tip, with a dark yellow longi- 

 tudinal stripe on each side ; peristoma entirely blu'sh black. 

 Thorax entirely shining bluish, the humeral and postalar ealli 

 narrowly reddish ; the back is clothed with long erect black hair, 

 the pleura are grey-haired ; scutellum like the thorax, deeply 

 punctate, aeneous on the hind border, and there with some long 

 bristle-like hairs, clothed below with yellowish hair. Squamulse 

 dirty whitish, with a long fringe ; halteres dark yellowish. Abdo- 

 men entirely shining blue, the first segment only being dark reddish 

 in the middle below the scutellum ; second with hind border 

 broadly dull blackish blue towards the middle ; third similar, but 

 less distinct. The hairs on the abdomen are longer at the base 

 and dark externally, those on the back erect and pale, but those 

 on the dark portion of the second segment black. Legs, including 

 the coxae, black, the femora being very narrowly yellow at the 

 extreme tip ; the four anterior tibiae are pale yellow, the hind 

 tibiae darkened as in the middle and reddish at the tips ; fore tarsi 

 less darkened apically, hind tarsi more broadly so ; front tarsi with 

 a distinct basal stripe ; first joint of front and hind tarsi thickened. 

 Wings hyaline, wath a yellowish-brown tinge ; mediastinal cell 

 more yellow ; venation typical, but the third vein not so much bent 

 downwards at the end and therefore the submarginal cell not so 

 much dilated at the tip ; vena spuria not so strongly chitinised as 

 in the other species. 



Type rf , from Obuasi, Ashanti, 27. iv. 1907 (Dr. W. AT. 

 Graham), a single specimen. 



Subfamily II. VOLUCELLIN.E. 



Genus 10. GRAPTOMYZA, WieJemann (1820) 



Of this very peculiar genus five species only are known from the 

 Ethiopian Region one described by Karsch in 1887, two by Bigot 

 in 1882 and 1883, one of which he referred to a new genus called 

 Ptilostylomyia, and two by me in 1908. I have given a table for 

 the distinction of these species in my paper on Fea's SjTphidae ; 

 but I now think that there are only three distinct species, viz. 

 suai'issima, Karsch, very different from the others on account of 

 its blue abdomen ; vittiyera, Bigot, with its six bkck abdominal 

 stripes : and triangvlifera, Bigot, of which my melaniira and 



