RHIXGTA. 51 



6 (3) Abdomen metallic blue, more or less yellow 



towards the base ; scutelluui and thorax 

 of a metallic-blue colour. 



7 (10) Snout reddish yellow ; second abdominal 



segment more or less yellow, third with 

 a dull black or bluish hind border. 



8 (9) Legs entirely pale yellow ; species of 



smaller size' carulescens, Loew. 



9 (8) Legs strongly infuscated ; species of larger 



size \&i\fuscii>es, var. n. 



10 (7) Snout shining blue, like the rest of the 

 body ; only the first abdominal segment 

 yellowish towards the in id die, third with- 

 out dark hind border pycnosoma, sp. n. 



4-j. Rhingia lutea, sp. n. 



$ . Length of body 11 mm. 



A wholly luteous species, distinct from the allied mecyana, 

 Speiser, in having the frons and the snout entirely yellow, and the 

 black hind border of the abdominal segments narrower. 



Head reddish yellow, the sides of the occiput blackish, with dark 

 grey dust : frons shining, clothed with very short dark hairs placed 

 on small dark punctures, and with an ill-defined dusted band before 

 the supra -antennal tubercle, which is rounded, prominent, and 

 bare; face shining, with a reddish middle keel continued on the 

 snout, which is long and dull reddish, without any brown marking; 

 peristoma yellowish, whitish and white-haired behind ; proboscis 

 black, as long as the snout ; antennae orange-coloured, with the 

 basal joints very short and the third longer than broad and some- 

 what pointed at the tip ; arista bare, long, brown, broadly reddish 

 towards the base ; occiput with some erect dark hairs at vertex, 

 but without any fringe on the sides. Thorax reddish, punctate, 

 with very short dark hail's on the punctures ; pleurae with greyish 

 tomentum and almost bare ; a blackish spot on the breast over the 

 hind coxae ; seen from behind the thorax shows in the middle 

 two ill-defined, broad and parallel, whitish stripes. Scutellum very 

 broad, semicircular, yellow, punctate, with short black hairs, the 

 punctures and the hairs being more developed along the hind margin, 

 which therefore appears minutely serrulate ; below in the middle 

 it is clothed with erect soft white pubescence. Squamulae- yel- 

 lowish, with a very long fringe of dark yellowish feathered hairs. 

 Halteres yellowish. Abdomen broad and rounded, less punctate 

 and more glittering than the thorax, the first two segments pale 

 yellowish, the others reddish like the thorax ; first segment with 

 a very small black line behind, i.tit>adiy interrupted in the middle 

 and not reaching the sides ; second segment with n black hind 

 border, which is narrowed but not interrupted in the mi Idle ; third, 

 fourth, and fifth with a slightly broader black hind border. The 

 hair on the abdomen is very short and dark, only on the sides at 

 base longer and yellowish. Venter yellow, with black hind borders 

 on the sides of third and middle of fourth segments. Legs with the 



