LIST OF DIPTERA. 601 



Merodon umbrifer, n. s. mas. Fuscus, scutelli rnargine postico ful- 

 vo, abdominis apice antennisque piceis, pedibus ferrugineis, 

 femoribus tibiisque posticis piceis, alis cinereis basi fulvis disco 

 fuscis. 



Body brown, covered with tawny down : mouth black : feelers 

 pitchy, seated on a protuberance ; third joint truncate ; bristle taw- 

 ny, darker towards the tip : eyes bronzed ; facets on the fore part of 

 the crown rather larger than those elsewhere: hind border of 

 the scutcheon pale tawny : abdomen obconical, broader, but hardly 

 longer than the chest, pitchy towards the tip : legs ferruginous, 

 partly pitchy, clothed with short tawny and black hairs ; hind 

 thighs and hind shanks thick, dark pitchy, the latter slightly curved ; 

 foot-cushions tawny ; claws black, ferruginous at the base : wings 

 gray, tawny towards the base ; a large brown spot on each disk : 

 wing-ribs ferruginous ; veins tawny, pitchy towards the tips ; poi- 

 sers tawny. Length of the body 6 lines ; of the wings 10 lines. 



a. Sierra Leone. Presented by the Kev. D. F. Morgan. 



Merodon tenebricus, n. s., fem. Niger, thoracis vittis quinque ca- 

 nis, scutelli rnargine postico ferrugineo, abdominis lateribus cano 

 maculatis, segmentorum apicem versus marginibus posticis fulvis, 

 antennis rufis, pedibus piceis, femoribus posticis nigris, tibiis 

 posticis ferrugineis, alis fuscis. 



Body black : head covered with pale dull tawny bloom, clothed 

 with pale yellow hairs ; crown black, shining, beset with a few 

 black hairs : mouth black : feelers red : eyes bronzed, bright ; all 

 the facets very small : chest thinly clothed with short black hairs, 

 adorned with five hoary stripes ; middle stripe very slender ; hind 

 border of the scutcheon ferruginous ; breast clothed with hoary 

 hairs : abdomen short-obconical, not longer than the chest, very 

 thinly clothed with short tawny hairs, adorned on each side with 

 large patches of hoary bloom ; hind borders of the last segments 

 tawny : legs pitchy, clothed with short tawny hairs ; foot-cushions 

 tawny ; claws ferruginous, with black tips ; hind thighs black, very 

 thick ; hind shanks dark ferruginous, slightly curved : wings brown; 

 wing-ribs and veins pitchy ; poisers tawny. Length of the body 4 

 lines; of the wings 9 lines. 



