132 SYEPHTDJ!. 



137. Microdon luteiventris, sp. n. 



cT $ . Length of body in the male 14 mm., in the female 17 mm. ; 

 length of antenna 4'5 mm. 



A broad and plump black species with bright yellow face and 

 abdomen, and with longer pubescence than in the two preceding 

 species. 



This species seems to be very nearly allied to my M. erythros, 

 from the Congo, which, however, has a bright red abdomen, like 

 that of the Hymenopteron Euaspis erythros, Meun. 



Male. Head black, the face yellow from the base of the antennae 

 to the margin of the buccal cavity, but the jowls are black ; occiput, 

 face, and a transverse band across the centre of the frons clothed 

 with dense but short erect hairs of a pale yellowish colour ; frons 

 elsewhere clothed with black hair, but above the antennae with a 

 triangular, smooth and shining, bare area ; frons very finely punc- 

 tate ; ocelli not so close together as in the other species ; eyes 

 shining black, with facets of equal size, the inner angle of the eyes 

 somewhat convergent, the transverse furrow on the frons not very 

 pronounced; face gently convex, very broad, broader below than 

 above ; jowls with a broad depression near the margin of the buccal 

 cavity ; antennae black, first and second joints clothed with black 

 hairs ; third joint a little shorter than the first, with a black, thin, 

 rather long arista ; second joint less than one-third the length of 

 the first ; opening of buccal cavity small ; proboscis yellowish. 

 Thorax black, subquadrate, finely punctate, clothed with rather 

 dense yellowish pubescence, which forms a broad band in front, 

 another narrower one on the suture and a smaller one before the 

 scutellum ; the hind part of the dorsum is clothed with short black 

 hair; pleurae on the fore half with yellowish pubescence, on the 

 hind half bare and smooth. Scutellum rather small, semicircular, 

 with long, erect, yellowish hairs. Squamulae black, the alar yellow- 

 fringed, the thoracic black-fringed ; halteres pale yellowish. Ab- 

 domen at base much broader than the thorax ; the first segment 

 is black, the other segments and the belly are yellow, with short 

 yellowish pubescence on the sides, base, and end, and with black 

 pubescence on the middle, where the surface is somewhat dull ; 

 genitalia yellow ; abdomen very finely punctate ; third segment 

 twice as long as the second ; fourth two and a half times as long as 

 the third. Legs short and stout, entirely sinning black, rather 

 thickly clothed with black hair ; claws black, pulvilli dark yellowish ; 

 tarsi broad and short, very shining above, especially the first joint 

 of the hind tarsi, which is rather thick Wings lightly infuscated, 

 with strong black veins and sometimes with broad black borders 

 along the veins ; outer corners of subapical and discal cells rounded, 

 and without appendices ; stump on third vein long. 



Female. Like the male, but broader, longer, and darker-coloured ; 

 head as in the male, with broader frons, and only on the occiput 

 and on upper part with black hairs; hind occipital border less 



