118 



second and third segments each with a somewhat distinct median 

 band of grey pollen, narrowly interrupted in the middle and broader 

 towards the sides ; fourth segment with several of these bands, one 

 after the other, but not very distinct. Genitalia black, with yellow 

 pubescence ; belly black. Legs entirely black, the femora sparsely 

 clothed with pale hairs and the tibiae with short yellowish pu- 

 bescence ; all the tarsi very thin, not flattened ; first joint of hind 

 tarsi simple ; hind legs more robust than the anterior ones, but not 

 thickened and entirely simple. Wings greyish hyaline, with brown 

 veins and yellowish stigma ; there is a broad infuscated pubescent 

 pat3h from the small cross-vein to the tip of the wing, extending 

 below to the lower corner of the discal cell. 



Type 6 , a single specimen from British East Africa, collected 

 by T. J. Anderson. 



Genus 24. CHRYSOTOXUM, Meigen (1803). 



This genus seems to be very poorly represented in the Ethiopian 

 Region. 



128. Chrysotoxum continum, sp. n. 



cT . Length of the body 13 mm. 



Closely resembling Chr. intermedium, Meig. (italicum^ Rond.), 

 but distinguished by having the dark costal band on the wings less 

 developed, and differing from any other European or North 

 American species known to me in having the yellow lateral stripe 

 on the thorax not interrupted at the suture. 



In the Second Part of my 'Ditteri Eritrei' (1908) I considered 

 the present species as an Ethiopian form of intermedium ; but I 

 now think it better to regard it as a distinct species, the only 

 member of its genus known from the Ethiopian Region. The 

 female is to be found in the Museum of Florence, and another 

 specimen in that of Budapest. 



There is no necessity for a detailed description, the species being 

 almost like intermedium. The first two joints of the antennae are 

 perhaps a little longer ; dorsum of thorax more shining, especially 

 behind ; the yellow lateral stripe is not interrupted, and is of equal 

 width from the shoulders to the postalar callus ; pleurae with the 

 same spots as in intermedium; scutellum yellow, with the same 

 pellucid spot. Abdominal pattern the same, the yellow bands being, 

 however, a little narrower as in all the specimens examined. Legs 

 and wings the same, but the latter only faintly infuscated along 

 the fore border, lacking the usual dark band near the end. 



Type d and two additional specimens from Nairobi, East Africa 

 Protectorate, 5. v. 1911 ; another male specimen from 13 miles 

 north of M'bagori's Village, towards Meru, East Africa Protectorate, 

 13. xi. 1911, all collected bv Mr. T. J. Anderson. 



