386 Mr. C. G. Lamb on Exotic Chloropidse. 



prevailing type has the blackening confined to the two side- 

 rows of pits on the dorsum and the scutellum is much paler ; 

 in a few cases the dorsum is more generally suffused, though 

 not all black, or the dorsum is entirely darkish orange. A 

 single specimen from near Durban is even quite clear orange 

 and is larger than the others. 



In all the forms the elongate abdominal segments vary in 

 colour ; the normal type is orange in the centre, with a black 

 border, but this varies much till it may nearly cover the 

 whole surface. The legs are orange, but in some cases the 

 front tibia and in others the last tarsal joints are a little 

 darkened. There is also a barely perceptible variation in the 

 slope of the hind cross-vein, which is most marked in the 

 large pale specimen. 



It appears that we have here a single variable species. 

 Although Adams (Kansas Univ. Sc. Bull. iii. 1905, p. 190) 

 omits to mention the aristal form, there can be little doubt 

 that the whole series is best placed in his species, of which 

 he had but two specimens. The larger single specimen can 

 be taken to be Becker's E. occipitalis ; in fact, Becker is 

 of the opinion that this is merely a pale variety of Adams's 

 species. 



Natal : Durban (F. Muir) ; S. Rhodesia : Chirinda 

 Forest (G.A. K. Marshall). 



ElacMptera dubia } sp. n. 



There are several specimens of a species of the cornuta 

 group, which may be a light form of E. sibirica, Lw., which 

 species Becker records from Africa. It does not absolutely 

 agree with Becker's description, and hence a brief account 

 of it is appended. 



The thoracic colour is darkened orange, not black, though 

 some specimens are more dusky than others. The puncture- 

 lines are less marked than in cornuta, largely owing to the 

 much smaller size of the diverging furrow-bristles; the 

 scutellum is more finely punctate, the end tubercles being a 

 little larger, the side ones about the same; the head is very 

 like that of cornuta, but the triangle is perceptibly smaller, 

 the thickened arista slightly longer, and the hairing of it 

 considerably denser. The legs are entirely yellow, with the 

 last tarsal joints sometimes a little suffused ; the hind tibia 

 Las a well-marked " brand" outside. 



The pleura is all red right up to the edge of the dorsum. 



The insect is of about the same size as E. cornuta. 



Natal: Durban (F. Muir, Camb. Coll.). 



