424 
Mr. Cecil W. Barker^s 
appearance and habits,, evidence whicli alone ought to be 
sufficient to substantiate their identity as one species. 
Teracolus evenina. — I have had little personal expe- 
rience of the habits of this fly, but judging by the 
description alone of variety A, Trimen (T. d&idamoidesy 
Aurivillius) , with its reduced development of the black 
markings of the upperside and tinted irrorated underside, 
I should have little hesitation in concluding it to be the 
dry season form of the type. My only two captures of 
T. evenina, var. A, are one 6 at Johannesberg, in 
November, 1887, and one ? up the Pungwe River, in 
September, 1894. 
Teracolus achine, T. gavisa, and T. antevippej I have 
the strongest grounds for believing to be specifically 
identical. T. gavisa is probably a local form of T. 
achine, and takes the place of the former in the more 
luxuriant semi-tropical localities of the south-eastern 
coast belt. T. achine is itself rarely met with upon 
the Natal coast, and many forms, intermediate between 
T. achine and T. gavisa, are also fairly prevalent in the 
spring and summer. T. gavisa, during the summer 
months, is one of our commonest flies upon the Natal 
coast, and continues with transitional forms, approxi- 
mating it to T. antevippe, till the autumn or change of 
the seasons. It is then succeeded in the winter or dry 
season months by the typical T. antevippe. 
I retain in my collection eleven specimens under 
the heading T. gavisa, and twelve under that of 
T. antevippe, to illustrate the gradations of the one 
form to the other and some of the variations, seasonal 
and local, of T. antevippe itself. 
As the summer advances into autumn, examples of 
T. gavisa exhibit contraction of the width of the black 
bordering of the apices of the forewings, and of the 
other fuscous markings of the upperside, especially as 
regards the width of the longitudinal bands of fore and 
hindwings. On the underside the black neuration does 
not extend so far towards the base, and inclination is 
shown to slight freckling about the apices of the fore 
and over the disc (especially near base) of the hind- 
wings, but still leaving the whitish ground unafiected 
by a darker tint. 
Later on in the season the apices of the forewings and 
disc of hindwings on the underside become tinted, and 
