riERIN/E. 



13 



and New Worlds, are further ornamented by a black stripe along the 

 inner margin of the fore-wings (like the corresponding marking so 

 prevalent in many females and some males of the genus Teracohis), 

 and in the pretty American group repi-esented by T. Delia and T. 

 Mathca, Cram., this stripe is in the $ edged with orange on the 

 inner margin itself. 



These insects are for the most part of weak flight, and keep near 

 the herbage, but those of them that are more partial to open ground 

 are moderately active on the wing, and have the Pierine habit of flpng 

 onward instead of keeping about one spot. Doubleday {op, cit., p. 78) 

 observes that T. Nicippc (Cram.) — which in colouring and pattern 

 strongly resembles one of the deeper-tinted species of Colias — in the 

 United States flew abundantly in clover-fields in company with Col. 

 Philodice and Col. {Mcganostoma) Ccesonia, and that in flight it was 

 more like those swift butterflies than its own congeners. 



The South- African forms are all yellow, with more or less developed 

 black borders ; the males having the ground-colour bright gamboge 

 or chrome and the border deep black, while the females are of a paler, 

 more sulphur tint, with the border more dusky. Three groups are 

 typically represented by Tcrias Brigitta (Cram.), T. floricola, Boisd., 

 and T. Besjardinsii, Boisd. : with the first is associated T. Zoe, Hopfi". ; 

 with the second T. ^-iEthiopica, mihi { = Scncgalcnsis, Geyer, ncc Boisd.), 

 and T. Butlcri, mihi ; and with the third T. regularis, Butl. 



The Brigitta group has the fore-wing border very broad, and the 

 hind-wing one much narrower, or even (in the $) reduced to small 

 nervular spots ; the upper side of the $ is more or less irrorated basally 

 with fuscous scales : the under side of both sexes is also faintly irrorated, 

 the hind-wing being feebly marked with some transverse dusky streaks. 



The Floricola group (not separable from the Indian T. Hecale 

 (Linn.), group) has the fore-wing border broad or very broad hind-mar- 

 ginally and more or less deeply bi-excavated or bi-sinuated on its inner 

 edge, and the hind-wing border very narrow, or represented only by 

 small spots or even dots ; the upper side of the $ is not irrorated • the 

 under side of both sexes is free from irroration, and its markino-s 

 usually much more distinct, dentated irregularly, and ferruo-inous 

 there being commonly a conspicuous patch of the latter colour close to 

 the apex of the fore-wings. 



The Desjardinsii group has the fore-wing border moderately broad, 

 narrow, or very narrow, with its inner edge more as in the Brigitta 

 group, and the hind-wing border varying from narrow to purely macu- 

 lar ; the under-side markings are intermediate in character between 

 those of the two foregoing groups respectively; the hind- wings are 

 bluntly angulated at extremity of second median nervule.^ 



1 The allied forms from Central and South America separated from Terias by Mr. Butler 

 in 1870, under the generic title of Spluenogona, present a sharp angle or even prominent 

 caudate projection at the same point of the hind-wings. 



