194 BRITISH BUTTERFLIES. 



(List, 2nd ed., p. 15) the same three species — betulae, pruni, and 

 w-album. In 1858, Kirby used Strymon for pruni, w-album, ? spini, 

 Hlicis, in his little List of the Brit. Bhopalocera, p. 3, whilst, in 1869, 

 Butler, Cat. Diarn. Lep., [., p. 192, used Strymon for ixion, Fab., 

 mars, Fab., titus, Fab. ( — mopsus, Hb.), anacreon, Fab., spini, Den., 

 ilieis, Fab., pruni, Linn., and w-album, Fab., thus overlooking Stephens' 

 restriction. In 1872, Scudderfixed (Syst, Bev.,^g. 32) titus, Fab. ( = mopsus, 

 Hb.), as the type, his action being evidently ultra vires, in face of the 

 previous usage of the name for groups, from which titus, Fab., had been 

 omitted. In 1906, we fixed (Ent. Bee, xviii., p. 131) pruni as the type. 



The pruni group, therefore, forms the typical genus of the tribe 

 Strymonidi, and it is to this, as we have shown, the name Strymon 

 properly belongs (see also preceding volume, p. 314). Like the allied 

 genera, Edwardsia (type w-album), Felderia (type eximia), this genus 

 has the characteristic $ androconial cell towards the apex of the 

 discal cell of the forewings ; it has, however, only one caudal 

 appendage to the hindwing, the upper one, very abbreviated in 

 Edwardsia, being in Strymon practically absent. The species in this 

 genus are easily recognised by the characteristic markings of the 

 underside, the orange submarginal band being continued on all the 

 wings, and markedly spotted on its inner margin in the interneural 

 spaces. This spotting suggests an alliance with the remarkable genera 

 Fixsenia (type herzi) and Leechia (type thalia), which, superficially 

 approximating to Bakeria (type ledereri) in the definitely spotted 

 underside of the wings, have the androconial brand characteristic of our 

 first section of the Strymonids present, whilst the latter has it absent, 

 this marked point of difference leading up to suggest the two species 

 as possible bases for our sections A and B respectively (antea, p. 142). 



We are indebted to Bethune-Baker for the following diagnosis of 

 our genus Strymon (based on pruni as the type) : 



Face broad, hairy, with a fringe of long hairs on each side ; vertex hairy, with 

 long curved hairs extending between the antenna?, which are fixed on the extreme 

 edge of the vertex, as far apart as possible, the antenna terminating in a short club. 

 Eyes hairy, not large. Palpi porrect, of moderate length ; end segment longish, 

 scaled ; 2nd segment fringed below with long hairs. Legs stout, rather short, 

 scaled throughout, with hairy femora. Forelegs with tarsi of male not aborted into 

 a single hook, but fairly developed, though not perfect. Wings fairly broad. 

 Primaries with costa slightly arched, depressed slightly at apex, termen slightly 

 arched below the apex, then nearly straight. Secondaries with costa slightly 

 truncate above apex, termen scalloped between the nervures, increasing in depth to 

 vein 2, which is lengthened, forming a short, stout, curved tail. Neuration : 

 Primaries, vein 2 at a third from the lower angle, 3 from just in front of the lower 

 angle, 1 and 4 from the lower angle, 5 from above the middle of the discocellulars, 

 G from the upper angle, 7 from near to 10, slightly depressed at the base, caused 

 probably by the patch of androconia, 8 and 9 absent, 10 from a fifth before the 

 upper angle, 11 from just beyond the centre of the cell ; the bases of veins 6, 7, and 

 10 have a patch of androconia, producing the appearance of a small, oval, bare 

 spot at the upper angle of the cell ; cell broad, nearly half the length of the wing, 

 and highly arched on its upper margin. Secondaries with vein 2 from a third in 

 front of the lower angle, 3 and 4 from the angle, 5 from about the middle of the 

 discocellulars, 7 from a third in front of the upper angle, well arched upwards, 

 <S highly arched upwards from close to the base; cell broad, half as long as the 

 wing. The cells and base of both wings are covered with fine superimposed hairs, 

 and the scaling beneath is different from that which obtains in the other species of 

 black hairstreaks. 



Our genus Strymon, thus limited, is a very natural little group, 

 containing, so far as we at present know, the following species — 



