PACHYGASTRIA TRIFOLII. 11 



4. Yellow with the transverse median band contracted and broken (in one 

 example observed restricted to a small semicircular costal patch that just includes 

 the typical white median spot)=ab. contracta -flava, n. ab. 



We have seen no examples of P. trifolii from any part of the 

 Palaearctic region quite like the specimens that belong to this group, 

 which, in Britain, appears to be confined to the coasts of Kent and 

 Sussex, between Lydd and Rye. The nearest approach to it is found 

 in P. eversmanni, generally, however, considered a distinct species, and 

 P. trifolii var. terreni. In P. eversmanni and P. terreni (at least those 

 in British Museum coll.) as in P. trifolii var. flava, there is the same 

 general tendency to a clear yellow colour, to a restriction of the red 

 (when not altogether absent) to the transverse lines of the forewings, 

 the edge of the white central spot, and to a general suffusion of pinkish 

 leading up to red on the hind wings. 



Ground colour yellow-grey or buff. 



1. All the wings yellow-grey without markings— ab. dbsoleta-medicaginis, 

 n ab. 



2. Yellow-grey with pale outer transverse line and darker basal patch=ab. 

 medicaginis, F. J. A. D. 



3. Yellow-grey with distinct transverse lines and more or less developed 

 median band=rab. virgata-medicaginis , n. ab. 



4. Forewings buff, outer transverse line reddish edged externally with paler, 

 fringes reddish ; hindwings reddish with a pale transverse striper^var. ratamae, H-. 

 Sch. 



5. Forewings buff, outer transverse line and edge of white median spot reddish, 

 outer margin tinged faintly with reddish ; hindwings buff, the pale transverse stripe 

 narrowly shaded with reddish internally and externally shaded with reddish to outer 

 margin=var. codes, Hb. ? 



This is a very distinct group from the above (flava). The forewings 

 of the 3 are covered with a mixture of coarse yellow-ochreous scales, 

 with some red ones, producing a general dirty yellow or buff appear- 

 ance ; the transverse lines, the circumscription of the central spot (and 

 sometimes the basal area of the forewings) are generally reddish ; 

 whilst the hindwings approach the redness of the following group in 

 tint. The ? is usually yellower, less coarsely scaled, and with the hind- 

 wings much more closely approaching the forewings in tint. The 

 group includes the southern races — the " yellow-grey " form named 

 medicaginis, the " yellow-ochreous " Spanish ratamae, the Algerian 

 "clay-yellow" mauritanica. The Sicilian codes ?, judging by 

 Hiibner's figure (335) would belong here, the S (figs. 332-333) is, 

 however, very different, and codes would appear to have the colour 

 difference strongly developed as a secondary sexual character. 



Ground colour fawn-grey or reddish-grey. 



1. All the wings unicolorous reddish-grey without any markings:=ab. obsoleta- 

 cervina, n. ab. 



2. Pale reddish-grey with distinct transverse lines, more or less developed 

 median band and reddish-brown hindwingsz=ab. cervina, n. ab. 



3. Pale reddish-grey with the transverse band contracted:=Rb. contracta- 

 cefz'ina, n. ab. 



This group contains the various aberrations which are by most 

 continental authorities combined erroneously to form the var. 

 medicaginis. The sexes are not very dissimilar, and the general 

 appearance of the specimens gives one the impression that they 

 constitute an extreme development of the preceding section. The 

 forewings, however, are essentially clothed with reddish or .red-brown 

 scales, but with enough ochreous ones mixed therewith to give them a 



