A Revision of the genus Tarucus. 287 



are of a much more delicate lilac bhie, with a small spot 

 closing the cell ; in all the black termen is moderately 

 narrow, not linear. 



The underside of the Mediterranean form is usualh'' 

 strongly spotted, the spots being often large and very 

 black, excluding, of course, the basal streaks, that is to 

 say, the spots are generally more or less distinct in both 

 wings. The form from Asia Minor and from India has 

 the postmedian band in the secondaries as a series of 

 lunules, or a more or less broad lunular band. In my 

 specimens from Senegal the -^ pattern is very fine, but the 

 5 pattern is heavier and more Uke the type form. 



The genitalia are totally distinct in some particulars from all 

 others in the genus ; the clasps are quite diverse, as also is the 

 aedoeagus, whilst the parts representing, perhaps, the horn-like 

 sclerites rest in an entirely different position. The clasps are long 

 and of moderately even width, terminating in three tusk-like teeth, 

 one at the lower extremity and two deeply-divided at the upper 

 extremity ; the horn-like sclerites, instead of lying along the hollow 

 of the clasp, rise immediately from their origins at the extreme 

 base of the clasp, and occupy a position just above its upper margin 

 at the rear, they do not extend much beyond the centre ; whilst in 

 the first section they lie almost " perdu " in the hollow of the basal 

 part of the clasp and rise into prominence well beyond the centre, 

 and are always within the clasp itself, their apices only extending 

 occasionally outside. The aedoeagus is very long, of moderatelj' even 

 and narrow width, tapering slightly to the apex ; the vesica is echinoid 

 in form but without the spines, it is a very delicate and beautiful 

 object. The tegumen is very deeply divided, with narrow wedge- 

 shaped cheeks which carry prominent falces; the bristles are fine, 

 of moderate length and number; there are, however, very few on 

 the clasps ; the tectorius is well developed, but quite different in 

 shape to all its allies. 



At first sight it would appear that the Mediterranean 

 specimens with heavily marked undersides would probably 

 be theophrastus, but that is not really the case, and it is 

 very far from being so with those that have a fuier under- 

 side pattern. I have a series from the Caucasus that I 

 had no doubt were this species — large, heavily-marked 

 specimens; but the pattern was very confluent, and this 

 impelled me to examine the genitalia; these proved quite 

 conclusively that the species was T. balkanica, whilst part 



