182 [January. 



Posterior wings : the transverse basal 

 nervules between tlie radius and the 

 upper cubitus suddenly thickened and 

 geniculate at their upper end. 



Appendages of $ long, flesuous, red- 

 dish, loith a strong inner tubercle lefore 

 the apex, bearing strong black spinose 

 hairs (or this tubercle may be considered 

 the actual apex, from beneath which pro- 

 ceeds a straight cylindrical process). 



Posterior wings : the transverse basal 

 nervules between the radius and the 

 upper cubitus sometimes slightly thick- 

 ened, but not geniculate at their upper 

 end. 



Appendages of S short, curved, yel- 

 low, obtuse, with no inner tubercle (or 

 with no apical process, according to what 

 appears to be the real nature of the 

 appendages in occitanica). 



Thus the most decisive characters wliereby to separate the two 

 species lie in the form of the apical joint of the labial palpi, fJie 

 presence or ahsence of a short blackish basal line in ihe anterior tvings, 

 the comparative sizes of the two rows of pentagonal cellules in the costal 

 area in these loings, and in the form of the anal appendages in the ^ . 



Eambur's descriptions of the two are mostly excellent ; but there 

 is one expression so vague, and so apparently contradictory, that it 

 quite misled me. In describing A. occitanica, he says simply, " espace 

 costal ayant deux rangees d'areoles ;" in describing bcetica he says, 

 " espace costal contenant deux rangees d'areoles, dont une plus large 

 que chez Y occitanica.''^ The latter expression would leave it to be 

 inferred that the two rows were unequal in bcetica, and equal in occi- 

 tanica, whereas the contrary is the case, and the only way of reading 

 it so as to bear even a semblance of truth, is that one row in bcetica is 

 broader (or larger) than the corresp>onding roiv in occitanica ; and I 

 suppose that is what he really intended. 



The presence or absence in the anterior wings of the short black 

 or blackish basal line* between the two cubiti ("la 4™® et 5™® nervures" 

 of Rambur) is an excellent prima facie character, not alluded to by 

 previous authors. 



Hagen, Stett. Zeit., 1866, p. 288, calls attention to a slight cha- 

 racter in the neuration (it should have been stated only of the posterior 

 wings), viz., that immediately under the radius ("mediana") there 

 exists, in bcetica, a rudimentary longitudinal nervure in which the 

 transverse nervules end (instead of directly in the radius) ; it cer- 

 tainly exists in most specimens of bcetica examined by me, but it equally 

 exists in some undoubted specimens of occitanica ; the geniculation of 

 the end of these nervules appears to be constant in occitanica and 

 absent in bcetica. 



* Hagen, Stett. Zeit., 1858, p. 125, alludes to an example of occitanica with a black streak, 

 under the sector of the radius up to the pterostigma. 



