BY K. J. TILLYAHD. 



69 



fine, vellow rings; the abdomen much shorter, more cylindriral, 

 without anv humps, the latero-basal spots less rounded, ratlier 

 subtriangular, the apico-ventral spots distinct, larger than in ^; 

 the apex as in Text-fig.3,A. Prothorax of ^ h'^s a narrow, 

 raised, transverse ridge, bright yellow. 



Hah. — Waroona, W.A. A number of specimens taken by 

 Mr. G. F. Berthoud, in January- February, 1913-1915. Also a 

 single, fine 9 taken at Yallingup, W.A., by Mr. R. E. Turner, 

 on January 7th, 1914. 



Types, (J9, in ('oil. Tillyard (Waroona, W.A.; G. F. Berthoud; 

 (J, January 6th, 1914: 9, February 24th, 1914). 



This fine species differs from S costa/is Newman (Eastern 



Australia) in the following points. In 

 the (J of S. costalis, the wings are broader, 

 and the black, longitudinal streak does 

 not include the costal space, but only 

 touches the bases of the costal cross-veins. 

 Also, in all four wings of <S. costalis, the 

 basal border of the apical, black patch is 

 irregular. The antennae of S. costalis are 

 longer, and ringed with yellow; the head, 

 thorax, and segments 3-4 of abdomen 

 much less hairy, the abdomen much 

 shorter, stouter, and with only a single 

 hump, placed dorsally on 4. The golden 

 spots of the abdomen in S. costalis are 

 confined to segments 5-7 laterally, 4-6 

 ventrally; the only, large, round spot is 

 placed basally on segment 5. This pattern 

 is shown in Text-tig. 1, B. The appendages of 6". costalis ^ are 

 black, and less complicated than those of S. dromedaria {cf. 

 Text-fig. 2, A and B). 



The females of the two species are less easy to separate, but 

 S. dromedaria 9 naay be distinguished by the shorter antennae, 

 the black costal space of the hiridwing, the straighter, inner 

 edge of the black, apical patch, and by the different form of the 

 apex of the abdomen (cf. Text-fig. 2, A and B). 



B. 



Texttiti.S. 



