182 



H. STEMPFFER 



Genus THESTOR Hiibner 



Thestor Hiibner, 1823, Verz. bek. Schmett. (5) : 73 ; Swanepoel, 1953 : z 49- Type-species : 



Papilio petahis Cramer, 1779 (Papilio protumnus Linnaeus, 1764), designated by Scudder 



(1875, Proc. Am. Acad. Arts Sci. 10 : 281). 

 Arrugia Wallengren, 1872, Ofvers. K. svenska VetenskAkad. Fork. 29 : 47 ; Aurivillius, 



1898 : 343 ; 1924 : 433 ; Murray, 1933 : 99- 



Head small ; eyes glabrous ; palpi long, extending far beyond the frons, second segment 

 clothed below with white adpressed scales, third segment with a blunt apex, palpi longer in $ 

 than in $ ; antennae very short, thick shaft gradually increasing in thickness from the base 

 to the undifferentiated club, which has a rounded apex ; thorax robust ; abdomen long and 

 thick, especially in the 9 '• legs short, scaly, tibiae much shorter than femora and without 

 apical spurs ; 5* fore tarsus distinctly five-segmented like that of the female, and with two 

 curved terminal claws. 



Wing-shape. Fore wing costa straight, apex slightly rounded, outer margin slightly convex, 

 inner margin straight and much shorter than the costa ; hind wing oval, outer margin convex, 

 anal angle very rounded. In their massive build and dull brown and black colours, the species 

 of Thestor have more the appearance of Hesperiidae than Lycaenidae. 



Wing venation (Text-fig. 315). Fore wing with 11 veins. 



Male genitalia (Text-fig. 162). Uncus a narrow band whose distal edge bears in the middle 

 two very long recurved processes, each with a sharp pointed apex ; subunci long, curved, 

 rather slender ; tegumen subrectangular ; vinculum narrow with a saccus ; above the penis 

 are two subtriangular processes which have a blunt and slightly serrate apex, and are connected 

 by a membrane both to the dorsal section of the vinculum and to the middle of the dorsal edge 

 of the valves [Van Son, in his paper on some species of Thestor (1957, Ann. Transv. Mus. 21 : 442, 

 fig.) gave these processes the name of " Labiles ". I believe that they correspond to the upper 

 fultura] ; lower fultura crescentic, fused to the base of valves, valves oblong, distal portion 

 widened, with an almost straight terminal edge ; penis elongate, robust at the base, curved, 

 tapering gradually in its external portion, vesica clothed with numerous cornuti which give it a 

 shagreened appearance ; uncus almost glabrous, distal portion of valves pilose. 



Fig. 162. Thestor protumnus protumnus (Linnaeus), o" genitalia. 



