1899.] GROTE — SPECIALIZATIONS OF LEPIDOPTEROUS WIXG. 17 



nation of vein i, the alternative being that the ''proicostal spur" 

 is homologous with the shoulder veins of the Lachneidce. But, in 

 Papilio ffiac/iaon, it is the base of vein i which clearly shrinks, vein 

 ii being strong and continuous. In Parnassius the praicostal spur 

 appears to emerge from vein ii, and the cross-vein has become 

 absorbed. 



Hypermncstra helios (d"). 



Characterized by the extreme diminution of the humeral cell 

 of secondaries, which is so reduced as at first to escape notice. 

 The position of vein iii, shows an advance upon Parnassius, while 

 in that of iv^ it lags behind its ally. Else the neuration of the two 

 generally agrees. 



Subfam. 2. Zerynfhia?icE. 

 This subfamily must take its name from Zeryniliia Ochs., 181 6, 

 because Thais Fabr., 1807, which is the older title for the same 

 type, is preoccupied (Scudder, /. c, 279). Not observing this, I 

 originally used for it the name Thaidincs. No other author, so far 

 as I know, had proposed this division of the Parnassiidae, which in 

 itself seems a natural one. The Zerynchianae are intermediate, in 

 the specialization of the wings, between the Parnassiidce and the 

 Papilionida^. 



Radius five-branched, generalized : 

 Internal vein (viii) of hind wings relatively short, not 



reaching anal angle Arc/ion. 



Internal vein (viii) of hind wings reaching anal angle : 

 Hind wings without special prolongation of 



vein ivj Zerynthia. 



Hind wings with slight special prolongation 



of vein ivg Luehdorjia. 



Hind wings with a long " tail " to vein \\\ 

 and also shorter prolongations to veins 



Vi and V2 Anuandia. 



Hind wings with only a long '' tail " to 



vein iv3 Sericinus. 



Archon apoUinus. 



A character of specialization is found in the shortened and 

 bent internal vein of secondaries which follows the inward 



PROC. AMER. PHILOS. SOC. XXXYIII. 159. B. PRINTED JULY 7. 1890. 



