538 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 90 



of South America, in which the spots in the apical portion of the pri- 

 maries are purer white than in North American examples." W. J. 

 Kaye wrote that in Jamaican and Haitian specimens the usual white 

 spots in the apex of the fore wing are oftener than not yellowish. 



As examples of intermediates between this form and typical jjlex- 

 ippus the following specimens may be mentioned : A rather dark fe- 

 male from Jalapa, Mexico, collected by Dr. William Schaus, has the 

 preapical spots on the fore v.ings pale yellowish, though the apical 

 area is very dark ; there are two complete rows of small spots in the 

 black border of the hind wings. In a female from San Jose, Costa 

 Rica, the upper preapical spots on the fore wing are white, the lower 

 ones yellowish ; the apical area is black ; the spots in the border of the 

 hind wing are obsolete, except at the anal angle. One of the specimens 

 from Juan Vinas, Costa Rica, has both rows of white spots developed 

 in the black border of the hind wings. 



The specimen from Mayagiiez, Puerto Rico, lacks the two white spots 

 beyond the end of the cell in the fore wing; the fore wing is 52 mm. 

 long. One of the females from "South America" is A'^ery dark. 



The boundary hetioeen plexippus and megalippe. — In Nicaragua 

 (Godman and Salvin), Jamaica (Kaye), Haiti (Kaye), and Cuba 

 (Bates) and along the southern and southeastern coast of the United 

 States Danaus plexippus appears to be represented by a population 

 including individuals typical of both plexippus and m^cgalippe, with a 

 complete series of intergrades. In some of these areas, as in southern 

 Central America, the megcdippe form appears to predominate; in 

 others, as in Cuba and the southern and southeastern United States, the 

 plexippus form. The exact relation between the two forms in this 

 intermediate region remains to be worked out. 



DANAUS PLEXIPPUS TOBAGI, new subspecies 



Plate 71, Figure 3 



Diagnosis. — Similar in all respects to D. p. megalippe but v,'ith the 

 ground color of the wings pale lavender-brown. 



Range. — Confined to the island of Tobago, British West Indies. 



Type — Scarborough, Tobago, collected by N. A. Wood on August 

 12, 1913, 5 (U.S.N.M.No. 53526). 



Additional specimens examined. — Tobago: Scarborough, August 5, 

 $ , Augaist 8, 9 ; Botanic Station, August 1, $ , July 24, 9 ; The Bay. 

 August 2, 9 ; all collected by N. X. Wood in 1913. 



Remarks. — This form is strikingly different from D. p. megalippe 

 in the ground color of the wings, thougli it resembles it in all other 

 features. In a rather rare aberration of D. p. plexippus {fumosus) 

 the wings have the same gxound color. 



