50 INSECUTOR INSC1TI/«E MENSTRUUS 



any tendency to the loss of the central row laterally on the segments or 

 to the enlargement of the posterior row to form a band. In this respect 

 they are more generalized than in the Antilleem form, where the posterior 

 spots are enlarged. The absence of the large tubercles places the larva 

 safely with the continentsJ series. 



It appears to me that in this peculiar case special names for the larval 

 forms would be of service. The original locality will be the only guide 

 in applying names which are founded on the adult only. In the case of 

 timais, the original locality " Coromandel coast " is evidently in error, as 

 this species is not known outside of America ; it is impossible to say 

 whether the specimens Ccime from the Guianas or West Indies. As this 

 is the oldest name, it may be retained as a general name for the species 

 and not applied to any larva. The known larvae separate as follows : 



With large conical black tubercles ...... antillium Dyar^ 



Tubercles rudimentary, inconspicuous. 



Spots alike, the posterior segmental row not enlarged . amaryllidii Sepp 



Spots differentiated, the posterior row (used into a band. 



Anterior row of one dorsal dot and two lateral dots, all free. 



moctezuma Dyar^ 

 Anterior row of one dorsal dot and one lateral, the latter fused to the 



posterior band of preceding segment . . . regnatrix Grote ^ 



If I have correctly interpreted the chau-acters, as to which eu-e general- 

 ized and which specialized, E. timais must have originated as an Antil- 

 lean species, crossed to the mainland in the vicinity of the Guianeis, and 

 migrated thence north and south. Larvae from Brazil and Argentina 

 should be found to be progressively more specialized southward, though 

 perhaps the specialization will have taken a different course from that 

 shown in the northward distribution of the species. 



' A good figure of this larva, except that the red-colored parts axe too pale, is given 

 by Dewitz (Nova Acta der Ksl. Leop. -Carol. -Deuts. Akad. der Naturf., xliv, 256, 

 pi. viii, fig. 12, 1882). 



^A new name for the Mexican larvae described by me (1ns. 1ns. Men., i, 21, 1913). 



^Described from Pennsylvania. I assume it to be the name to be applied to the 

 larvae from Florida. 



Date of publication, April 30, 1913. 



