318 WHEELER. 



near Mount Orizaba, in the state of Vera Cruz, Mexico. ]Mayr was 

 struck by the pecuHarities of the insect, in which he detected re- 

 semblances to the .\frican Dorylus {Typhloponc and Anomma) on the 

 one hand and to the Ponerinre on the other. Since its description, 

 C. nortoni has been recorded only from Mexico and British Honduras. 

 Very recently Mann has taken a few specimens of it in Spanish 

 Honduras, but it seems to be rare and sporadic, and no observations 

 have been published on its habits. In 1S94, Emery described an 

 opaque form from Peru as the subsp. andicola, but Forel, after examin- 

 ing numerous specimens from the highlands of Colombia, raised it ta 

 specific rank. 



In his comparative studies of the DoryliucT Emery made the inter- 

 esting suggestion that the male of C. nortoni might be the form previ- 

 ously described from Mexico as Lahidus nwrosns by F. Smith (1859) 

 and p^o^•isionally cited in the Genera Insectorum as Eciion {Labidus?) 

 morosum. Forel described from Honduras and Mexico a variety of 

 this male as paynrum, which seems to differ from the type only in a 

 few insignificant characters, and Emery has also described a male 

 specimen as subsp. vrsimim from Brazil. It will be seen that nortoni 

 and morosns have precisely the same distribution. This is also e\i- 

 dent from the specimens in my collection, which comprise worker 

 topotypes taken by F. Silvestri at Orizaba, and males taken by Fred. 

 Knab in the same locality, also workers taken at Manatee, British 

 Honduras by J. D. Johnson and a male taken in the same country by 

 Prof. C. H. Fernald. These and more cogent considerations to be 

 cited below so thoroughly convince me that Mayr's nortoni is merely 

 the worker of Smith's morosns that I propose to change the name of the 

 species to Chcliomyrmex morosns (F. Smith). In British Guiana I 

 found the workers of a Chcliomyrmex which I at first took to be 

 morosns and also secured the males, Avhich I ani sine had escaped 

 from its colonies, but on closer examination I am inclined to regard 

 this form as a distinct species and describe it below as C. mcgalonyx 

 sp. noA'. Since the range of the genus has thus been extended to 

 British Guiana, it is probable that Emery's ursinum really represents 

 a fourth species, peculiar to Brazil. 



Emery has made the further interesting suggestion that Chelio- 

 viyrmcx is an archaic genus, and this is borne out by a study both of 

 the worker and the male, for the characters of both show a mixture 

 of the characters of Dorylus and of Eciton, together with certain 

 peculiarities observable in no other ants of the subfamily. Thus in 

 the worker, the structure of the thorax and pedicel, the feeble carina- 



