1907.] Whcclcr, Fungus-growing Ants of North America. 719 



sculpture. The tAvo median occipital teeth of borinquenensis are represented 

 by low, pointed ridges. 



13. Cyphomyrmex rimosus Spino/a. 



Cryptocerus ? rimosus Spinola, Mem. Accad. Sci. Torino (2), XIII, 1851, p. 6.5 no. 



49, o^. 

 Cryptocerus rimosus F. Smith, Trans. Ent. Soc. London (2), II, 7, 1S54, p. 223, no. 28. 

 Meranoplus difformis F. Smith, Catalog. Hymen. Brit. Mus., \T, 1S5S, p. 195, no 



7, 0- 

 Cryptocerus rimosus F. Smith, Trans. Ent. Soc. London (3), I, -4, 1862, p. 409, no 



11, 0. 

 Meranoplus difformis F. Smith, Trans. Ent. Soc. London (3), I, 4, 1862, p. -413, 



no. 7, 0- 

 Cyphomyrmex deformis Mayr, Verb. zool. bot. Ges. Wien, XXXVII, 1887, p. 558, 



9 d^ (in part). 

 Cyphomyrmex rimosus Dalla Torre, Catalog. Hymen., VII, 1893, p. 150 (in part). 

 Cyphomyrmex rimosus Emery, Bull. Soc. Ent. Ital., XXVI, 1894, pp. 88, 89. 

 Cyphomyrmex rimosus LTrich, Trinidad Field Nat. Club, II, no. 7, 1895, p. 181. 

 Cyphomyrmex rimosus Forel, Biol. Centr.-Am., Hymen., Ill, 1899-1900, p. 40. 



The typical form of this widely distributed and variable species appears 

 to be confined to northern South America and the adjacent mainland of 

 Central America and ]Mexico. It is represented in my collection by a few 

 worker and female specimens from Grenada, Nicaragua (C. T. Baker) and 

 a number of workers from Manatee, British Honduras (J. D. Johnson). 

 In these specimens the postpetiole of the worker is less than twice as broad 

 as long and the color is of a rich yellowish brown, with the head and posterior 

 portion of the gaster clouded with dark brown. In the female the post- 

 petiole is scarcely broader in proportion to its length and has a perfectly 

 straight posterior border. According to Emery the male has a relatively 

 narrow head, with very acute posterior angles and the postpetiole is less 

 than 1^ times as broad as long. A single worker in my possession from 

 Ha}ii (P, J. Schmitt) approaches the typical rimosus more closely than the 

 Central American specimens, as its thoracic protuberances are longer and 

 more acute and the postpetiole is only 1^ times as broad as long. The 

 following variety, according to Emery (in liiteris), approaches the typical 

 rimosus very closely except in its darker color. 



14. Cyphomyrmex rimosus var. comalensis var. nov. 



Worker. (PI. XLIX, Fig. 1.) Length: 1.8-2 mm. 



Head, without the mandibles, longer than broad, much narrower in front than 

 behind, with obtu.sely excised posterior margin and rather sharply angular posterior 



