Neivamyrmex pilosus (F. Smith)

Snelling, G. C. & Snelling, R. R., 2007, New synonymy, new species, new keys to Neivamyrmex army ants of the United States., Advances in ant systematics (Hymenoptera: Formicidae): Homage to E. O. Wilson - 50 years of contributions. (Memoirs of the American Entomological Institute 80), pp. 459-550: 488-489

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Neivamyrmex pilosus (F. Smith)



Neivamyrmex pilosus (F. Smith)  HNS

Figures 13 a-b, 44, 59, 72, 86, 1110, 111, 121, 135, 146, 150, 151

Eciton pilosa F. Smith  HNS, 1858: 151 (w). BRAZIL, Amazonas, Vila Nova ( BMNH).

Eciton clavicornis Norton  HNS, 1868: 46 (w). MEXICO, Vera Cruz, Hacienda Potrero (types lost?).

Eciton pilosum  HNS: Mayr, 1865: 77; 1886: 120. Dalla Torre, 1893: 5.

Eciton (Labidus) subsulcatum Mayr  HNS, 1887: 440 (m). U. S. A., Texas (NHMV).

Eciton mexicanus  HNS: Dalla Torre, 1893: 4. Forel, 1899: 27.

Eciton (Acamatus) pilosum  HNS: Emery, 1894 a: 183. Emery, 1900 a: 524; Emery, 1910: 25. Borgmeier, 1923, 48. Borgmeier, 1934: 94. Wheeler, G. C., 1943: 331 (larva).

Eciton (Labidus) mexicanum  HNS: Emery, 1895 b: 260. Emery, 1896 a: 33. Misidentification

Eciton pilosum  HNS: Forel, 1899: 27. Wheeler & Long, 1901: 165.

Eciton (Acamatus) mexicanum  HNS: Emery, 1900 a: 515, 525. Emery, 1910: 26. Wheeler, 1908: 414. M. R. Smith, 1931: 16.

Eciton aztecum Forel  HNS, 1901: 49 (m). GUATEMALA, San Jose ( MHNG).

Eciton (Acamatus) pilosum  HNS: Wheeler, 1908: 412. Wheeler, 1921: 313. M. R. Smith, 1924: 85; M. R. Smith, 1931: 295. Reichensperger, 1939: 297 (q).

Eciton (Acamatus) pilosum var. angustius Forel  HNS, 1909: 256 (w). PARAGUAY, San Bernardino ( MHNG).

Emery, 1910: 25. Wheeler, 1921: 312. Eciton (Acamatus) mexicanum var. azteca  HNS: Emery, 1910: 26. Eciton (Acamatus) pilosum var. beebei Wheeler  HNS, 1921: 312 (w, m). GUYANA, Kartabo (MCZC). NEW

SYNONYMY. Eciton (Acamatus) pilosum var. aztecum  HNS: Wheeler, 1921: 314. Eciton (Labidus) spininodis subsp. militarium Santschi  HNS, 1929: 85 (w). PANAMA, Bocas del Toro,

Changuinola (BASEL). Borgmeier, 1953: 14. Eciton (Acamatus) porrectognathum Borgmeier  HNS, 1933 b: 167 (m). BRAZIL, Rio de Janeiro, Angra dos

Reis u. Itatiaia (?). Eciton (Acamatus) pilosum var. mexicanum  HNS: Borgmeier, 1936: 59. Borgmeier, 1939 a: 416.


Eciton (Neivamyrmex) pilosum  HNS: M. R. Smith, 1942: 544. Creighton, 1950: 75.

Neivamyrmex pilosus porrectognathum  HNS: Borgmeier, 1953: 5. BRAZIL, Angra dos Reis and Itatiaia (IBVB).

Neivamyrmex pilosus mexicanus  HNS: Borgmeier, 1953: 17. Misidentification

Neivamyrmex pilosus beebei  HNS: Borgmeier, 1953: 19.

Neivamyrmex pilosus  HNS: Borgmeier, 1955: 361 - 373 (w, q, m).

Neivamyrmex pilosus subsp. beebei  HNS: Borgmeier, 1955: 373 (w, m).

Neivamyrmex pilosus subsp. mexicanus  HNS: Borgmeier, 1955: 374 (w, q, m). Watkins, 1976: 16. Watkins,

1982: 197 - 247. Watkins, 1985: 479 - 502. Misidentification


UNITED STATES: Arkansas and Mississippi west to southern Arizona; MEXICO: border states south to Chiapas; south to BRAZIL and PARAGUAY.


We have 56 records of this wide-ranging species in the United States.


The male type of Labidus mexicanus  HNS, described from Orizaba, Mexico by F. Smith (1859), has been examined. It is a specimen of N. swainsonii (Shuckard)  HNS, not a form of N. pilosus  HNS. Accordingly, L. mexicanus  HNS is removed to the synonymy of that species.

We have examined both males and workers from throughout the extensive range of this species. We have found that the features distinguishing the several recognized subspecies form a continuum from north to south, with no clear demarcation for any of these features. Accordingly, all these are here placed in synonymy.

Watkins (1985) indicated on his map of the distribution of N. pilosus mexicanus  HNS that this ant had been collected from California. We have examined the specimens, purportedly collected at Exeter, Tulare County, and concur that they are N. pilosus  HNS. However, it is our opinion that these males are probably incorrectly labeled and we have not included California within the distribution of N. pilosus  HNS.

Automontage images of the worker caste (as N. pilosus mexicanus  HNS) are located at antweb. org.


United Kingdom, London, The Natural History Museum [formerly British Museum (Natural History)]


United Kingdom, London, The Natural History Museum [formerly British Museum (Natural History)]


Switzerland, Geneva, Museum d'Histoire Naturelle


Switzerland, Geneva, Museum d'Histoire Naturelle