1396 Hymenoptera in America North of Mexico 



Type-species: Leptotkorax {Dichothorax) pergandei Emery. Desig. by Wheeler, 

 1911. 



The status of the two forms below needs clarification. Though regarded as subspecies, the 

 ranges overlap considerably. 



Revision: Emery, 1895. Zool. Jahrb., Abt. f. System. 8:318, 323-324. —Wheeler, 1903. Acad. 

 Nat. Sci. Phila., Proc. 55:224, 256-260. 



pergandei floridanus Emery. N. J., N. C. to Fla., w. to Tex. Ecology: Has been found in 

 stumps, logs, and nut shells. 

 Leptotkorax (Dichothorax) floridanus Emery, 1895. Zool. Jahrb., Abt. f. System. 8:318, 324. 



Leptotkorax (Dickotkorax) pergajidei flavus Smith, 1929. Ent. Soc. Amer., Ann. 22:549. 5, 



9. 

 Leptotkorax (Dickotkorax) pergandei floridantis var. spinosus Smith, 1929. Ent. Soc. 



Amer., Ann. 22:551. 5 . 



Taxonomy: Smith, 1931. Ent. News 42:18-19. 



Biology: Dennis, 1938. Ent. Soc. Amer., Ann. 31:290, 305. 

 pergandei pergandei Emery. D. C. s. to Ga., Tenn., w. to Nebr., Tex. Ecology: Apparently a 

 ground nesting species. 

 Leptotkorax {Dickotkorax) pergandei Emery, 1895. Zool. Jahrb., Abt. f. System. 8:318, 323. 



5. 

 Leptotkorax {Dickotkorax) manni Wesson, 1935. Ent. News 46:208. 5 , 9 , 6. Preocc. by 

 Wheeler, 1914. 



Taxonomy: Wheeler, 1903. Acad. Nat. Sci. Phila., Proc. 55:224, 256-259 (worker, female). 

 —Smith, 1924. Ent. News 35:50. —Cole, 1940. Amer. Midland Nat. 24:56, 58. —Wheeler 

 and Wheeler, 1960. Ent. Soc. Wash., Proc. 62:23 (larva). 



Biology: Dennis, 1938. Ent. Soc. Amer., Ann. 31:290. — Buren, 1944. Iowa State Col., Jour. 

 Sci. 18:288. 



Genus LEPTOTHORAX Subgenus LEPTOTKORAX Mayr 



Leptotkorax Mayr, 1855. Zool.-Bot. Gesell. Wien, Verh. 5:431. 



Type-species: Formica acervorum Fabricius. Desig. by Bingham, 1903. 

 Myckothorax Ruzsky, 1904. Sapiski Imp. Russ. Geog. Obshch. 41:288. 



Type-sjjecies: Formica acervorum Fabricius. Orig. desig. 



In North America, this subgenus is confined mostly to the northern and western United 

 States and Canada. The ants nest in living and dead trees, decaying wood, soil, or stumps. Some 

 are inquilines in nests of other ants and some are dulotic. 



Taxonomy: Brovm, 1955. Ent. News 66:43-50. —Wheeler and Wheeler, 1955. Ent. Soc. Amer., 

 Ann. 48:21-22 (larvae). 

 crassipilis Wheeler. Wyo., Colo., N. Mex., Utah, Ariz., Nev. Ecology: Found under rocks, under 

 wood, in decaying logs. 

 Leptotkorax (Myckotkomx) acervorum crassipilis Wheeler, 1917. Amer. Acad. Arts and 

 Sci., Proc. 52:513. 5, 9, cJ. 



Taxonomy: Cole, 1954. Tenn. Acad. Sci., Jour. 29:240-241. 



Biology: Cole, 1953. Ent. Soc. Wash., Proc. 55:27. —Gregg, 1963. Ants of Colo., pp. 401^02, 

 405. 

 diversipilosus Smith. Wash. Ecology: An inquitine in nests of Form,ica obscuripes Forel. 

 Leptotkorax (Myckotkorax) diversipilosus Smith, 1939. Ent. Soc. Wash., Proc. 41:179. $, 

 ergatoid 9. 



Taxonomy: Smith, 1956. Ent. Soc. Wash., Proc. 58:271-275 (female, ergatoid male). 



Biology: Alpert and Akre, 1973. Ent. Soc. Amer., Ann. 66:753-760 (distribution, abimdance, 

 behavior). 



