Parthenogenesis in Worker Ants. 663 
is possible that the presence of an alien queen with delayed 
fertility might bring about asimilar result, since the queens 
of LZ. niger, which tound their nests themselves, begin to 
lay a few days after impregnation, whereas the queens of 
L. umbratus do not lay for eight or nine months after. 
I wish here to express my cordial thanks to Mr. Donis- 
thorpe for his valuable help with the bibliography, and in 
getting the dissections done. The latter was of great 
importance, as it proved that the Gs could not have been 
fertilised. 
Bibliography. 
Avebury, Lord (Sir J. Lubbock).—* Ants, Bees, and Wasps,” 
1890. 
Comstock, Mrs. quoted by Wheeler in “Some New 
Gynandromorphous Ants,” Bull. Amer. Mus. Nat. 
Hist. 19: 676, 1903. 
Crawley, W. C—* Alien Queen Ant,” “Science Gossip,” 
vol. vi, No. 72, May 1900; “ Queens of Lasius wmbratus, 
Nyl., accepted by colonies of Lasius niger, L.,’ Ent. 
Mo. Mag., 2nd series, vol. xx, 1909. 
Denny.—Ann. Mag. Nat. Hist., 2nd series, vol. i, p. 249. 
Dewitz, H.—Zeit. f. wiss. Zool., xxvii, p. 536. 
Donisthorpe, H. St. J. K.—‘Myrmecophilous Notes for 
1909,” Ent. Rec., vol. xxi, No. 11, 1909, p. 258. 
Fielde, Miss A. M— Observations on the Progeny of 
Virgin Ants,” Biol. Bull., 9, pp. 355-360. 
Forel, A.—* Les Fourmis de la Suisse,” 1873, p. 329. 
Janet, O.— “Sur la parthenogenese Arrhénotique de la 
Fourmi Ouvriere,” Mem. Soc. Ac. de l’Oise, 1909. 
Lespes, C.—Ann. des Sci. Nat., 1863, iv, xix, p. 241. 
Reichenbach, H—“ Ueber Parthenogenese bei Ameisen,” 
Biol. Cent. xxii, 15, vii, 1902, N. 14 and 15, pp. 461— 
465. 
Wheeler, L. M.—Science, N. 8. 18: pp. 880-833, 1903. 
Ants, L9LO: 
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