XIII. INSECTA. 
[ 1905 ] 
1619. [WpEELEB, W. M.] An interpretation of the slave-making instinct 
in ants. Bull. Arne;-. Mus. xxi, No. 1, pp. 1-16. [. Hymenoptera .] 
1620. . The ants of the Bahamas, with a list of the known West 
Indian species. T. c. No. 6, pp. ^9-135, pj v jj [Hymenoptera.] 
1621. — — . New species of Formica. T. c. No. 15, pp. 267-274. [ Hy - 
menoptera.] 
1622. The North American ants of the genus Dolichoderus. T. c. 
No. 19, pp. 305-319. [ Hymenoptera .] 
1623. . The North American ants of the genus Liometopum. T. c. 
No. 20, pp. 321-333. [Ilymenoptera.'] 
1624. . An annotated list of the ants of New Jersey. T- c. No. 23, 
pp. 371-403. [Hymenoptera.] 
1625. . Worker ants with vestiges of wings. T. c. No. 24, pp. 405- 
408, pi. xiv. [Hymenoptera.] 
1626. . How the queens of the parasitic and slave-making ants 
establish their colonies. Amer. Mus. J. v, pp. 144-148. [. Hymeno- 
ptera , .] 
1627. — — -. Dr 0. F. Cook’s ‘Social organisation and breeding habits of 
the cotton-protecting Kelep of Guatemala.’ Science xxi, pp. 706-710. 
1628. . Ants from the summit of Mount Washington. Psyche xii, 
pp. 111-114. [Hymenoptera.] 
1629. Wickham, H. F. The North American species of Cotalpa. J. N. 
York Ent. Soc. xiii, pp. 1-4. [Coleoptera.] 
1630. . New species of Coleoptera from the Western United States. 
Canad. Ent. 1905, pp. 165-171. 
1631. W ielo wieyski, H. v. Uber nutritive Verbindungen der Eizelben 
mit Nahrzellen im Insektenovarium und amitotische Kernprozesse. 
(Vorlaufige Mitteilung.) SB. Ak. Wien cxiii, pp. 677-687, pis. i, ii. 
Abstract by Garbowski, Zool. Zentrlbl. 1905, p. 404. 
1632. Willey, A. Illustrations of Ceylon Orthoptera. Spolia Zeylan. ii, 
pp. 198-200, 3 pis. 
1633. Williams, F. X. & Grinnell, F. A trip to Mt. Diabolo in search 
of Lepidoptera: with description of a new species. Ent. News 
Philad. xvi, pp. 235-238. 
1634. — — . Notes on the life history of Ilepialus sequiolus Behrens. 
' " T. c. pp. 283-287. [Lepidoptera.] 
1635. Williamson, E. B. Itinerary of a collecting trip, made especially 
in search of dragonflies, in Central America. Ent. News Philad. xvi, 
pp. 299-306. [ Odonata .] 
1636. Wilson, E. B. Studies on chromosomes, i. The behaviour of the 
idiochromosomes in Hemiptera. J. exp. Zool. ii, pp. 371-405. 
Abstractly R. Goldschmidt, Zool. Zentrlbl. 1905, p. 810. 
.1637. .* The- chromosomes in relation to the determination of sex in 
insects. Science xxii, pp. 500-502. 
1638. -— 7 —. Studies on Chromosomes, ii. The paired microchromo- 
. somes, idiochromosomes and heterotropic chromosomes in Hemiptera. 
J. exp. Zool. ii, pp. 507-545, 4 figg. 
