; femur I, 5 mm.; tibia I, 3.7
mm.

Type from Desecheo Is., Feb., No. 21688, Dept. Inv. Zoology. Paratypes
from San Juan, Porto Rico, February; Desecheo Isl., Feb., and Mona Isl.,
Feb. Nos. 21676 to 21681, Dept. Inv. Zoology.

EXPLANATION OF PLATE.

Fig. 1. Mecoloesthus signatus, abdomen and vulva.
" 2. Callilepsis grisea, vulva.
" 3. Bathyphantes semicincta, side of abdomen.
" 4. Wulfila pretiosa, vulva.
" 5. Olios bicolor, palpus beneath.
" 6. Misumessus echinatus, palpus.
" 7. Wulfila immaculata, vulvae of two specimens.
" 8. Epeira gundlachi, top and side outline of abdomen, and vulva.
" 9. Olios bicolor, palpus above.

[Illustration: NEW WEST INDIAN SPIDERS.]

PUBLICATIONS OF THE American Museum of Natural History.

The publications of the American Museum of Natural History
consist of the 'Bulletin,' in octavo, of which one volume,
consisting of 400 to 800 pages and 25 to 60 plates, with
numerous text figures, is published annually; the 'Memoirs,'
in quarto, published in parts at irregular intervals; and
'Anthropological Papers,' uniform in size and style with the
'Bulletin.' Also an 'Ethnographical Album,' and the
'American Museum Journal.'

MEMOIRS.

Each Part of the 'Memoirs' forms a separate and complete monograph,
usually with numerous plates.

Vol. I. Zoology and Palaeontology.

PART I.--Republication of Descriptions of Lower Carboniferous Crinoidea
from the Hall Collection now in the American Museum of Natural History,
with Illustrations of the Original Type Specimens not heretofore
Figured. By R. Z. Whitfield. Pp. 1-37, pll. i-iii, and 14 text figures.
September 15, 1893. Price, $2.00.

PART II.--Republication of Descriptions of Fossils from the Hall
Collection in the American Museum of Natural History, from the report of
Progress for 1861 of the Geological Survey of Wisconsin, by James Hall,
with Illustrations from the Original Type Specimens not heretofore
Figured. By R. P. Whitfield. Pp. 39-74, pll. iv-xii. August 10, 1895.
Price, $2.00.

PART III.--The Extinct Rhinoceroses. By Henry Fairfield Osborn. Part I.
Pp. 75-164, pll. xii_a_-xx, and 49 text figures. April 22, 1898. Price,
$4.20.

PART IV.--A Complete Mosasaur Skeleton. By Henry Fairfield Osborn. Pp.
165-188, pll. xxi-xxiii, and 15 text figures. October 25, 1899.

PART V.--A Skeleton of Diplodocus. By Hen