972 The Progress of Arachnology in America, 
` R.—Median anterior eyes diurnal, all the others nocturnal; œ genital article 
shaped, covering the copulatory organ; epigyne of 2 in a. form 
pla te gelenidz, 
Eyes (or, at least, the. four anterior) all diurnal; Qy genital iy laciniate, 
encompassing the copulatory organ; epigyne of 9 provided ace 
S.—M. Jibles (cheli \i ted tically, their second at oie 
internal side; eyes S 6, nocturnal (sub-order, Ar. gnaphos2)........ sé eert 
Mandibles inserted horizontally, their second articles bending longi 
ard; eyes 8, of which two are diurnal (sub-order, Ar. neato 
Eyes fo “coat @ compact BTOUD. 5p issiecesesnnceotrcceens PAT trpela 
Eyes disposed in three separate groupS.......ssecerecessessesersnoessenees 
U.—With a single pair of epigastric stigmata; Q witha calamistrum. FILISTATIDE 
ith two pairs of epigastric stigmata; no calamistrum. s.s...» s... Avic cularia’ } 
The following is a classified arrangement of the principal it 
erature on American spiders, which will summarize what 
been somewhat briefly reviewed above. A few of the most im- 
portant European works are added, as they contain much a 
general value on the subject: 
I. GENERAL. 
ie | 
BARON WALCKENAER.—Histoire Naturelle des Insectes,—Apteres. Tome i. A 
837). 
N. M. Henrz.—Descriptions and Figures of the Araneides of the United sa 
in Four. Boston Soc. Nat. Hist., iv. 54-57, 223-231; 386-396 (1842-44) 
V. 189-202, 352-369, 444-478 (1845-47); vi. 18-35, 271-295 (8h 
printed with other papers in one volume,—The Spiders of the 
8vo. Boston (1875). 
CHARLES GIRARD.—Arachnidians; in App. F to Marcy’s “ Report 
Expedition,” 233-235 I a 
C. G. GIEBEL.—Ueb AOAR Spinnen aus Illinois; in Zeitschrift fir ae 
Naturwissens a 1869, 24 : and 
_ JOHN BLackWALL.—Notice of Sides captured z pigs Hunter in M! if 
anada, with descriptions of species supposed to be new to 
Annals and Mag. of Nat, Hist, (fourth bie viii. 429-436 (1871). 
T. THORELL.—Notice of some Spiders from Labrador; in Prot. Boston Sw 
Hist., xvii. 490-504 (18 1 
——Aranez collected in be in 1875 by A. S. Packard, Jr.» M.D.; P 
U. S. Geol. Survey (Hayden), iii. 477-529 (1877). fae 
J. H. Emerton.—Cave ike ae Virginia; in American Nann 
——Spiders Common to New England and Europe; in Pycha, 1 29° 
—— Structure and Habits of Spiders. 1zmo. Salem (1878). er 
this popular work appear in the “ Annual Report of the peepee 
of Ontario” for 1879, and in vol. ii. of the “ Standard Natural 
of Red Rive 
* Emerton unites this family with the Theridide. rigb i 
* More commonly known in this country as the Mygalidz, oF 
