214 AMERICAN SPIDERS AND THEIR SPINNINGWORK. 
CrpHaLotHorax: Corselet irregular oval, truncated behind; the median fosse deep, 
“cephalic suture well marked; corselet grooves distinct; color yellowish brown, with a yellow 
marginal band; in some specimens lighter streaks of yellow mark corselet grooves and 
caput; skin glossy and slightly pubescent; head on a level with or slightly above the 
corselet; color yellowish brown, uniform with corselet and mandibles. The sternum is 
shield shaped, about as wide as long; blackish or dark brown, slightly pubescent; skin 
hard and glossy; labium subtriangular, colored like the sternum; the maxille wide as long, 
and rounded at the tip. 
Eyres: Ocular quad on a black prominence; narrower in front than behind, sides 
slightly longer than rear; the eyes are set on black rings; MR slightly larger than MF; 
MF separated by about 1.5, MR by one diameter; side eyes on tubercles, not very pro- 
nounced; propinquate; SF somewhat larger than SR. The clypeus height about®two 
diameters MF; front eye row well recurved, the longer rear row slightly procurved or 
aligned. 
Leas: 4, 1, 2, 3; yellow, with slight brown apical annuli; armed with bristles and 
short bristlelike spines, and are rugose, particularly upon the femora; palps colored and 
armed as the legs. 
Aspomen: Somewhat an irregular oval, wider behind than in front, widest in the middle; 
the posterior is armed at the dorsal edges with strong but not long spinal processes, and 
immediately beneath these are similar but smaller processes. The color is yellow, with a 
folium of blackish color, interrupted in the middle. Several curved rows of circular brown 
spots cross the dorsum, modifying the color, some bowed to the front and some to the 
rear; similar spots are on the sides and underneath. The dorsum is reticulated, and is 
glossy and hard; the spinnerets are placed well underneath, the venter is yellow, the spin- 
nerets brown, as well as the space surrounding the gills and-epigynum. The epigynum 
(Fig. 6 front view, 6b side view) shows anteriorly a brown chitinous atriolum and a scapus 
bent and blunt at the tip. Underneath the scapus and dividing the postule is what may 
be called a secondary scapus, wide at the base and somewhat rounded at the tip. 
Mate: Figs. 7, 7a, 7b. The male does not differ widely from the female in coloring and 
markings. The apex of the abdomen is rounded, and is destitute of spinal processes. Its 
size is a little more than half that of the female, being 3 mm. long. 
Distrisution: The geographical distribution appears to correspond closely with that of 
its congeners, A. gracile and A. sagittatum. It has been collected throughout the New 
England States, in New York, Pennsylvania, Maryland, District of Columbia, Virginia, 
North Carolina, Georgia. I have specimens from Ohio, and as far to the north and west 
as Wisconsin. Its distribution west of the Mississippi has not been determined, and it is 
probably limited by the Rocky Mountains. 
- 69. Acrosoma sagittatum (WaLcKENAnR). Plate XXIII, Figs. 8, 9. 
1837. Plectana sagittata, WALCKENAER . Ins. Apt., ii., p. 174; Appnot, G. S., No. Vv 
1850. Hpeira spinea, Hentz. .... . J. BoS, Vin Po 25 Sp, Ueki, p. 128) xv. 9: 
1884. Acrosoma spinea, Emprron . . .-N. E. Ep., p. 326, xxxviii., 5-8. 
1888. Acrosoma sagittata, McCook . . . Proceed. Acad. Nat. Sci., Phila., p. 5. 
1889. Acrosoma sagittatum, Marx .. . Catalogue, p. 540. 
FremaLe: Total length, 9 mm.; abdomen, 4.5 mm. long from base to apex at the 
median line, 7 mm, long from base to tips of posterior spines; width, 4 mm.; cephalo- 
thorax, 3 mm. long and 2 mm. wide. 
CrrHatornorax: A long oval, rounded, slightly indented at the base, the posterior 
half raised instead of depressed; the fosse distinct, as are also the corselet grooves; the 
margin somewhat rimmed or turned up; caput elevated; cephalic sutures distinct; the 
head rather stumpy and wide at the face. Color yellow or orange brown, with darker 
streakings on the sides; a marginal rim of yellow surrounds the corselet, with a wider dark 
