DESCRIPTION OF GENERA AND SPECIES, Sallipe 
No. 18. Epeira ravilla Kocn, C. Plate V, Figs. 7, 8. 
1845. Hpeira ravilla, Kocu,C..... . Die Arachnid., xi., p. 78, Fig. 890. 
1889. Hpeira ravilla, Marx ...... Catalogue, p. 547. 
Fremate: Total length, 11 mm.; abdomen, 8 mm. long, 7 wide; cephalothorax, 5 mm. 
long, 4 wide; face, 2 mm. wide. General colors, orange yellow and brown for the fore part 
of the body, and whitish yellow (in alcohol) for abdomen. The specimens here described 
from Dr. Marx’s collection were identified by the late Count Keyserling as Koch’s EF. ravilla, 
and after casual examination were drawn and lithographed on the strength of this author- 
ity along with examples of E. bivariolata Cambridge. Subsequently more careful study has 
satisfied me that there is no specific difference between these and the specimens recognized 
by Keyserling as E. bivariolata. I regard it as probable that Koch’s FE. ravilla and Cam- 
bridge’s I. bivariolata are identical, the peculiar blisterlike spots on the lower dorsal field 
haying been overlooked by Koch, or being wanting in his type, as is the case in some of 
Dr. Marx’s specimens. However, I retain here the names and figures as originally engraved, 
and append description. 
CrrHALorHorAx: Corselet well rounded on the sides, truncate and indented at the base ; 
fosse large and circular; head quadrate, depressed from the gently arched base, covered with 
gray bristles; color dull orange yellow with brown marginal bands, the eye space somewhat 
lighter hue and mandibles dark brown. Sternum orange, slightly longer than wide, sternal 
cones distinct, elevated in middle, marginal gray bristles; labium semicircular, maxillee 
gibbous, both dark brown with yellow tips. 
Eyrs: Ocular quad elevated, front width greater than rear and equal to length; MF 
somewhat larger than MR; separated 1.5 diameter, MR by less than one diameter. Side eyes 
propinquate, on decided tubercles, SF a little larger than SR; MF distant from SF about 1.5 
their alignment, MR from SR by a greater space; front row recurved, the longer rear row 
procurved ; height of clypeus about 2.5 diameter MF. 
Leas: 1, 2, 4, 3; stout, especially I, II; orange yellow; femora-I, II, almost entirely 
dark brown to blackish, and about half of femur-IV similarly marked; joints annulated ; 
well armed with white and yellowish spines and gray bristles and hairs; palps of lighter 
hue, with bright yellow wings and strong gray bristles. 
AppomMEN: Oval, contracted both in front and behind; dorsum lightly arched on top, 
rounding thence to the spinnerets directly beneath the high apical wall. The dorsal pat- 
tern, Fig. 7, and on the anterior base, is a rhomboidal patch of whitish yellow color, the 
original hue of which may have been green or bright yellow; surface with stout white 
bristles, with raised brown sockets. In the median line on the lower part of the dorsal 
saddle are two circular blisterlike markings like those in E. bivariolata, separated about two 
mm., the lower one smaller than the upper. The sides are yellow, with lateral streakings 
of dark color. The venter has a chapeau shaped spot of brown surrounded with yellow; 
at the orange colored spinnerets and along the sides bordered by brown. The epigynum, 
Fig. 7a, in the specimen described, probably lacks one moult of maturity; scapus moder- 
ately long and pointed. 
Mate: Fig. 8; resembles the female in color and pattern; length, 8 mm.; cephalo- 
thorax longer and wider relatively than in the female; fosse a longitudinal depression. 
The legs have less prominent bands of black on the femora and are strongly annulated 
throughout; tibia-II much swollen and curved, and armed with stout, brown clasping 
spines arranged in two rows on the side, and one underneath; ordinary spines whitish, 
with brown bases; metatarsus curved, thin, one stout brown spine on the inside near the 
base, two near the apex ; patellar joints long and rather thin; a long brown spur on apex 
of coxa-I; the palpal digit is remarkably developed (Fig. 8a), the corneous processes resem- 
bling those of E. bivariolata. The abdomen clothed at the base with a cluster of long gray 
bristles; circular blisters onthe dorsal apex as in female. 
Distrisution: Texas; a male from El Paso, Isleta, Rio Grande. (Marx Collection.) Dr. 
Marx also locates it in Arizona. It is probably an inhabitant of the entire Pacific Coast, or 
at least the tropical or semitropical sections. Koch’s FE. ravilla was from Mexico. 
