No.ms. SOME ARACHNIDA FROM PORTO RICO— BANKS. 225 
PROSTHECLINA ILLUSTRIS Koch. (?) 
Erh illustris Koch, Die Arachn., XIII, 1846, p. 192. 
One male from El Yimque, 2,800 feet, Februaiy 24 (Richmond), 
appears to be this species which Koch described from Porto Rico. 
PROSTHECLINA SIGNATA, new species. 
Male: Cephalothorax red-brown, ej^e region black, both with some 
iridescent scales, a row of g-reen ones above the anterior eyes; mandi- 
))les dark brown; palpi light brown, the patella clothed above with 
shining snow-white hairs; legs j^ellowish brown, their anterior sides 
blackish, unhanded, tarsi nearl}^ white; coxae and sternum pale yel- 
lowish. Al)domen above dark brown; on each anterior side is an 
oblong patch of iridescent scales, and behind, on each posterior side, 
is a circle of iridescent scales, inclosing a jet-black spot; a black spot 
in front of the circle; venter black. 
Female: Cephalothorax pale yellow-brown; eye region black, deepl}^ 
emarginate behind, and there containing a large black spot which, 
tapering behind, is continued as a narrow median stripe to the poste- 
rior margin, the hairs each side of this are glistening white; from 
each dorsal eye there extends backward a broad dark-brown stripe; 
a point of white hair betw^een the anterior eyes above; mandibles 
brown; palpi pale, annulate; legs pale, marked and annulate with 
black, not very plainly on the anterior pairs; sternum and coxje pale 
yellowish. Abdomen brown, with a glistening white line around the 
base; from it, each side, is a submedian white line reaching toward the 
middle of dorsum; behind this on each side is a white circle inclosing 
a black patch; the circle is often extended backward to the spinnerets; 
in front of the circle is another black patch; venter pale, with a 
median brown stripe, and darker marks on the sides. 
Length, male 3.0 mm., female 3.5 mm. 
Several specimens from Utuado, January; Aguadilla, January; and 
Culebra Island, February. 
Order SCORPIONIDA. 
CENTRURUS INSULANUS Thorell. 
Centrnrux iusn'anu.s Thorell, Atti. Soc. Ital., XIX, 1877, p. 148. 
Tw^o specimens: Culebra Island, February 11, and Vieques Island, 
F(>bruary. Known from several West Indian islands. 
- ISOMETRUS MACULATUS De Gear. 
Scorpio mandatas De Geek, Mem. Hist. Ins.. VII, 1778, p. 346. 
Scorpio americanm Herbst, Natursyst. uiigefl. Ins. IV, 1800, p. 60. 
Isometrm filum IlEMPRicn and Ehrenberg, Sym. phys., Scorp., 1828, p. 3. 
lyychas paraensis Koch, Die Arach., XII, 1845, p. 6. 
One specimen from San Juan, February 13 (Stejneger). A common 
cosmotropical species. 
Proc. N. M. vol. xxiv— 01 15 
