310 CALIFORNIA ACADEMY OF SCIENCES  [Proc. 4TH SER. 
transverse, no longer than the first; fifth and following quad- 
rate except the last which is twice as long as thick. Thorax 
of nearly even width, four times as long as broad except where 
the mesopleurz project at the sides, propleurz not visible from 
above; pronotum shagreened, twice as long as wide and slightly 
narrowed from its posterior angles to the neck. Mesonotum 
shagreened, rounded behind, two-thirds as wide as pronotum; 
axille (metanotum) triangular on the sides, meeting medially 
aS a narrow band; propodeum with the sides nearly parallel, 
very slightly constricted near the base, declivous on its pos- 
terior third, its surface more coarsely shagreened than the 
mesonotum. Pleurze shagreened, the propleura nearly smooth; 
mesopleura strongly protuberant. Abdomen smooth and shin- 
ing, over twice as long as the thorax; with a few scattered whit- 
ish hairs laterally toward apex; first segment semicircularly 
rounded at apex; following ones with the margins straight; 
second and third subequal, each half wider than long; follow- 
ing growing shorter, apex acute. Legs stout, the middle tibiz 
faintly denticulate, but not spinulose; claws slender, simple. 
Described from six specirnens, taken under a stone in a 
colony of Prenolepis (Nylanderia) fulva Mayr, subsp. nesiotis 
Wheeler on James Island, Galapagos at an altitude of 2000 ft. 
This species is very similar to the other members of this 
cosmopolitan genus which is already known from many oceanic 
islands as well as from the continental areas. In the form of 
the head, eyes and thorax it seems to be most closely related to 
S. sidneyanum Westwood. - 
Holotype, No. 462, female, and one paratype, female, 
Museum California Academy of Sciences, and 4 paratypes in 
author’s collection. 
