IS94-] 239 [Morse. 
infuscation externally distad of the pale annulus, are rnrely ringed 
with fuscous as in bolli ; this, however, thougli helpfid, is not a 
safe character upon which to determine the species. 1 liave seen 
a specimen of saxatile which showed there a complete though 
slight fuscous annulation. 
In COLOR saxatile presents much more contrast than bolli, the 
markings being blacker and the ground-color paler in hue with 
more or less white. Saxatile lacks the lilaceous tint of holli 
wliich may even becotne bright reddish brown. 
5. — S. ocidatum vs. S. saxatile. 
Oculatum may be readily distinguished from saxatile in sevei-al 
ways : — 
The species is smaller, the 9 'ibout equaling saxatile ^ ; the 
eyes are larger and more prominent. 
The PRONOTUM offers the best characters. It is very acute 
posteriorly in oculatum, the sides of the posterior process exca- 
vate ; in saxatile very nearly or quite rectangular, the sides 
straight. In oculatum the median carina is high and arched, 
especially on raetazona, the incision oblique and notch even fenes- 
trate ; in saxatile low, especially on posterior half of metazona, 
rather sinuous, the incision nearly vertical, the notch open. 
In ocidatum on the inner side of the hind femora the proximal 
two bands are not connected, and the proximal one is obsolete in 
tibial groove ; in saxatile these bands are usually broadly con- 
nected, appearing from below almost like a single fascia. 
Oculatum is much more pubescent, and the color is different, 
yellowish brown predominating, as compared with blac-kish 
fuscous and ash-gray in saxatile. 
6. — S. oculatum vs. S. bolli. 
Oculatum is smaller in size than bolli, the 9 of oculatum about 
equaling the $ of bolli. 
In oculatum the head is much less compressed ; the eyes are 
larger and more prominent; the vertex is much broader, less 
advanced, and more declivent ; the facial costa is broader, and 
its ]irofile more rounded at meeting with the vertex. 
In oculatum the pronotum is very acutely angled behind, the 
median carina high and arched, less compressed at base on the 
posterior half of prozona ; the incision oblique, the notch even 
fenestrate ; while in bolli the pronotum is nearly or quite rectan- 
gular behind, the carina is only of moderate height with its 
