SPINTHARUS.—STEMMOPS. 399 
Having compared an example (?) of &. elongatus, Keyserl., with this author’s own 
identifications of S. flavidus (2), and with numerous specimens from Central America, 
I cannot but regard the two forms as identical. The abdomen varies in shape and 
Jength, as well as in the dorsal pattern ; while the vulva appears to vary in form in 
different examples, according to conditions of shrinkage &c. 
The types (3) of S. lineatus and S. affinis are identical, the palpal organs being 
precisely alike in both; but the spine in S. lineatus is more extended, while in 
S. affinis the apical portion is partially concealed beneath the membrane. These 
specimens have the male palpus formed as in Keyserling’s figure of S. flavidus (no 
males occur in his collection), and there is no reason for supposing them to be other 
than the sexual complements of the females occurring in the same collection, so that 
S. lineatus and S. affinis are the males of S. flavidus. 
DIPCENA. 
Dipena, Thorell, Europ. Spid. p. 91 (1869). 
Type D. melanogaster (C. L. Koch). Europe. 
In the type of this genus the colulus is present as a small tubercle with one or two 
bristles set on its apex. The tarsal comb is present beneath tarsus iv. The central 
ocular quadrangle is much wider in front, the posterior centrals being less than one 
diameter apart. The tibiz and protarsi i. and il. are armed with rows of very fine 
long spines on their inner side. 
A single species only, which probably belongs to this genus, has been detected in 
the collection under examination. 
1. Dipena proba. 
_ Dipena proba, O. P.-Cambr. Biol. Centr.-Amer., Arachn. Aran. i. p. 294, t. 37. figg. 9, 9a-d (3), 
10, 10a-c (2 )*. 
Type d, gynetype 2, in coll. Godman & Salvin. Total length, ¢ 1:5, ? 2 millim. 
Hab. Mexico, Teapa in Tabasco (7. H. Smith*). 
STEMMOPS. 
Stemmops, O. P.-Cambridge, Biol. Centr.-Amer., Arachn, Aran. i. p. 125 (1894). 
Atuaulfo, O. P.-Cambridge, loc. cit. p. 178 (1896). 
Mettus, O. P.-Cambridge, loc. cit. p, 292 (1899). 
Type of Stemmops, 8. bicolor, O. P.-Cambr. (dg); of Ataulfo, A. nugaw, O. P.-Cambr. (3); of Mettus, 
M. reclivis, O. P.-Cambr. (@): all three from Mexico. 
The two male type-specimens are identical species, and the female type is most 
probably their sexual complement. 
Posterior central eyes largest ; posterior row slightly procurved; anterior eyes subequal. Clypeus as high as 
the central ocular quadrangle. Tarsal comb present on tarsus iv. Colulus very minute. Sternum 
broadly produced behind. : 
