1930 ] 
Ant-like Spiders of the Genus Myrmarachne 209 
10. Fang with one (or two) teeth 11 
Fang without tooth 12 
11. Fang with one long, and one very short or indistinct 
tooth ; teeth on lower inner edge large, cephalothorax 
only slighted indented back of eyes chapmani 
Fang with one short tooth ; inner teeth on lower side 
small; cephalothorax deeply indented back of eyes 
piercei 
12. Fang plainly sinuous; cephalothorax moderately in- 
dented, inner row of teeth even (not one missing), 
outer edge of fang-groove with row of distinct teeth 
seriatis 
Fang evenly curved, no row of distinct teeth along 
outer edge of fang-groove 13 
13. On lower inner edge one tooth skipped, fang not con- 
stricted near tip, nor wrinkled, cephalothorax only 
slightly cut behind eyes, larger species bakeri 
On lower inner edge no tooth skipped, all at subequal 
distances apart, fang wrinkled beneath and con- 
stricted before tip, cephalothorax more deeply cut 
back of eyes, smaller species nigella 
Myrmarachne bidentata sp. nov. 
Fig. 4 
Cephalothorax dark red-brown, jaws red-brown, dorsal 
shield of abdomen dark red-brown, rest of abdomen brown ; 
legs yellow-brown, tarsi 3 and 4 pale and coxse 1 very 
pale. Cephalothorax but little indented back of eyes, only 
about the height of third eyes ; eyes of second row as near 
third as to A. S. E. and higher up. Jaws heavy, shorter 
than the cephalothorax, seen from side convex above and 
below, sides transversely wrinkled from above rather 
broadest on apical third, outer edge with two prominent 
teeth, the apical one usually more blunt than the basal, 
the edge between sometime slightly concave, lower inner 
edge with a rather large apical tooth and about three before 
