1987] 
Baroni Urbani & Wilson — Fossil Leptomyrmecini 
5 
Figure 2. Leptomyrmecine male from the Dominican amber tentatively asso- 
ciated with Leptomyrmex neotropicus. 
convex (as opposed to concave) prothorax, lacks the radial cell, and 
has more fully developed, denticulate mandibles. The mandibular 
form of L. neotropicus is shared with L. erythrocephalus and L. 
nigriventris among living species. L. fragilis has thinner, strap-like, 
toothless mandibles; this trait is shared by cnemidatus, darlingtoni, 
mjobergi, pallens, tibialis, varians, and wiburdi among the extant 
Leptomyrmex. 
Discussion 
The leptomyrmecine male, whether Leptomyrmex neotropicus or 
not, may be sufficiently different from the living Leptomyrmex and 
Sicilian amber Leptomyrmula to warrant separation as a distinct 
genus. However, we do not believe it prudent to take this step until 
enough material has accumulated to make the worker-male associa- 
tion more probable, and to better estimate the extent of variation 
in both castes. 
