1985] 
Wilson — Dominican amber ants. 3 
31 
of the specimens were so decayed or poorly positioned that the 
critical characters could not be examined, and in these cases 1 relied 
on size and habitus. 
Diagnosis {worker). A medium-sized member of the alfari 
group distinguished from all known contemporary members of the 
genus, as well as the Dominican amber A. alpha, by the exception- 
ally elongate head of the worker (Cephalic Index about 70-80 as 
opposed to 80 or more in other species). In overall appearance A. 
eumeces is similar to bicolor, fasciata, and theresiae, but in addition 
to possessing somewhat less elongate heads, these living species also 
have more convex lateral sides of the head seen in full-face view, 
with the outer margins of the eyes located well inside the head 
margins. 
The name eumeces is derived from Gr. eumekes, of good length. 
Holotvpe worker. Head Width 0.43 mm. Head Length (from 
line of posteriormost reach of occipital corners to line of center of 
anterior clypeal border) 0.63 mm. Cephalic Index 68, Scape Length 
0.47 mm, Pronotal Width 0.27 mm. In an amber piece from Palo 
Quemado, near Santiago, Dominican Republic. 
Paratype workers. Thirty-eight workers in 6 amber pieces, 
Dominican Republic (no further locality). 
Azteca eumeces, new species 
(Fig. 9) 
A 
B 
Fig. 9. Azteca eumeces holotype worker: A, side view of body; B, head. 
