1985] 
Wilson — Dominican amber ants. 3 
23 
Fig. 4. Hypodinea primitive! worker holotype: A, side view oi body; B, dorsal 
view of body; C, head. 
Holotype worker. Head Width 0.68 mm. Head Length 0.93 
mm, Pronotal Width 0.56 mm. Scape Length 0.87 mm. Eye Length 
0.26 mm. Posterior half of head bearing scattered foveae with the 
interspaces weakly shagreened and feebly shining. Rest of the body 
uniformly and lightly shagreened and feebly shining. Body uni- 
formly light reddish brown. Dominican Republic amber: no further 
locality. 
Paratype workers. Four workers: 2 in one amber piece from La 
Toca, associated with Azteca alpha workers (Head Width of one 
0.64 mm, other not measured); two others in separate pieces origi- 
nating from unknown localities (one with Head Width 0.66 mm, 
other not measured). 
Azteca and Iridomyrmex 
The large and complex genera Azteca and Iridomyrmex have 
proved difficult to separate in their entirety by means of external 
anatomy (a striking difference in the proventriculus makes the 
cleavage easier when this internal organ can be examined). The 
classification of fossil material is therefore difficult, since only 
external structures are usually preserved. 
