Pogonomyrmex

Johnson, Robert A. & Cover, Stefan P., 2015, A taxonomic revision of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae) on Hispaniola, Zootaxa 3972 (2), pp. 231-249 : 248

Key to workers for species of Pogonomyrmex on the island of Hispaniola

1 Dorsum and sides of mesosoma and posterior surface of petiolar node with coarse, regular to weakly irregular, subparallel, longitudinal rugae ( Figure 6 )......................................................................... saucius

- Dorsum and sides of mesosoma rugoreticulate to vermiculate; posterior surface of petiolar node mostly smooth, granulatepunctate to rugoreticulate, but lacking subparallel longitudinal rugae ( Figures 1 , 2 , 9 )............................... 2

2 Small (HW = 0.90–1.17 mm); posterior surface of petiolar node viewed from behind and above broadly fan-shaped and about as wide as long; in dorsal view, petiolar node about as wide as postpetiolar node (PW/PPW = 0.87–1.03); anterior surface of petiolar node mostly smooth and shining, forming a noticeably obtuse angle with peduncle of petiole; dorsum of postpetiole and first gastral tergum smooth and shining to partly or completely punctate, weakly shining..................... schmitti

- Larger (HW = 1.11–1.35); posterior surface of petiolar node viewed from behind and above elongate, clearly longer than wide; in dorsal view, petiolar node notably narrower than postpetiolar node (PW/PPW = 0.78–0.90); anterior surface of petiolar node partly to completely sculptured, dull to weakly shining, forming a right to weakly obtuse angle with peduncle of petiole; dorsum of postpetiolar and first gastral tergum strongly punctate, dull....................................... aterrimus

Figures

FIGURE 1. Photograph of Pogonomyrmex aterrimus Wheeler lectotype worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT 0217240). Photographs by Erin Prado from www. antweb. org.

FIGURE 2. Photograph of Pogonomyrmex “ darlingtoni ” Wheeler lectotype worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT 0217241). Photographs by Erin Prado from www. antweb. org.

FIGURE 6. Photograph of Pogonomyrmex saucius Wheeler & Mann worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (MCZ-ENT 00511548). Photographs by Michele Esposito from www. antweb. org.

FIGURE 9. Photograph of Pogonomyrmex schmitti Forel worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT 0103066). Photographs by April Nobile from www. antweb. org.