Key to Proceratium of China

This worker key is based on: [[Media:Xu 2006.pdf| Xu, Z. 2006. Three new species of the ant genera Amblyopone Erichson, 1842 and Proceratium Roger, 1863 from Yunnan, China. Myrmecologische Nachrichten. 8:151-155. PDF]]

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Proceratium

1

 * Anterior margin of clypeus with a triangular projection in the middle. Petiolar node low and inclined backward. . . . . . 2


 * Anterior margin of clypeus almost straight, without a triangular projection in the middle. Petiolar node high and erect. . . . . . 5

2
return to couplet #1
 * Occipital margin weakly convex. Posterodorsal corner of propodeum rounded (see Terayama 1990: figs. 10-11) (China: Zhejiang, Taiwan, and Hunan Provinces; Japan) . . . . . Proceratium itoi


 * Occipital margin straight. Posterodorsal corner of propodeum bluntly angled or toothed. . . . . . 3

3
return to couplet #2
 * Subpetiolar process small and triangular. Dorsum of alitrunk straight (Figs. 8-10) (China: Yunnan Province) . . . . . Proceratium nujiangense


 * Subpetiolar process large and nearly rectangular. Dorsum of alitrunk weakly convex . . . . . 4

4
return to couplet #2
 * Middle projection of clypeus narrow and acute. Posterodorsal corner of propodeum bluntly angled. Posteroventral corner of subpetiolar process acutely toothed (see Xu 2000: figs. 3-5) (China: Yunnan Province) . . . . . Proceratium zhaoi


 * Middle projection of clypeus wide and triangular. Posterodorsal corner of propodeum bluntly toothed. Posteroventral corner of subpetiolar process bluntly angled (Figs. 14-16) (China: Yunnan Province) . . . . . Proceratium longmenense

5
return to couplet #1
 * Occipital margin convex. Posterodorsal corner of propodeum very bluntly angled (see Santschi 1937: fig. 1; Terayama 1985: figs. 1-2) (China: Taiwan Province; Japan) . . . . . Proceratium japonicum


 * Occipital margin straight. Posterodorsal corner of propodeum distinctly toothed (see Karavaiev 1935: fig. 2; Xu 2000: figs. 15-17) (China: Yunnan Province; Vietnam) . . . . . Proceratium longigaster