3. a) Body large (> 20 mm), mesosoma with yellowish-brown pubescence (Figure 5a); clypeus very narrow medially, less than 1/4 as wide as long, leaving a large space visible even when mandibles are closed (Figure 6a) ..... M. (Callomegachile) sculpturalis Smith

b) Body smaller (< 14 mm), pubescence white (Figure 5b); clypeus much wider medially, unmodified (Figure 6b) ..... 4
Figure 1a
Figure 1b

Figure 5a: Mesosoma with yellowish-brown pubescence
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Figure 5b: mesosoma with white pubescence
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Figure 2a
Figure 2b

Figure 6a: Clypeus very narrow medially
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Figure 6b: Clypeus much wider medially, unmodified
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