Female, M. eickworti vs. M. americana | Female, head, length and shape of mandibles | Male, abdomen, S6, shape of rim | Males, abdomen S6, pattern of hair | Sex, number of antennal segments | State or province where bee was collected

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Number scored for a state is in green.

1. State or province where bee was collected    [Explain]

6AL    2AZ    2CA    6CT    6DC    6DE    6FL    6GA    6MA    6MD    4ME    6MS    6NC    4NH    6NJ    6NY    6Ontario    6PA    6RI    6SC    6TN    6VA    4VT    6WV   

2. Sex, number of antennal segments

4Female, 12    4Male, 13   

3. Female, head, length and shape of mandibles

3Mandible equal to or shorter than length of eye, distal half wide and flat with a single tooth below the tip, distal half not shaped like a knife blade    1Mandible longer than length of eye, distal half shaped as a pointed knife blade with two small teeth on inner margin   

4. Female, M. eickworti vs. M. americana

1M. americana - The very large pits of the scutum are spaced much more densely, such that many of these pits are touching each other even in the posterior half, although this density is usually lower posteromedially - In direct comparison, scutellum more densely pitted in the anterior half - Pits on T1 and T2 TOUCHING to nearly touching, separated by less than 1 pit diameter, this most obvious when comparing the basal half of T2 - Pygidial plate with the raised area appearing to resemble a triangle    1M. eickworti - The very shallow yet large pits of the scutum are spaced much more sparsely, such that almost no pits are touching each other and the overall pit spacing appearing to be highly irregular - In direct comparison, scutellum less densely pitted in the anterior half - Pits on T1 and T2 sparse, averaging well more than 1 pit diameter apart, this most obvious when comparing the basal half of T2 - Pygidial plate with raised area appearing irregular, with the base a strongly-convex bump and the apical portion being a raised line which extends towards the apex   

5. Male, abdomen, S6, shape of rim

2Apical rim broadly ROUNDED OUT, lacking a semi-circle shaped indent - If with any type of indent, then a very small v-shaped notch in the center comprising much less than 1/2 the rim    2Apical rim with a semi-circle shaped indent across the middle 1/2 to 2/3 of the rim   

6. Males, abdomen S6, pattern of hair

1Hair APPEARING as three distinct tufts, one apical and two lateral tufts, lateral tufts are, however, continuous with the apical tuft along the rim    1Hair NOT arranged into three distinct tufts, although some apical hairs may be quite a bit longer than hair on the sides    1Hair arranged into THREE DISTINCT TUFTS, one apical and two lateral tufts, lateral tufts are NOT continuous with the apical tuft along the rim