Abdomen, S6, shape | Abdomen, T1, hair on sides and shoulders of top surface | Abdomen, T1, presence or absence of a uniform band of short hair on the edge at the base of the segment | C. sayi vs all, clypeus rim | Head, mandibles, type and pattern of hair | Legs, color | State or province where bee was collected | Subgenus | Thorax, metanotum, presence and pattern of bright white, thick, short matted hairs | Thorax, scutellum, presence and pattern of bright white, thick, short-matted hairs on the narrow rear vertical surface just above the metanotum | Thorax, scutellum, shape of rim and pattern of pits

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Number scored for a state is in green.

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

14AL    11CT    16DC    15DE    16FL    19GA    16IL    15IN    15KY    12MA    17MD    10ME    10MI    13MS    20NC    9NH    16NJ    18NY    5New Brunswick    1Newfoundland and Labrador    6Nova Scotia    17OH    11Ontario    16PA    1Prince Edward Island    10Quebec    11RI    19SC    16TN    17VA    9VT    11WI    17WV   

2. Legs, color

17Femur and tibia orange to reddish-orange similar in color to tarsal segments    13Femur and tibia reddish-brown, brown, or black in contrast to lighter tarsal segments   

3. Thorax, scutellum, presence and pattern of bright white, thick, short-matted hairs on the narrow rear vertical surface just above the metanotum    [Explain]

10Absent    17Present   



4. Thorax, metanotum, presence and pattern of bright white, thick, short matted hairs    [Explain]

13Absent    4Present evenly across half or more of the section    15Present only or dominantly in the center of section   




5. Thorax, scutellum, shape of rim and pattern of pits

1Distinct median SPINE present - Surface COARSELY pitted    1Evenly convex, WITH a longitudinal median ridge - Surface COARSELY pitted    20More or less evenly convex - Surface COARSELY pitted, LACKING a longitudinal median ridge    1Rim forming an obtuse triangle, an angle versus a concave surface - Surface largely UNPITTED   





6. Abdomen, S6, shape

1Apex tri-dentate and narrowed from segment base    1Appearing as a long, parallel-sided, straight spine set upon rounded shoulders, a fan of hairs as long as the spine occur on either side of the spine spreading to the edge of the shoulders    7Appearing as an elongate triangle set upon rounded shoulders    10Narrowing toward the tip with small, possibly minute, teeth present just below the tip on the rim    6Sides evenly convex, narrowing toward the apex, appears like half of an ellipse   






7. Head, mandibles, type and pattern of hair

1180-100% of basal 3/4 obscured by short, dense, white, matted hairs    17Lacking hair or with thin, tan or black hairs that do not greatly obscure the surface, if with any white hair, then present only at the base   

8. Abdomen, T1, presence or absence of a uniform band of short hair on the edge at the base of the segment

11Absent, but may have very sparse, erect, long hairs that appear to create a loose band    12Present and complete, hairs APPRESSED, THIN and not longer than hairs in the apical hair band    6Present, hairs MATTED, may or may not be interrupted medially   




9. Abdomen, T1, hair on sides and shoulders of top surface

18All hairs short and matted and appressed    12Hairs on sides short and matted, hairs on shoulders unmatted, longer and thinner    4No hair present   




10. C. sayi vs all, clypeus rim    [Explain]

1C. sayi - Clypeus clearly indented in the center, the rim forming 2 evenly curved lobes, visible even when hair covers the entire clypeus, the lobes very slightly elevated at their ends above the rest of the surface    22Others - Not as stated above   



11. Subgenus

1Acrocoelioxys    1Allocoelioxys    7Boreocoelioxys    3Coelioxys    2Cyrtocoelioxys    1Glyptocoelioxys    1Haplocoelioxys    1Neocoelioxys    3Synocoelioxys    3Xerocoelioxys