Abdomen, T1, hair color | Abdomen, T2, hair color ON THE DORSAL FACE, ignoring the sides | Abdomen, T5, hair color | Abdomen, presence and form of light-colored apical hair bands - Make note that specimens with matted hairs should not be scored for this character | Abdomen, terga, presence or absence of pale, OPAQUE integumental markings rather than a simple lightening due to translucence of the integument as is often seen along the rim | Head, antennae, length of F1 | Head, clypeus, integumental color | Head, mandible, integumental color on the outer, most visible, face - This is measured in length along the mandible rather than total proportion yellow - Disregard the golden smear often present at the very tip of the mandible | Head, vertex, hair color | Rear leg, femur, hair color | Species not scored for this guide yet - Do not click either state of this character if you wish to include ALL species | State or province where bee was collected | Subgenus | Thorax, mesepisternum, hair color | Thorax, scutum, hair color

Check boxes for all that apply. If uncertain, skip character or select several states. Then click on any search button.
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Number scored for a state is in green.

1. Species not scored for this guide yet - Do not click either state of this character if you wish to include ALL species

5Display species not scored    27RECOMMENDED - Remove these species from the guide   

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

1AL    1AR    25AZ    9Aguascalientes    11Baja California    11Baja California Sur    13CA    2CO    7Campeche    12Chiapas    12Chihuahua    6Coahuila    13Colima    12Durango    3FL    1GA    12Guanajuato    14Guerrero    8Hidalgo    15Jalisco    2KS    1LA    1MS    13Mexico    15Michoacan    11Morelos    15NM    7NV    15Nayarit    8Nuevo Leon    3OK    15Oaxaca    14Puebla    12Queretaro    6Quintana Roo    7San Luis Potosi    16Sinaloa    26Sonora    8TX    11Tabasco    7Tamaulipas    10Tlaxcala    4UT    13Veracruz    6Yucatan    13Zacatecas   

3. Subgenus

5Centris    3Heterocentris    24Paracentris   

4. Head, mandible, integumental color on the outer, most visible, face - This is measured in length along the mandible rather than total proportion yellow - Disregard the golden smear often present at the very tip of the mandible

171. Primarily yellow - The majority is yellow but roughly the apical third is dark    112. With some yellow - The base of the mandible is all yellow but the light color does not extend past the midpoint of the length of the mandible    123. All dark - Lacking OPAQUE light integument   

5. Head, clypeus, integumental color

181. All yellow - However, sometimes a very small amount of black intrudes from the tentorial pits    72. Nearly all yellow - The only black portions of the clypeus are found at the top of the clypeus, lateral to the yellow markings that reach the supraclypeus medially    63. Primarily yellow but dark near supraclypeus - The majority of the clypeus is yellow or pale-colored including the rim, but the upper half of the clypeus contains dark integument which runs over the top of the clypeus and partially down the sides as a continuous bar    24. Primarily yellow with dark areas at rim and base - The apical rim and the base of the clypeus have dark integument, SOMETIMES with the yellow portion greatly restricted largely to a medial line or block    45. All black or nearly so, if with any yellow then it is just barely present on the apical rim but not on the main area of the clypeus above   

6. Head, antennae, length of F1

61. Short - Shorter than F2-3 combined    82. Moderate - As long as or SLIGHTLY longer than the combined lengths of F2-3    193. Long - About equal to the combined lengths of F2-4 or longer, sometimes SLIGHTLY shorter   

7. Head, vertex, hair color

161. All light - With only yellow to off-white hairs    182. Primarily light - With some limited dark hairs present    73. Intermixed - There are roughly equal amounts of light and dark hairs    64. Primarily dark - There are more dark hairs than light hairs    55. All dark   

8. Thorax, scutum, hair color

191. All light, yellow to white - With only yellow to off-white hairs, sometimes a light yellow-brown tan color about the same as those hairs of the mesepisternum    72. All light, orange to brown - Deeply orange or brown at least in part, clearly darker than the hairs of the mesepisternum if they are light BUT not dark brown or blackish    33. With SOME dark hairs - Ranging from few dark hairs to primarily dark hairs, BUT always with at least some light hairs present    44. All dark   

9. Thorax, mesepisternum, hair color

201. All light - With only yellow to off-white hairs visible from the side, sometimes with darker hairs hidden ventrally    82. Primarily light - With some limited dark hairs present, often ventral, although they can be seen from the side    43. Intermixed - There are roughly equal amounts of light and dark hairs    84. Primarily dark OR all dark - There are more dark hairs than light hairs   

10. Rear leg, femur, hair color

101. All light - With only yellow or off-white to light brownish hairs    122. Intermixed - With both light and dark hairs present    123. All dark   

11. Abdomen, presence and form of light-colored apical hair bands - Make note that specimens with matted hairs should not be scored for this character

221. Absent - No apical hair bands, hair color either intermixed thoroughly or hairs completely and uniformly cover the tergite without a clear increase in density along the rim    52. APPEARING present due to appressed hairs and or integumental color - Although all hairs on the tergites are light, those along the apical rim are prone and appressed such that they appear thicker like hair bands - Hair bands may also appear to be present due to lighter integument along the rim - Note that this type of presence is most obvious when viewed without a microscope    23. Present - There are darker hairs basally and lighter hairs for a clear band along the rim - Even if the rim is lighter or the hairs there are more appressed you should score for only this character if it fits   

12. Abdomen, terga, presence or absence of pale, OPAQUE integumental markings rather than a simple lightening due to translucence of the integument as is often seen along the rim

21. Extensive - There are pale markings on more than just T2, these markings may or may not be continuous across any particular tergite    22. Present on T2, weak - There are pale marks on ONLY T2 and these markings are interrupted medially    233. Absent - No light integumental markings are present   

13. Abdomen, T1, hair color

161. All light - With only yellow to off-white hairs    162. Primarily light - With some limited dark hairs present    83. Intermixed - There are roughly equal amounts of light and dark hairs    74. Primarily dark - There are more dark hairs than light hairs    35. All dark   

14. Abdomen, T2, hair color ON THE DORSAL FACE, ignoring the sides

71. All light - With only yellow to off-white hairs    92. Intermixed - With both light and dark hairs present    193. All dark   

15. Abdomen, T5, hair color

131. All light    62. Primarily light - With dark hairs only found at the lateral sides    33. Intermixed light and dark hairs throughout - Hard to tell which is dominant    134. All black or nearly so - If with any light hairs present then they are far outnumbered by dark hairs