Abdomen, T1, hair color on the dorsal face - This includes very short hairs | Abdomen, T2, hair color on the DORSAL face - This does not include hairs found on the lower edge of the sides | Abdomen, integumental color, NOT hair color - Note, if more than one feature is present then pick whichever is dominant | Body length in mm, when measured from tip of abdomen to front of head | Head, clypeus, presence and form of light integumental markings | Head, mandible, integumental color - NOT counting the golden smear often present at the very tip | Head, mandibles, number of teeth - Note that does NOT include the tiny tooth-like bump which arises from the end of a ridge at about the midpoint of the mandible - Such a tooth should only be scored as present if it is within the apical half and clearly pointed in the form of a functional tooth | Head, paraocular area, integumental color | Head, vertex, hair color | Rear leg, tibia, scopal hair color | Species POTENTIALLY found in the United States - Some species in this guide currently have no US records but are included due to their proximity | Species not scored for this guide yet - Note, 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.
Navigate with above index or scroll bar.

Number scored for a state is in green.

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

3Display species not scored    29RECOMMENDED - Remove these species from the guide   

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

1AL    1AR    27AZ    9Aguascalientes    12Baja California    9Baja California Sur    13CA    2CO    7Campeche    12Chiapas    13Chihuahua    6Coahuila    14Colima    12Durango    3FL    1GA    12Guanajuato    14Guerrero    7Hidalgo    15Jalisco    2KS    1LA    1MS    13Mexico    15Michoacan    12Morelos    16NM    7NV    15Nayarit    8Nuevo Leon    3OK    15Oaxaca    1Ontario    14Puebla    11Queretaro    6Quintana Roo    7San Luis Potosi    16Sinaloa    27Sonora    8TX    11Tabasco    7Tamaulipas    10Tlaxcala    4UT    13Veracruz    6Yucatan    13Zacatecas   

3. Species POTENTIALLY found in the United States - Some species in this guide currently have no US records but are included due to their proximity

32Display all species    23Remove the species for which there are no confirmed US records   

4. Subgenus

5Centris    3Heterocentris    24Paracentris   

5. Body length in mm, when measured from tip of abdomen to front of head

19    510    911    1312    1713    2114    2315    2216    1717    1318    1019    920    521    422    323    224   

6. Head, mandibles, number of teeth - Note that does NOT include the tiny tooth-like bump which arises from the end of a ridge at about the midpoint of the mandible - Such a tooth should only be scored as present if it is within the apical half and clearly pointed in the form of a functional tooth

73    224    65   

7. Head, mandible, integumental color - NOT counting the golden smear often present at the very tip

81. Almost entirely light - Light areas OPAQUE, solidly yellowish or whitish, usually only with the tip a darker brownish or black    82. Partially light - The integument is primarily dark but portions of which appear significantly lightened, these vaguely transluscent areas lightened and varying from light brown to amber in coloration, or sometimes even reddish, this color NOT appearing solid as in the opaquely light state    173. All black - Integument opaque and uniformly black   

8. Head, clypeus, presence and form of light integumental markings

151. Entirely dark - Dark brown to blackish    82. Primarily dark - There is some light integument present on the clypeus, usually taking place primarily in the bottom half, but it takes up less than half the total area    73. Primarily light - There is a splotchy, often nearly symmetrical patch of light integument found covering most of the rim and middle of the clypeus such that the majority of the clypeus is light, with the dark integument bordering the sides and area near the border with the supraclypeus    34. With two large, lateral yellow lobes coming from the side of the clypeus which nearly meet in the middle, in the rare instance where the two lobes touch there is still a clear constriction between them    35. Entirely light - Usually whitish or yellowish, but sometimes reddish   

9. Head, paraocular area, integumental color

181. Absent - Paraocular area completely dark    92. Present, limited - There is a small patch of light integument present at the base of the paraocular area, this patch usually never surpasses the midpoint of the length of the clypeus    123. Present, extensive - The light integumental markings in the paraocular area extend past the top of the clypeus or nearly so   

10. Head, vertex, hair color

131. All light - Whitish to yellowish, sometimes slightly darker near the ocelli, although this slightly darkened area is still nowhere near blackish - Note that sometimes there may be very few short, blackish hairs present near the ocelli    92. With a darker patch directly behind the ocelli - The hair directly behind the ocelli is brownish, in direct contrast to the lighter whitish or yellowish hairs along the back of the head    123. Mixed light and dark - With definitively DARK brown or black hairs present in appreciable numbers BUT not dominant    114. Primarily dark - Most or all hairs are a darker brownish to black color   

11. Thorax, scutum, hair color

221. All light - The hairs are whitish to yellowish or sometimes a light tan brown, note that at time the very TIPS of the hairs may appear slightly darkened while the rest of the hair is light - Few or no dark hairs present    32. All hairs MODERATELY light- The hairs of the scutum are orangish-brown, sometimes appearing somewhat reddish - This state is best viewed without a microscope, so long as one has already been used to confirm there are no intermixed blackish hairs - Also beware that in old individuals with tattered wings the hair may have significantly faded    63. All dark - The hairs of the scutum are all black or a very dark brown, with few if any lighter hairs   

12. Thorax, mesepisternum, hair color

131. All light - If any dark hairs are present they are extremely limited, found only at the very bottom of the mesepisternum OR in very few species they are limited to right near the pronotal lobe    72. Primarily light - The light hairs are clearly dominant but the lower half of the mesepisternum has a significant degree of darker hairs intermixed or invading    83. Mixed, hard to tell what is dominant - There are roughly equal amounts of light and dark hair either intermixed, or with one on top and the other below    74. Primarily dark - The dark hairs extend upward from the bottom of the mesepisternum and past halfway, restricting the lighter hairs to a patch in about the top fourth of the mesepisternum    85. All dark - If with any light hairs then they are restricted to the very top of the mesepisternum and do not form a distinct patch   

13. Rear leg, tibia, scopal hair color

221. All black    42. Primarily black - But with a well-defined patch of light hairs extending from the basitibial plate down the tibia far enough that they are almost always evident even without a microscope    53. All light or nearly - Whitish to yellowish, with few if any darker hairs   

14. Abdomen, T1, hair color on the dorsal face - This includes very short hairs

91. All light - The hairs are pale, whitish to yellowish    162. Mixed light and dark hairs - With yellow hairs found along the base and blackish hairs found along the apical rim    83. All dark - Note that often there may be some degree of light hair present on the vertical face of T1 which faces the propodeum   

15. Abdomen, T2, hair color on the DORSAL face - This does not include hairs found on the lower edge of the sides

241. All dark    82. Mixed light and dark - There are both light and dark hairs present on T2, although they may be very short and somewhat hard to identify as a result    63. All light   

16. Abdomen, integumental color, NOT hair color - Note, if more than one feature is present then pick whichever is dominant

221. Black to dark reddish brown    82. With very strong METALLIC BLUE tinting, although in later terga this may be obscured by hairs    33. Strongly reddened - Either entirely or primarily an orangish-red color    24. Light integumental markings - With extensive yellowish markings on the terga