The male and female Andrenas below were mating shortly before captured.  They were two of hundreds of similar Andrena bees feeding on two large cenizo shrubs at Falcon Park.

Andrena - male
Unnamed cenizo specialist

Size:  7.5 mm (male) 

Associated plant:

Cenizo (Leucophyllum frutescens )

Plant family: Scrophulariaceae 

When seen: May 26, 2021
Falcon State Park
Starr County

Male bee -- This is a moderately-small, narrow-bodied Andrena with uninterrupted white hair bands on its abodmen.

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Dorsal view of bee

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Face of bee

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Alternate view of male bee

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Dorsal view of abdomen

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WJPEG-Andrena-M-NBC-#396-Cenizo-Falcon-P

male bee

Andrena - female
Unnamed cenizo specialist 8 mm (female) 

Associated plant:

Cenizo (Leucophyllum frutescens )

Plant family: Scrophulariaceae 

When seen: May 26, 2021
Falcon State Park
Starr County

Female bee

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lateral view

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dorsal view of abdomen

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male bee

Protoandrena (Pseudopnurgus) texana

Size:  7.5 mm (female) 

Associated plant:

Sweet-stem (Aloysia macrostachya )

Plant family: Verbenaceae 

When seen: May 26, 2021
Falcon State Park
Starr County

Female bee

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Dorsal view

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Vertex and front of scutum

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Lateral view

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Rear view

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female bee