R. robertsi vs R. rotundiceps | State or province where bee was collected

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1. State or province where bee was collected

2AZ    2CA   

2. R. robertsi vs R. rotundiceps

1R. robertsi - The labrum is unmodified near the base - From a frontal view of the head it may be seen that the vertex is flatter and less rounded - The medial ocellus is either in line with or below the top of the eyes - In females there is a smaller amount of appressed, whitish hair present laterally on T5 - In direct comparison this species is larger than R. rotundiceps, usually about 8mm in length    1R. rotundiceps - The labrum is transversely ridged near the base - From a frontal view it may be seen that the vertex is about evenly rounded throughout, rising above the ocelli as a result - The medial ocellus is found just above the top of the eyes - In females there is a larger amount of appressed, whitish hair present laterally on T5 - In direct comparison this species is smaller than R. robertsi, ranging about 5-6mm in length