המועדפים של morcutt

I think, but will check voucher. Big and bidentate, with spots on t2 and t3. Also seemed to me that maculae on tergites are rather pale & not as yellow as maculata. We definitely picked up some Melandrena here - if we got any that weren't carlini, they would've been vicina or nivalis (can check)

Oro Vista Park
Definitely one of the coolest bees I've ever seen. There were a few of these on the phacelia. I didn't check all the different phacelia plants for them but one of the plants had several on them.

Lasioglossum (Dialictus) pilosum (Smith)

CANADA, ON Ancaster

43.2160°N, 80.0174°W

24.ix.2014, S.Irazuzta

MACBio20140924.3.35

Lasioglossum pilosum ♂

From Gibbs 2010

Male L. pilosum can be recognised by head long (length/width ratio = 1.13–1.17); eyes strongly convergent below (UOD/LOD ratio = 1.35–1.64); clypeus yellow distally; mesoscutal punctures very dense, contiguous medially; metapostnotum rugoso-carinulate; and metasomal terga metallic, punctures dense and distinct. They are most similar to L. floridanum, L. leucocomum and L. succinipenne. Male L. floridanum have weak metapostnotal rugae and usually lack a clypeal maculation. Male L. leucocomum have sparser mesoscutal punctures medially. Male L. succinipenne have punctures visible on the mesepisternum.

Tumamoc Hill, The Desert Laboratory, The University of Arizona, Tucson, AZ.

Historically, the eastern creosote bush flats (between two washes) has been rather consistently the nesting aggregation and emergence sites of Centris pallida for decades.

I saw metanders (large male morphs) at this site again on May 10, 2023 searching for micro sites to dig for females. However, this was not a good year. Some years, this area (perhaps 10 hectares) contains many thousands, even tens of thousands, of searching and patrolling males, mating pairs and nesting females.
Meghan Barrett conducted some of her C. pallida thermal biology Ph.D. studies (Drexel Univ.) here in 2018 and 2019. Buchmann has also worked onsite with cinematographer Keith Brush to film mating behavior, and with still photographer Dr. Bruce Taubert.

Historical (recent) bee emergence dates at this TH site have been:
14 April - 8 May 2016
24 April - 4 May, 2018
13 April - 29 April, 2019

Climate change:
Interestingly, Centris pallida emergence dates (Tumamoc Hill, Blue Pt. Bridge recreation area along the Salt River) in the 1970's and 1980's were strongly at the tail end of April, or early May. Today, we expect to see these bees emerging about 10 days earlier.

*Note- photographs of Centris pallida adults and brood cell courtesy of Dr. Bruce Taubert. Please DO NOT reuse without permission.

I saw this bee sitting in the middle of a lily flower all day, rubbing all over the stamens. Since I couldn't see it very well, I actually thought it was a honeybee that couldn't climb back up (we get a lot of injured and sick ones around here), so I tipped it over to free it. Once out, it went absolutely NUTS, and was obsessed with the flashlight. I was able to finally guide it back to its flower using the light, and it seemed content again.
Link to bugguide id: https://bugguide.net/node/view/2257867#3656662