Identification Page #12

Calliopsis, Perdita, Andrena,

Osmia, Megachile

May 2021

Ashmeadiella, Dianthidium
Calliopsis, Triepeolus


Ashmeadiella maxima  (male)

Size:  8 mm

Associated plant:

(Ziziphus obtusifolia )

Plant family: Rhamnaceae  

When seen: May 11, 2021

Chihuahua Woods Preserve
Mission, Hidalgo Co., TX

Male bee

Face of male bee


Dorsal view of bee

Vertex & scutum

Close-up of vertex

male bee

Ashmeadiella cactorum cactorum

Size:  8.5 mm (female) 

Associated plant:

Texas palo verde
(Parkinsonia texana)

Plant family:  Fabaceae  

When seen: May 9, 2021

La Puerta Tract
Near  Rio Grande City, Starr Co., TX

Female bee

The bee measures a little more than 8 mm

Dorsal view of bee


female bee

This was one of twelve bee species I saw  feeding on a single Texas palo verde bush at noon in 100-degree heat.  This is in a dry area with sandy soil.  The dominant vegetation in bloom in the area consisted of palo verde, lotebush, guayacan, honey locust, pencil cactus and a few scattered prickly pears.

Calliopsis  hondurasica

Size:  6 mm (male) 

Associated plant:

Texas frogfruit

Phyla nodiflora

Family:  Verbenaceae

When seen:  April 13, 2021

McAllen, TX

Male bee

Face of male bee

The bee's scapes are mostly yellow: there is some dark brown on the apical end of the rear surface of each scape.


Male bee

Triepeolus rufoclypeus

Size:  9 mm (male) 

Associated plant:


Wedelia acapulcensis

Family:  Asteraceae

When seen:  April 13, 2021

McAllen, TX 

Male Triepeolus. The yellowish bands on the bee's abdomen continue onto the sternum. (Viewed from the side, the yellow band on T2 lacks that lateral extension that turns at a right or acute angle, seen on many other Triepeolus bees.)

There are five fairly narrow bands of even width on T2-T6. On T1, the apical transverse band is slightly interrupted. The basal and apical hairbands of T1 are not parallel. The dark region in the middle of T1 is wider than the pale hairbands on either side of it.

The black areas of T-3-T6 are as narrow as the yellow bands. The bee’s downturned apical plate has a rounded tip.

The bee has red tegulae and predominantly red legs (with black coxae, black areas on all femora, and black on the hind tronchanters).

The scutum and scutellum are black. There is a pale strip of pale hair on the pronotal collar. Two short strips of pale hair run longitudinally away from the pronotal collar, and are clearly separated from it.

This bee has a black clypeus, partly black and partly dark-red labrum, and dark-red jaws. It clypeus lacks a midline.

The bee's antennae are black except for the pedicels and scapes, which are dark red.

Male bee

Male bee

ID:  Identified as Dianthidium discors

Size:  10 mm (male) 

Associated plant:

(Guaiacum angustifolium)

Plant family:  Zygophyllaceae  

When seen: May 6, 2021

La Puerta Tract
Near  Rio Grande City, Starr Co., TX

Male bee

The apical edge of the scutellum is semi-circular and convex. There are paper-thin, semi-translucent extensions on the bee's pronotal lobes.

The male bee has prominent spines on its hind coxae.