BIML Updates - Lasioglossum, Colletes, Bees per Bowl Trap, State Records, Mystery Map
USGS Bee Inventory and Monitory Lab Updates
Interesting Record - Lasioglossum michiganense - DC
This very rare parasitic species that was taken in a bowl trap from the grounds of the National Park Service Center for Urban Ecology in NW Washington D.C. No real habitat other than houses and the manicured McMillan Reservoir nearby. There are now several records for this species in the DC area, whereas Mitchell lists only one....can you guess where it was found?
Colletes, male, identification, various
The following updates to the male guide have been added to clarify some male ID problems:
C. thoracicus vs C. distinctus
C. thoracicus - Larger, on average 10-13mm long - Mesepisturnum, regions between and within the pits DULLED by microscopic lines and tiny pits
C. distinctus - Smaller, on average 8-10mm - Mesepisturnum, particularly towards the bottom clearly REFLECTING light in regions between pits, microscopic lines, if present, are of low density
C. thoracicus vs C. banksi, C. brimleyi, C. hyalinus
C. thoracicus - Larger, on average 10-13mm long - Malar space clearly longer than half the width of the base of the mandible - Labrum noticably, gently, and evenly convex throughout the entire central portion
C. banksi, C. brimleyi, C. hyalinus - Smaller, on average 8-10mm - Malar space about half to clearly less than half the width of the base of the mandible - Labrum at least in C. brimleyi, which was the only specimen available at the time of this writing, flat
Does anyone have male specimens of C. banksi or C. hyalinus and could check that the labrum is relatively flat?
Bees Per Bowl
Cheryl Fimbel reports that her bowls surveys from 9 sites in lowland Puget prairies in Washington state yielded 4250 specimens across 1188 trap days for a rate of 3.57 bees per bowl.
New State Records
Lasioglossum atlanticum (KY) - Found regularly in south central Kentucky...mostly this represents recent work by Jason Gibbs on clarifying what this species looks like....in the past I would have recorded it as L. admirandum.
Holcopasites calliopsidis (KY) - Also found in the same locale in Kentucky...this demonstrates how little collecting has been done in the state, this is a nest parasite of the very common Calliopsis andreniformis.
Lasioglossum cephalotes (WV) - Two specimens found in a summer camp along the Cacapon River...another uncommon nest parasite.
Hint: Occupies marshes and cities, but not too far north
A closer look at the Chesapeake Region
Answer: Ptilothrix bombiformis
A mallow specialist that doesn't mind using upland planted mallows in addition to those in brackish and fresh marshes.
Sam Droege sdroege@...
w 301-497-5840 h 301-390-7759 fax 301-497-5624
USGS Patuxent Wildlife Research Center
BARC-EAST, BLDG 308, RM 124 10300 Balt. Ave., Beltsville, MD 20705
In my sleep I was fain of their fellowship, fain
Of the live-oak, the marsh, and the main.
The little green leaves would not let me alone in my sleep;
Up-breathed from the marshes, a message of range and of sweep,
Interwoven with waftures of wild sea-liberties, drifting,
Came through the lapped leaves sifting, sifting,
Came to the gates of sleep.
- Sidney Lanier
P Bees are not optional.