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BIML update - Melitoma, Andrena, Lasioglossum, Hylaeus, Megachile

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  • Sam Droege
    USGS BIML UPDATES 2/10/2010 New State Records Lasioglossum simplex - South Dakota Badlands. This extends this species range well to the West. Melitoma Guide
    Message 1 of 1 , Feb 10, 2011

      USGS BIML UPDATES  2/10/2010

      New State Records

      Lasioglossum simplex - South Dakota Badlands.  This extends this species' range well to the West.

      Melitoma Guide for North America

      Michael Orr (with lots of consultations with Jack Neff - Thanks Jack) has created a guide to the Melitoma of the U.S. and Canada

      The following guide updates were done by Michael Orr

      Male Andrena Guide

      A. crataegi vs A. fenningeri

      A. crataegi - The labral process is straight to slightly emarginate with the emargination creating broadly rounded outer edges such that these outer lobes are equal to one-third or more of the latitudinal width of the labral process  - Pits on the scutum are readily visible due to the combined relatively low tessellation and the deepness of the pits, with pit density uniformly one pit diameter or less - Pit density in the apically impressed rim of T2 about equal to that of the basal area - There are long, off-white hairs present basal to the reflexed rim of S6, appearing to reach over the reflexed rim and very weakly cover it due to the density of the hairs being only slightly higher here than elsewhere on S6

      A. fenningeri - The labral process is bidentate, forming narrowly rounded lateral edges or tips equal to less than one-fourth the latitudinal width of the labral process, forming a strong, inverted U-shaped concavity in the center of the labral process - Pits on scutum are difficult to see due to heavy tessellation and dulling of the surface and these pits relative shallowness, when these pits are evident they display variable interpit distances averaging approximately one pit diameter - Abdomen, T2, pit density in the apically impressed rim area DISTINCTLY LOWER than in the basal area - In contrast to A. crataegi, the hairs on the apical rim of S6 are shorter and off-white to yellow, denser than elsewhere on S6, and arising from on the reflexed apical rim itself

      A. macra vs A. perplexa

      A. macra - Mandibles long such that, with the mandibles closed, tips of mandibles exceed clypeus midline by one-third to one-fourth of their total length, forming a weak X which most often must be confirmed with a ventral view - F1 nearly as long as F2+F3 - The apically impressed area of T2 is of equal pit density to the basal area of the segment

      A. perplexa - Mandibles extremely long such that, with the mandibles closed, tips of mandibles exceed the clypeus midline by two-fifths to one-half of their total length, forming a very strong X which may often be visible from an anterior view - F1 about as long as F2, much shorter than F2+F3 - The apically impressed area of T2 is of far lesser pit density in comparison to the basal area of the segment

      Megachile Female Guide

      M. exilis vs M. rugifrons

      M. exilis - Mandibles relatively short and stout, with the teeth more evenly spaced - T6 with only dark hairs basally -  In direct comparison, much smaller than M. rugifrons, ranging from 9-10mm

      M. rugifrons - Mandibles extremely long and slender, with one basal tooth at the inside corner of the mandible and the remaining three teeth located at the tip of the mandible, more than three-fourths down the length of the mandible - Hairs on the base of T6 primarily white with some dark hairs intermixed, making the basal hair density of M. rugifrons higher in comparison to that of M. exilis - In direct comparison, much larger than M. exilis, ranging from 13-15mm

      The following has been updated in the Female Hylaeus Guide

      H. annulatus, H. mesillae, H. rudbeckiae, H. saniculae - Some difficult to impossible to differentiate!
      H. annulatus - Uncommon to locally regular - Yellow on the front tibia ABSENT OR RESTRICTED to a small dot at the base of the tibia - Averages slightly LARGER than all of the other species, in comparison, measurement of a few specimens indicated head width of 1.6 mm and lengths of 1.5 mm

      H. mesillae - Common - Yellow or orange on the front tibia extensive, occupying HALF TO TWO THIRDS of the front face - Tubercles yellow, center of the clypeus near the rim sometimes with a smudge of yellow - Tegula sometimes with and sometimes without a small yellow mark -  Very slightly smaller than H. rudbeckiae - Head width less than 1.4mm and face length 1.2mm or LESS, length measured from the front of the middle ocelli to the rim of the clypeus - Tending to have more subdued and less extensive markings than H. rudbeckiae

      H. rudbeckiae - Very Rare - Slightly larger than H mesillae - Head width 1.40mm or more, rarely less, usually about 1.5mm and face length 1.2mm or MORE, length measured from front of middle ocelli to end of clypeus - Tending to have brighter and more extensive markings, especially on the clypeus, its entire apical third often being smudged with yellowish - orangish color - A VERY RARE species

      H. saniculae - Rare - Yellow on the front tibia absent or restricted to a small dot at the base of the tibia - NO YELLOW on the tubercles - Facial markings reduced to narrow lines in the paraocular region and these lines not extending beyond the base of the antennae, and, like the much larger H. annulatus and unlike H. mesillae this mark does not fill the region between the clypeus and the compound eye - Smallest of all these species

      Lasioglossum Guide Update

      The Lasioglossum Guide is actively being updated with new and manuscript names ...changing characters and scoring new species, usable, but with caution as many species will not now resolve with the new ones being added.


      P.S. Some guides are now being expanded to include European species, more on that to come....

      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

      The Minimal

      I study the lives on a leaf: the little
      Sleepers, numb nudgers in cold dimensions,
      Beetles in caves, newts, stone-deaf fishes,
      Lice tethered to long limp subterranean weeds,
      Squirmers in bogs,
      And bacterial creepers
      Wriggling through wounds
      Like elvers in ponds,
      Their wan mouths kissing the warm sutures,
      Cleaning and caressing,
      Creeping and healing.

         - Theodore Roethke

      P Bees are not optional.
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