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10Proposed Changes in Eastern Nomada Taxonomy

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  • Sam Droege
    Apr 20, 2006
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      I have been struggling with Eastern Nomada for the past year and half; trying to resolve the many incomplete sections of Mitchell's keys, associating males and females, and working out  better identification features.  The keys located at:

      Female Nomada

      Male Nomada

      Are very functional right now, but there is still a great deal of work  to do on some of the difficult groups such as those with bidentate mandibles, those whose females primarily have white setae on the rear of the tibia, and the red-haired females.  

      Below  is a summary of the changes and observations for all but the bidentate group.  I will send out another set of emails about the bidentate species today or tomorrow.

      Note that there are also some significant problems with Robertson's types in that in some cases they do not match the species workers commonly ascribe to their names....Those problems are not listed here either.

      Affabilis – Regular/Common; Spring;
      Annulata – Uncommon; Spring
      Aquilarum – Rare; the only specimen I have seen was a male from NM, need to see some eastern specimens
      Armatella – Rare; Spring; female previously undescribed
      Articulata – Common; Spring/Early Summer;
      Augustiana – Rare; Spring; the male was undescribed but was determined to be the same species as indusata which had no associated female, the name augustiana has precedence
      Australis – Common; Spring; Abdomen without any markings
      Autumnalis – Rare;  Fall
      Azaleae – This was determined to be the male of depressa. Need to compare male depressa specimens at home with type
      Banksi – Regular; Late Summer/Fall; Background of abdomen very dark
      Bethunei – Regular/Uncommon; Spring, the female was undescribed but was determined to be the same species as  pseudops which had no associated male, the name bethunei has precedence
      Capillata – Haven’t seen any specimens
      Ceanothi -  Regular; Spring; still investigating this species, could be pygmaea;
      Composita – Regular; Early Spring; the male was previously undescribed, I have males that are either this species or integra, integra and composita may be the same species
      Cressonii – Regular; Spring;
      Crudelis – Rare; need to revisit the type in Philadelphi
      Dentariae – Rare/Uncommon; Spring; need to see more specimens of this species to be sure about its place
      Decepta – This was determined to be obliterata; the type is heavily cyanided
      Denticulata – Common; Spring;
      Depressa – Regular; Spring; the male was undescribed but was determined to be the same species as azaleae which had no associated female, the name depressa has precedence
      Detrita – No specimens have been seen
      Dreisbachi – Need to see the type, this may be the same as cressonii
      Electa – Uncommon; Fall;
      Electella – Rare;
      Erigeronis – Uncommon;  
      Fervida – Regular; Spring;
      Festiva – Rare/Uncommon; want to look at type again
      Florilega – Uncommon;
      Fragariae – Uncommon; female previously undescribed
      Gracilis – Rare; Fall; need to see the type
      Graenicheri – Rare; some specimens in collections are labeled besseyi, but I believe this to be an unpublished synonym of graenicheri; Late summer/Fall;
      Heiligbrodti – based on notes from John Ascher I have lumped this species with texana, however, this may not be warranted as there are some noticable differences between northern and southern populations – see notes in the guide
      Illinoensis – need to see the types, but so far have seen nothing that safely separates this species from sayi
      Imbricata – Common; Spring;
      Indusata – has been determined to be the male of  augustiana, the name augustiana has precedence
      Inepta – Uncommon; Spring; the undescribed male may have been found but these could also be composita, these 2 species may also be the same
      Integerrima – Spring;
      Kingstonensis – The type was examined and was found to be a faded specimen of lehighensis, likely from cyanide
      Lehighensis – Uncommon; Spring/Early Summer; male previously undescribed
      Luteola – Uncommon; Spring;
      Luteoloides – Common; Spring;
      Media – Found to be the same as Depressa – holotype has yellow on rear face of propodeum otherwise it is the same
      Mendica – Male holotype seen at the MCZ in April of 2006.  This species has all of the characteristics of a male xanthura, including tibial setae, partially interrupted yellow stripes on T2-5, general color, size, and appearance.  Mitchell noted a truncate pygidium and it actually has a very shallow notch to it, but this could simply be normal variation.
      Micheneri – Rare; Spring;
      Miniata – type in British museum no other specimens known, Mitchell apparently saw the specimen but didn’t take detailed notes.  However, these is a note that the mandibles were unusually long which may mean it could be one of the red-haired species like inepta, the descriptions roughly parallel each other.
      Minima – Male holotype seen at the MCZ in April of 2006.  This species has all the characteristics of a small male illinoense.  I have a series of specimens that matches.  Antenna and coloration do not match parva.
      Modesta – Uncommon; Late Summer;
      Obliterata – Uncommon/Regular; Spring;
      Orba – need to revisit the type, likely will be lumped with one of the other white setae species
      Parva – Regular; Spring;
      Placida – Regular; Late Summer/Fall;
      Proxima – need to look at the type again
      Pseudops – found to be the female of bethunei, the name bethunei has precedence
      Pygmaea – Common; Spring;
      Rodecki – Rare; Spring;
      Rubicunda – Uncommon; Late Spring to Late Summer
      Salicis – No specimens have been seen
      Sayi – Regular; Spring; see illinoense notes
      Seneciophila – Uncommon/Regular; Spring;
      Skinneri – No specimens have been seen
      Sobrina – type needs to be looked at again
      Sphaerogaster – Rare; Spring;
      Subrutilla – found to be the same as luteoloides
      Sulphurata – Uncommon; Spring;
      Superba – Rare; Spring;
      Texana – Uncommon; Late Summer/Fall; needs to be revisited as specimens from TX and the deep south may differ from northern populations and with specimens called heiligobrodti
      Tyrrellensis – Found to be the same as pygmaea
      Ulsterensis – need to look at type again, my notes indicate that it is possible to be the male of composita
      Valida – Spring/Early Summer; no legitimate specimens have been seen from the East, need to see the type, see notes in guide
      Vicina – Uncommon; Late Summer/Fall;
      Vincta – Uncommon; Fall;
      Wisconsinensis – found to be the same species as fervida
      Xanthura  - male was previously undescribed


      Sam Droege  Sam_Droege@...                      
      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 mosquito was heard to complain
      That the Chemist had poisoned his brain
      The cause of his sorrow
      Was paradichloro-