A revision of the subgenus Osmia (Diceratosmia), with descriptions of four new species (Hymenoptera, Megachilidae) Author Rightmyer, Molly G. text Zootaxa 2017 2017-10-17 4337 1 1 37 journal article 31832 10.11646/zootaxa.4337.1.1 d7147fd1-b46c-435d-8b08-f6e46ef6e3c4 1175-5326 1014033 39A92904-0378-4B5D-AE6F-704E5B38A59C Osmia ( Diceratosmia ) conjuncta Cresson ( Figs 2D , 7B , 8C ) Osmia conjuncta Cresson 1864 : 31 –32 [Holotype female: Philadelphia]; Medler & Lussenhop 1968 : 42 –43 [diagnosis of male]. Osmia 4-dentata Cresson 1878 : 107 [Holotype male: Philadelphia]; (preoccupied); Robertson 1893 : 276 [synonymy]. Osmia cressonii Dalla Torre 1896 : 392 [replacement name for quadridentata Cresson , nec quadridentata Fonscolombe 1879 , which is a junior synonym of Hoplitis ( Anthocopa ) jakovlevi (Radoskowski) , Zanden 1996 : 885 ] Osmia quadridentata Cresson ; Dalla Torre 1896 : 392 [Emend.]; Cockerell 1912 : 223 [synonymy]. Diceratosmia quadridentata (Cresson) ; Robertson 1903 : 171 . Diceratosmia conjuncta (Cresson) ; Sandhouse 1939 : 139 . Osmia ( Diceratosmia ) conjuncta Cresson ; Sinha 1958 : 230 . Diagnosis. Females of O . conjuncta can be distinguished from all other small (i.e., intertegular distance 1.5–2.5 mm ), blue Diceratosmia except O . marilaunidii by the combination of lack of modified facial and scopal hairs, shiny clypeus and frons, and the smoothly rounded mesepisternum between the anterior and lateral surfaces. Females of O . conjuncta can be distinguished from O . marilaunidii by the relatively straight carina between the second and fourth mandibular teeth in O . conjuncta (forming at most one-fourth of a circle) versus more strongly semicircular in O . marilaunidii (forming ca. one-half of a circle), as well as by the sculpturing of the anterior surface of T1 (dull in O . conjuncta , polished in O . marilaunidii ). Males of O . conjuncta can be distinguished from all other blue/green Diceratosmia except O . marilaunidii by the strongly concave apical margin of S3; the acutely pointed lateral projections of T6; and the long, slender medioapical hairs on S4 that are well separated from the hairs on the far lateral sides of S4. Osmia conjuncta and O . marilaunidii can be separated by the dull anterior surface of the scape and anterior surface of T 1 in O . conjuncta (shiny in O . marilaunidii ), the relatively densely punctate metepisternum (sparsely punctate in O . marilaunidii ) and the lack or reduction of impunctate lateral areas subapically on S4 (large lateral impunctate areas occur in O . marilaunidii ). Distribution. Eastern United States and adjacent Canada as far west as Kansas ( Fig. 15 ). Material Examined. Canada . Ontario : Bancroft , 18 May 1961 G Knerer ; Cambridge, 12km E, Beverly Swamp, 20 Jun 2001 ; Cookesville , 3 Jun 1960 ; Eagle , 22 May 1965 ; Edsall , 20 May 1917 ; Forks of Credit , 26 Jun 1969 , P. MacKay ; Hilton Falls , 15 Apr 2000 , T Romankova ; London, 7 May 1981 , DG Krementz ; Maple, 26 Apr 1962 , G Knerer ; Palgrave, 8 Jun 2002 , T Romankova ; Palgrave, Duffy’s Line, 18 Mar 2006 ; Point Pelee , 10 May 1961 , G Knerer ; Terra Cotta , 27 May 2000 , T Romankova ; Toronto , 24 Apr 1946 , CEA Atwood . Quebec : Rouville Co , 25 May 1906 , [no collector]. USA . Connecticut : Fairfield Co, Stamford, 14 Apr 1930 . District of Columbia : Washington , 1935, JC Bridwell . Florida : Miami-Dade Co, Key Biscayne, 15 Feb 1925 , S Grenicher ; Sanford Co, Seminole, 12 Mar 1927 , FM Uhler . Georgia : Clarke Co, Athens, Whitehall Preserve, 9 Apr 1979 , RH Turnbow Jr . Kentucky : Barren Co, Cave City, 22 Jun 1996 , L Strange . Maryland : Anne Arundel Co , Laurel , Patuxent Wildlife Refuge , 8 May 2001 Russell, Droege; Anne Arundel Co, Laurel, Patuxent Wildlife Refuge, 10 May 2001 Russell, Droege; Anne Arundel Co, Laurel, Patuxent Wildlife Refuge, 5 Jun 2001 Russell, Droege; Montgomery Co, Cabin John, 18 May 1915 , JC Crawford ; Montgomery Co, Chevy Chase, 19 Apr 1919 , HL Viereck ; Montgomery Co, Chevy Chase, 10 May 1919 ; Montgomery Co, Chevy Chase, 15 May 1919 . Michigan : Presque Isle Co , Ocqueoc Lake , 20 Jun 1978 , RW Hodges. Mississippi : Oktibbeha Co , 4 May 1991 , RL Brown ; Oktibbeha Co, Osborn, 1 Apr 2000 , B Smith ; Oktibbeha Co, Osborn, 19 Apr 2000 , B Smith ; Oktibbeha Co, Osborn, 29 Apr 2000 , B Smith ; Oktibbeha Co, Sessums, 8 Apr 2000 , B Smith , JA MacGown ; Oktibbeha Co, Sessums, 19 Mar 2000 , B Smith, JA MacGown. New York : Seneca Co , Cayuga Lake , 8 May 1935 , HK Townes ; Seneca Co, Waterloo, 6 mi NW, 18 May 1986 , B Alexander ; Tompkins Co, Ithaca, 27 Apr 1936 , HK Townes ; Tompkins Co, Ithaca, 6 May 1936 , HK Townes ; Tompkins Co, Ithaca, 2 May 1936 , EJ Berberg ; Tompkins Co, Van Natta’s Dam , Ithaca, 1 May 1936 . Oklahoma : Latimer Co , [no location], Apr 1989 , K Stephan . Pennsylvania : Northampton Co , Wind Gap , 9 Jul 1954 , JW Green ; Westmoreland Co, Powdermill Nature Reserve, near Rector, 24 Apr 1965 , CJ McCoy ; Westmoreland Co, Powdermill Nature Reserve, near Rector, 6 May 1965 , CJ McCoy . Tennessee : Anderson Co, Oak Ridge, 19 Apr 1965 , DJ Burdick ; Anderson Co, Oak Ridge, AEC area, 5 Jun 1964 . Texas : Brazoria Co , West Columbia , 5 Mar 1936 ; Matagorda Co, Bay City, 6 May 1953 , LD Beamer ; Milam Co, Cameron, 9 Apr 1953 , LD Beamer. Virginia : Fairfax Co , Great Falls , 19 May 1915 , LO Jackson. Wisconsin : Milwaukee Co, Milwaukee, 20 May 1903 , S Graenicher. Floral Associations. Asteraceae : Senecio anonymus , Taraxacum ; Brassicaceae : Brassica ; Fabaceae : Lupinus perennis , Trifolium repens ; Rosaceae : Fragaria , Rosa , Rubus flagellaris ; Rubiaceae : Hedyotis nigricans ; Salicaceae : Salix . Comments. Osmia conjuncta has been documented as nesting in snail shells ( Rau 1937 ) and is likely polyletic ( Hurd 1979 ).