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Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa.
Lasioglossum (Dialictus) floridanum (Robertson)
Halictus floridanus Robertson, 1892: 269. ♀.
Lectotype. ♀ USA, Florida, Inverness, 7.iii.1891 (C. Robertson); [INHS: 10232] by W. E. LaBerge (in Webb 1980).
Examined.
Dialictus intrepidus Mitchell, 1960: 437. ♂.
Holotype. ♂. USA, Georgia, Stone Mountain, 7.vi.1917; [CUIC: 4891]. Examined.
Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) floridanum floridanum, p. 1113 (catalogue); Mitchell, 1960:
Dialictus pilosus floridanus, p. 414 (key, tax. char.); Krombein, 1967: Lasioglossum (Dialictus) pilosum floridanum, p.
465 (catalogue); Moure and Hurd, 1987: Dialictus pilosus floridanus, p. 123 (catalogue); Gibbs, 2010b: Lasioglossum
(Dialictus) floridanum, p. 258 (tax. notes, synonymy).
Diagnosis. Female L. floridanum can be recognised by the following diagnostic combination: head elongate (length/
width ratio = 1.08–1.10) (Fig. 103B); clypeus with apicolateral margins subparallel (Fig. 103B); mesoscutal punctures
dense (i
Male L. floridanum can be recognised by the head elongate (length/width ratio = 1.17) (Fig. 105B); eyes strongly
convergent below (UOD/LOD ratio = 1.54); clypeus with distal margin brown, sometimes yellow; mesoscutal punctures
dense (Fig. 106); metapostnotal rugae weak; and metasomal terga metallic, punctation dense and distinct. They are most
similar to L. pilosum and L. succinipenne, both of which have clypeus with yellow distal band and metapostnotal rugae.
Redescription. FEMALE. Length 4.70–6.66 mm; head length 1.73–1.92 mm; head width 1.60–1.75 mm; forewing
length 3.93–4.36 mm.
Colouration. Head and mesosoma pale green to golden green. Clypeus with apical half blackish brown. Supraclypeal
area bronze. Antenna dark brown, flagellum with ventral surface reddish brown at apex. Tegula amber. Wing venation
and pterostigma pale amber. Legs brown, except protibial base and medio- and distitarsi reddish brown. Metasomal terga
golden green, sterna brown, apical margins pale, translucent yellow.
Pubescence. Dull white to yellowish. Dense. Head and mesosoma with moderately dense woolly hairs (1–1.5 OD),
longest on genal beard, metanotum, and mesopleuron (2–2.5 OD). Paraocular area and gena with subappressed tomentum
sometimes partially obscuring surface. Mesoscutum with dense hairs. Propodeum with moderately dense plumose
hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with dense, fine hairs. T1 acarinarial fan complete
and dense. T1 apicolateral portion with tomentum. T2 basal and lateral portions, T3 basal, lateral and apicolateral portions,
T4–T5 with dense tomentum obscuring surface. T2–T4 apical margins with moderately dense fringes.
Surface sculpture. Face imbricate, punctation fine. Clypeus polished, imbricate, punctation (i=1–2d). Supraclypeal
area with punctation moderately dense (i=1–1.5d). Lower paraocular and antennocular areas with punctation dense (i≤d). Upper paraocular area and frons punctate-reticulate. Ocellocular area minutely punctate-reticulate. Gena and postgena
lineolate. Mesoscutum tessellate-imbricate, punctation dense on medial portion of disc (i
Structure. Head elongate (length/width ratio = 1.08–1.10). Eyes convergent below (UOD/LOD ratio = 1.20–1.26).
Clypeus ˝ below suborbital tangent, apicolateral margins weakly convergent. Antennal sockets close (IAD/OAD < 0.5).
Frontal line carinate, ending 2OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with 4
branches. Metapostnotum truncate (MMR ratio = 1.28–1.38), posterior margin weakly angled onto posterior surface.
Propodeum with oblique carina fine, lateral carina weak, not reaching dorsal margin.
MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 5.51 mm; head
length 1.78 mm; head width 1.51 mm; forewing length 4.05 mm.
Colouration. Labrum brownish yellow. Mandible brownish yellow. Clypeus distal margin yellowish brown (rarely
brown). Flagellum with ventral surface ferruginous. Legs brown, except tibial bases and apices and tarsi brownish yellow.
Pubescence. Moderately dense. Face below eye emargination with tomentum obscuring paraocular area, partially
obscuring clypeus and supraclypeal area. T1 acarinarial area with sparse fan of appressed hairs. T2–T3 basolaterally and
T4 basally with sparse tomentum. S2–S3 entirely and S4 laterally with posteriorly directed hair patches (1–1.5 OD).
Surface sculpture. Clypeal punctation moderately dense (i=1–2d). Propodeum with dorsolateral slope and lateral and
posterior surfaces rugulose. Metasomal terga punctation deep, distinct.
Structure. Head very elongate (length/width ratio = 1.17). Eyes strongly convergent below (UOD/LOD ratio = 1.54).
Clypeus 2/3 below suborbital tangent, apicolateral margins subparallel. Antennal sockets distant (IAD/OAD = 1.0). Frontal
line carinate, ending 2OD below median ocellus. Pedicel shorter than F1. F2 length 1.5X F1. F2–F10 moderately elongate
(length/width ratio = 1.33–1.50). Metapostnotum truncate (MMR ratio = 1.45), posterior margin weakly angled onto
posterior surface.
Terminalia. S7 with median lobe clavate, apex rounded (Fig. 107). S8 with apicomedial margin weakly convex (Fig.
107). Genital capsule as in Fig. 107. Gonobase with ventral arms narrowly separated. Volsella roughly ovoid. Gonostylus
small, dorsal setae elongate. Retrorse lobe elongate, strongly attenuated apically.
Range. Wisconsin south to Florida, west to Texas (Fig. 102). USA: FL, GA, IN, MD, NC, OK, SC, TX, WI.
Additional specimens examined. USA: FLORIDA: 1♀ Union Co., 3.i.1930 (R.B. Howard); [CUIC]; 15♀♀ paratypes,
Inverness, (C. Robertson); [INHS]; 1♀ Inverness, (C. Robertson); [UCMC]; GEORGIA: 3♀♀ 1♂ Pavo, N30.941
W083.708, 2.vi.2005 (A. Zayed); [PCYU]; INDIANA: 1♀ Porter Co., Indiana Dunes N.L., Ogden Dunes, N41°37′0′′
W87°11′51′′, 22.vi.2004 (R. Grundel); 1♀ Porter Co., Indiana Dunes N.L., Ogden Dunes, N41°37′0′′ W87°11′51′′,
23.vii.2003 (R. Grundel); 2♀♀ Jasper Co., Tefft Savanna, N41°9′25′′ W86°58′41′′, 28.iv.2004 (R. Grundel); 2♀♀ Jasper
Co., Tefft Savanna, N41°9′25′′ W86°58′41′′, 14.vii.2003 (R. Grundel); [IDNL]; 1♀ Jasper Co., Nipsco, 17.vii.2001 (R.P.
Jean); 1♀ Newton Co., Conrad, 4.vi.2003 (R.P. Jean); 1♀ Starke Co., Ober, 29.vi.2001 (R.P. Jean); [PCYU]; MARYLAND:
1♀ Worcester Co., Pocomoke River S.F., sand dune, N38.23882 W075.58212, 18–20.ix.2009 (J. & F. Frye);
[CUIC]; NORTH CAROLINA: 18♀♀ Hoke Co., Fort Bragg Mil. Res., 10–13.vi.1998 (B.N. Danforth); [CUIC]; 1♀1♂
Spout Spring, 25.x.1952 (T.B. Mitchell); [CUIC]; 3♀♀ S. of Lillington, 29.iii.1945; [NCSU]; SOUTH CAROLINA: 1♀
Aiken, 13.vi.1957 (J.R. Vockeroth); 1♀ Hilton Head Is., 11–23.vii.1965 (H.F. Howden); [CNC]; 1♀ Chesterfield Co.,
N34.5836 W080.24529, 18.v.2006 (S.W. Droege); 3♀♀ Chesterfield Co., N34.5305 W080.2223, 6–8.ix.2006 (S.W.
Droege); [PCYU]; TEXAS: 1♀1♂ Bastrop Co., Bastrop S.P., 3.viii.1988 (J.L. Neff); [CTMI]; 1♀ Donley Co., Lake
McClellan, 28.vii.1972 (G.C. Eickwort); 1♀ Nacogdoches Co., N31.5011 W094.7839, 16–30.vi.2010 (C. Adams);
[CUIC]; WISCONSIN: 1♀ Monroe Co., N44.1465 W090.6948, 15–19.vii.2010 (H. Gaines).
Floral records. ASTERACEAE: Chrysopsis, Cirsium, Coreopsis palmata, “Haplopappus”, Pyrrhopappus, Silphium;
ERICACEAE: Vaccinium; EUPHORBIACEAE: Euphorbia corollata; FABACEAE: Amorpha, Baptisia, Galactia;
ROSACEAE: Photinia, Crataegus, Rubus; SCROPHULARIAE: Aureolaria pedicularia; UNCERTAIN:
“Gerardia”.
DNA Barcode. Available. Multiple sequences.
Comments. Uncommon.
Mitchell (1960) and others have considered L. floridanum to be a subspecies of L. pilosum. The degree of
morphological differentiation between L. floridanum and L. pilosum is similar to that between other species of L.
(Dialictus) and DNA barcodes distinguish the two species. As such, full species-level status has been given to L.
floridanum (see Gibbs 2010b).
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