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Identification Summary: Small to moderate sized; blue with pale tegulae; scutum with dense punctures throughout.
Reprinted with permission from: Mitchell, T.B. 1960 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.
FEMALE—Length 45 mm.; head and thorax dark olive green, abdomen greenish basally, more piceous apically, rim of basal segment narrowly testaceous and that of segment 3 broadly testaceous; pubescence short, thin, entirely whitish, somewhat more dense on apex of abdomen; head slightly broader than long; clypeus rather broadly convex, projecting about one-half below suborbital line; supraclypeal area slightly broader than long, considerably shorter than clypeus; eyes slightly convergent below; lateral ocelli slightly nearer eyes than to each other; labrum and mandibles reddened; cheeks subequal to eyes in width; face below ocelli dull, punctures extremely fine and close, but quite deep and distinct, becoming slightly more separated on vertex laterally; upper cheeks somewhat shining but very closely and minutely punctate beneath the rather dense pubescence, becoming more bare and more distinctly striate and rather dull below; hypostomal carinae parallel, apical angles acute; lower half of face somewhat more shining, punctures somewhat coarser and more widely separated but not sparse, those on supraclypeal area and upper portion of clypeus quite sparse, rather deep and distinct, becoming rather coarse and more widely separated on clypeus apically, this area somewhat reddened; scutum and scutellum dull, very finely and closely punctate throughout, punctures almost crowded at extreme sides (finer, but about as close as in tegularis, fig. 99); rather closely and somewhat obscurely punctate, punctures coarser above, finer below; dorsal area of propodeum irregularly rugoso-striate medially, striae incomplete, but becoming more regularly and completely striate laterally, lateral faces somewhat shining and finely roughened; wings subhyaline, veins and stigma brownish-testaceous; tegulae pale reddish-testaceous; basal portions of legs brownish, becoming somewhat more testaceous apically; abdominal terga somewhat shining, punctures minute and quite close throughout, apical margins slightly and rather broadly impressed medially, impressed areas more or less testaceous, terga 3 and 4 to some degree covered with rather dense, pale tomentum.
TYPE S—Holotype: Female, Jacksonville Beach, Fla., Aug. 5, 1946 (Mitchell). Paratypes: FLORIDA: 5 females, topotypical; 1 female, topotypical, Aug. 20, 1937 (Mitchell); 1female, Marion Co., 10 mi. S. W. Ocala, “The Big Scrub,” Sept. 3, 1938 (Hubbell—Friauf); 1 female, Key West Dec. 27, 1953 (H. V. Weems, Jr., on Flaveria linearis).
Paratypes are in collections of T. H. Hubbell, the Florida Plant Board, and the author.
Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa.
Lasioglossum (Dialictus) miniatulum (Mitchell)
Dialictus miniatulus Mitchell, 1960: 405. ♀.
Holotype. ♀ USA, Florida, Jacksonville Beach, 5.viii.1946 [NCSU]. Examined.
Taxonomy. Krombein, 1967: Lasioglossum (Dialictus) miniatulum, p. 464 (catalogue); Hurd, 1979: Dialictus miniatulus,
p. 1968 (catalogue); Moure and Hurd, 1987: Dialictus miniatulus, p. 113 (catalogue)
Diagnosis. Female L. miniatulum can be recognised by the following diagnostic combination: head and mesosoma
bluish; head wide to round (length/width ratio = 0.96–0.99 ); postgena lineolate; mesoscutal punctures dense throughout
(i
Male L. miniatulum can be recognised by the following diagnostic combination: head round (length/width ratio
= 1.00) (Fig. 162B); pronotal ridge broadly rounded; parapsidal line narrow (Fig. 163); mesepisternum with punctation
distinct, dense; tegula ovoid; tarsi brownish yellow; metasomal terga brown, except posterior margins reddish;
T2–T3 without tomentum; T2 apical impressed area distinctly punctate; and sternal pubescence short (1OD). They
are most similar to L. arantium which have sparse basolateral tomentum on T2–T3 and have pale green mesoscutal
integument.
Redescription. FEMALE. Length 4.41–5.02 mm; head length 1.32 mm; head width 1.37 mm; forewing length
3.09–3.33 mm.
Colouration. Head and mesosoma pale blue. Labrum and mandible reddish brown to yellow. Clypeus with apical
half blackish brown. Antenna dark brown, flagellum with ventral surface brown to reddish brown. Tegula pale yellow.
Wing membrane subhyaline, venation and pterostigma yellowish brown. Legs brown, except tibial bases and apices,
medio- and distitarsi, and sometimes protibia and basitarsi reddish to brownish yellow. Metasoma terga blackish brown,
T1–T2 with some reddish tints anteriorly, terga and sterna with apical margins translucent yellow.
Pubescence. Dull white. Moderately dense. Head and mesosoma with moderately dense woolly hairs (1–1.5 OD),
longest on genal beard, metanotum, and mesopleuron (2–2.5 OD). Lower paraocular area and gena with subappressed
tomentum, not obscuring surface. Mesoscutum lateral margins and mesepisternum dorsally with tomentum. Metepisternum
obscured by tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5
OD). Metasomal terga with moderately dense, fine hairs. T1 acarinarial fan complete (obscure on pale background). T1
apicolaterally, T2–T3 basally and laterally, and T4 throughout with moderately dense tomentum partially obscuring surface.
T2 apicolateral and T3–T4 apical margins with relatively dense fringes.
Surface sculpture. Face imbricate, punctation moderately strong. Clypeus with apical half polished, punctation moderately
sparse (i=1–1.5d). Supraclypeal area with punctation moderately sparse (i=1–1.5d). Lower paraocular area and
antennocular area punctation dense (i≤d). Upper paraocular area, frons and ocellocular area punctate-reticulate. Gena and
postgena lineolate. Mesoscutum weakly imbricate, polished submedially, punctation dense between parapsidal lines
(i≤d), contiguous laterad of parapsidal line and punctate-reticulate on anterolateral portion. Mesoscutellum polished, submedial
punctation sparse (i=1–2d). Axilla punctate. Metanotum imbricate. Preëpisternum rugulose. Hypoepimeral area
imbricate-punctate. Mesepisternum rugulose-punctate (i≤d), smoother below. Metepisternum with dorsal half rugosocarinulate,
ventral half imbricate. Metapostnotum with anastomosing rugae nearly reaching posterior margin. Propodeum
with dorsolateral slope and lateral surface rugulose-imbricate, posterior surface tessellate. Metasomal terga polished,
punctation distinct throughout, close on basal halves (i=1–1.5d), more widely spaced on marginal zone (i=1–2d).
Structure. Head wide (length/width ratio = 0.96–0.99). Eyes convergent below (UOD/LOD ratio = 1.25–1.27).
Clypeus 1/2 below suborbital tangent, apicolateral margins strongly convergent. Antennal sockets close (IAD/OAD <
0.5). Frontal line carinate, ending 2–2.5 OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate
with 3–4 branches. Metapostnotum moderately elongate (MMR ratio = 1.19–1.35), posterior margin rounded onto
posterior surface. Propodeum with oblique carina obscure, lateral carina weak, not reaching dorsal margin.
MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 3.90 mm; head
length 1.13 mm; head width 1.13 mm; forewing length 2.81 mm.
Colouration. Mandible yellow on apical half. Flagellum with ventral surface reddish brown. Pterostigma yellowish
brown. Legs brown, except bases and apices of tibiae, and tarsi brownish yellow. Metasomal terga brown, apical
impressed areas reddish brown.
Pubescence. Face below eye emargination with scattered tomentum partially obscuring surface, dense on lower
paraocular area.
Surface sculpture. Mesoscutal punctation between parapsidal line relatively sparse (i=1–1.5d). Mesepisternum distinctly
punctate
Structure. Head wide (length/width ratio = 1.00). Eyes strongly convergent below (UOD/LOD ratio = 1.71). Clypeus
1/2 below suborbital tangent, apicolateral margins weakly convergent. Antennal sockets distant (IAD/OAD > 1.4). Frontal
line carinate, ending 1.5 OD below median ocellus. Pedicel shorter than F1. F2 length 1.6X F1. F2–F10 moderately
elongate (length/width ratio = 1.44–1.67). Metapostnotum elongate (MMR ratio = 1.22), posterior margin rounded onto
posterior propodeal surface.
Terminalia. Not examined.
Range. Coastal areas of Florida (Fig. 159).
Additional material examined. USA: FLORIDA: 2♀♀ paratypes Jacksonville Beach, 5.viii.1936 (T.B. Mitchell);
1♀ paratype Jacksonville Beach, 20.viii.1937 (T.B. Mitchell); [CUIC]; 1♀ paratype Jacksonville Beach, 5.viii.1936 (T.B.
Mitchell); [NMNH]; 25♀♀ Martin Co., N27.0072 W080.1015, 4.vi.2007 (S.W. Droege); 7♀♀ Martin Co., N27.0125
W080.1028, 4.vi.2007 (S.W. Droege); [PCYU]; 3♀♀ Highland Co., Lake Placid, Archbold Biol. Stn., 8–14.ix.1987
(BRC Hym. Team); 2♀♀ Highland Co., Lake Placid, Archbold Biol. Stn., 15–21.ix.1987 (BRC Hym. Team); [CNC]; 1♀
Orange Co., Orlando, 12.ix.1992 (S.M. Fullerton); 2♀♀ Orange Co., Orlando, 19.x.1993 (S.M. Fullerton); [UCFC].
DNA Barcode. Available. Multiple sequences.
Comments. Uncommon. For additional comments see L. arantium (above).
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