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Lasioglossum pacatum (Sandhouse, 1924)
Halictus (Chloralictus) pacatus Sandhouse, 1924; Dialictus pacatus (Sandhouse, 1924)

Life   Insecta   Hymenoptera   Apoidea   Halictidae   Lasioglossum
Subgenus: Dialictus



Lasioglossum pacatum FEM CFP-
© Copyright Laurence Packer 2014 · 7
Lasioglossum pacatum FEM CFP-

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Lasioglossum pacatum, F, back, UT, Garfield County
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Lasioglossum pacatum, F, back, UT, Garfield County
Lasioglossum pacatum, F, side, UT, Garfield County
© Copyright source/photographer · 5
Lasioglossum pacatum, F, side, UT, Garfield County

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Overview
Retrieved from: Gibbs, J. 2010. Revision of the metallic species of Lasioglossum (Dialictus)in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa; 2591, 228-230


Halictus (Chloralictus) pacatus Sandhouse, 1924: 16. ♀.
Holotype. ♀ USA, Colorado, Peaceful Valley, 1919, (Cockerell), [NMNH: 26407]. Examined.


Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) pacatum, p. 1116 (catalogue); Hurd, 1979: Dialictus

pacatus, p. 1969 (catalogue); Moure & Hurd, 1987: Dialictus pacatus, p. 119 (catalogue).



Diagnosis. Females of L. pacatum can be recognised by the diagnostic combination of a relatively large

size (5.1�6.4 mm), green head and mesosoma, round to relatively elongate head (length/width ratio = 0.96�

1.01), lower face distinctly smooth, gena narrower than eye, mesoscutal punctures moderately sparse on central

disc (i=1�2d), rugulose mesepisternum, metapostnotum with longitudinal rugae not reaching posterior

margin, propodeum oblique carina virtually absent, dark brown metasomal terga polished due to lack of

microsculpture, T1 acarinarial fan strong but with dorsal opening, T2 basolaterally and T3�T5 entirely with

moderately dense tomentum, and T3�T4 with weak apical fringes. They are similar to L. laevissimum, L.

marinense, L. ephialtum and L. viridatulum (Cockerell). Female L. laevissimum have a wide head (length/

width ratio = 0.89�0.95) and a gena wider than the eye. Female L. marinense have virtually no tomentum on

the metasomal terga and a very weak T1 acarinarial fan that is present only as two small lateral hair patches.

Female L. ephialtum have the metapostnotum completely rugoso-striate and moderately strong fringes on the

metasomal terga. Female L. viridatulum have the lower portion of the face less smooth with distinct lines on

the apical half of the clypeus.

Male unknown.



Redescription. FEMALE. Length 5.06�6.35 mm; head length 1.54�1.75 mm; head width 1.52�1.78 mm;

forewing length 3.97�4.70 mm.



Colouration. Head and mesosoma greenish blue. Clypeus with apical half blackish brown and basal half,

and supraclypeal area more greenish or bronze. Antenna dark brown, flagellum with ventral surface orangebrownish

yellow. Tegula reddish brown. Wing membrane subhyaline, venation and pterostigma amber. Legs

brown, medio- and distitarsi and sometimes metabasitarsus base brownish yellow. Metasomal blackish brown,

terga and sterna with apical margins reddish brown.



Pubescence. Dull white. Sparse. 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 without

subappressed tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces

(2�2.5 OD). Metasomal terga with moderately sparse, fine setae. T1 acarinarial fan incomplete, dorsal open ing equal in width to lateral appressed hairs. T2 basal portion and T3 basal margin with appressed tomentum.

T4 with sparse tomentum partially obscuring surface. T2 apicolateral and T3�T4 apical margins with sparse

fringes.



Surface sculpture. Face imbricate, punctation moderately fine. Clypeus with apical half polished, punctation

unevenly spaced (i=1�3d). Supraclypeal area with punctation moderately sparse (i=1�2d). Lower paraocular

area punctation dense (i≤d). Antennocular area punctation moderately dense (i=1�1.5d). Upper

paraocular area and frons punctate-reticulate. Ocellocular area obscurely punctate (i≤d). Gena lineolate. Postgena

imbricate. Mesoscutum imbricate, punctation moderately fine, moderately sparse between parapsidal

lines (i=1�2d), dense laterad of parapsidal lines (i≤d), contiguous on anterolateral portions (i≤d). Mesoscutellum

similar to mesoscutum, submedial punctation moderately sparse (i=1.5�2.5d). Axilla punctate. Metanotum

imbricate. Pre�pisternum rugulose. Hypoepimeral area imbricate. Mesepisternum dorsal half weakly

rugulose, ventral half imbricate. Metepisternum with dorsal half rugoso-striate, ventral half imbricate. Metapostnotum

incompletely rugoso-striate, posterior margin imbricate. Propodeum with dorsolateral slope rugulose,

lateral surface imbricate-rugulose, posterior surface imbricate. Metasomal terga weakly coriarious,

punctation on basal halves moderately sparse (i=1�3d), apical half impunctate except along premarginal line

and a few scattered punctures on marginal zone.



Structure. Head wide to round (length/width ratio = 0.96�1.01). Eyes convergent below (UOD/LOD ratio

= 1.18�1.22). Clypeus 2/3 below suborbital tangent, apicolateral margins strongly convergent. Antennal sockets

close (IAD/OAD < 0.5). Frontal line carinate, ending <2.5 OD below median ocellus. Gena narrower than

eye. Inner metatibial spur pectinate with 3�5 teeth. Metapostnotum moderately elongate (MMR ratio = 1.19�

1.33), posterior margin rounded onto posterior surface. Propodeum with oblique carina obscure, lateral carina

short, not reaching dorsal margin.

MALE. Unknown.



Range. Colorado to British Columbia (Fig. 165).



Additional material examined. CANADA: BRITISH COLUMBIA: 1♀ Abbotsford, N49�07�41��

W122�25�05�� 13.v.2003 (C. Ratti); 1♀ Abbotsford, N49�07�41�� W122�25�05�� 16.v.2003 (C. Ratti); 1♀

Abbotsford, N49�07�41�� W122�25�05�� 25.v.2003 (C. Ratti); 1♀ Abbotsford, N49�07�41�� W122�25�05��

31.v.2003 (C. Ratti); [PCYU]; 1♀ Aldergrove, 50�100 m, 3.vii.1978 (N.L.H. Krauss); [AMNH]; 1♀ Cowichan

River P.P, 10 km E Lake Cowichan, N48�46�39�� W123�56�30.2�� 11.v.2005, wpt (E. Elle); 1♀ Fort

Langley, N49�09�27�� W122�29�56�� 18.vi.2004 (C. Ratti); 1♀ Mission, N49�12�36�� W122�14�46��

19.v.2003 (C. Ratti); 2♀♀ Mission, N49�12�36�� W122�14�46�� 22.v.2003 (C. Ratti); 1♀ Pitt Meadows,

N49�14�59�� W122�43�02�� 5.vii.2003 (C. Ratti); 1♀ Richmond, N49�08�41�� W123�04�24�� 9.iv.2004 (C.

Ratti); 1♀ Richmond, N49�08�41�� W123�04�24�� 14.v.2003 (C. Ratti); 1♀ Surrey, N49�05�54��

W122�47�31�� 4.v.2003 (C. Ratti); 2♀♀ Surrey, N49�05�54�� W122�47�31�� 14.v.2003 (C. Ratti); 1♀ Surrey,

N49�05�54�� W122�47�31�� 20.v.2003 (C. Ratti); 1♀ Westham Island, N49�05�18�� W123�09�50�� 12.v.2003

(C. Ratti); [PCYU]; USA: COLORADO: 1♀ Gilpin Co., HWY 19, N39.87015 W105.46551, 2�31.viii.2007,

(Gibbs & Sheffield); [PCYU].



Comments. Common. This species is part of the L. viridatum species-group and is very similar to L. viridatulum.

Both were originally described from Colorado. Additional study is needed to determine if these

names are synonymous.

Identification
Extracted from: Sandhouse G. A. New North American Species of Bees Belonging to the Genus Halictus (Chloralictus). No. 2532 - Proceedings U.S. National Museum. Vol. 65, Art. 19.

Appears as Halictus Pacatus in this excerpt.

Female.—About 6 mm. long; head and thorax dark green; abdomen black ; pubescence white. Facial quadrangle longer than broad ; orbits converging below ; antennae dark, the flagellum scarcely paler beneath; front closely punctured; sides of face with shallow open punctures; supraclypeal area and upper portion of clypeus microscopically lineo- late and coarsely punctured ; lower half of clypeus shining black, with few coarse punctures. Mesothorax broad, microscopically tessellate, with moderately close, but coarse punctures evenly distributed over the surface; scutellum finely punctured, two polished spots on the disk; disk of propodeum without a distinct inclosing rim, microscopically tessellate, with few slightly wrinkled plicae reaching the apex; truncation well defined laterally; tegulae dark testaceous, impunctate. Abdomen obovate, impunctate; the first segment almost without hairs, the other segments sparsely clothed with short hairs. Wings somewhat dusky; anterior wing about 4.5 mm. long; stigma and nervures testaceous; second submarginal cell slightly higher than broad receiving the first recurrent nervure near the apex; third submarginal little longer than second on marginal. Legs dark with yellowish white hairs; hind spur pectinate with four moderately long teeth.

Habitat.—Peaceful Valley, Colorado, 1919 (Cockerell). Two speci- mens.

Names
Scientific source:
Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Taraxacum officinale @ BBSL (1)
_  Withheld @ BBSL__ZION (2)

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