Retrieved from: Gibbs, J. 2010. Revision of the metallic species of Lasioglossum (Dialictus)in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa; 2591, 358-362
Holotype. ♀ CANADA, British Columbia, Pitt Meadows, N49°13΄25΄΄ W122°45΄12΄΄, comm. cranberry field Banns
WPT 25.vi.2005 (C. Ratti); [PCYU]
Diagnosis. Females of L. yukonae can be recognised by the diagnostic combination of moderately wide to
round head (length/width ratio = 0.961.00), tessellate mesoscutum with dense punctures dense including the
medial portion, mesepisternum dull without evident irregular punctures, metapostnotum with strongly anastomosing
rugae (Fig. 240E), T1 acarinarial fan complete dorsally, metasomal terga polished with faint metallic
reflections and T3T4 with moderately dense tomentum. They are most similar to L. sheffieldi and L. perpunctatum.
Female L. sheffieldi have a longer head (length/width ratio = 1.001.01), sparse mesoscutal punctures
medially and shiny mesepisternum with evident punctures. Female L. perpunctatum have a wide head
(length/width ratio = 0.950.96) and primarily longitudinal rugae on the metapostnotum.
Males of L. yukonae can be recognised by the diagnostic combination of head moderately long (length/
width ratio = 1.02), face below eye emarginaton obscured by dense white tomentum, flagellomeres moderately
short (length/width ratio = 1.551.61), mesepisternum reticulate-punctate, tegula moderately elongate
with weak posterior angle, and metabasitarsus pale brown. They are most similar to L. albipenne, L. perpunctatum
and L. sheffieldi. Male L. albipenne have metabasitarsus yellow. Male L. perpunctatum have facial
tomentum limited to lower paraocular area. Male L. sheffieldi have a longer head (length/width ratio = 1.06
1.08) with less extensive facial tomentum.
Description. FEMALE. Length 5.866.80 mm; head length 1.611.66 mm; head width 1.611.70 mm;
forewing length 4.154.58 mm.
Colouration. Head and mesosoma pale green with bluish and golden reflections. Clypeus with apical half
blackish brown and basal half, and supraclypeal area bronze. Antenna dark brown, flagellum with ventral surface
reddish brown. Tegula translucent reddish amber. Wing membrane subhyaline, venation and pterostigma
pale amber. Legs brown, medio- and distitarsi reddish. Metasomal blackish brown, terga and sterna with apical
margins amber to pale 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 (22.5 OD). Lower paraocular area and gena
with sparse, subappressed tomentum, not obscuring surface. Propodeum with dense plumose hairs on lateral
and posterior surfaces (22.5 OD). Metasomal terga with moderately dense, fine setae. T1 acarinarial fan
dense, complete dorsally. T1 dorsolateral portion with small patch of appressed tomentum. T2 basolaterally
and T3T5 entirely with tomentum partially obscuring surface. T2 apicolateral and T3T4 apical margins
with weak fringes.
Surface sculpture. Face imbricate, punctation moderately fine. Clypeus with apical half polished, basal
punctation dense (i≤d). Supraclypeal area with punctation sparse (i=13d). Lower paraocular and antennocular
areas with punctation dense (i≤d). Upper paraocular area and frons punctate-reticulate. Ocellocular area
minutely punctate (i≤d). Gena lineolate. Postgena polished, weakly lineolate. Mesoscutum imbricate-tessellate,
punctation fine, dense between parapsidal lines (i≤d), except on anteromedial and submedial areas (i=1
1.5d), and dense laterad of parapsidal line (i≤d), contiguous on anterolateral portion of disc. Mesoscutellum
polished, submedial punctation moderately dense (i=12d). Axilla punctate. Metanotum imbricate. Preλpisternum
rugulose. Hypoepimeral area imbricate, obscurely punctate. Mesepisternum ruguloso-imbricate,
obscurely punctate. Metepisternum with dorsal half rugoso-striate, ventral half imbricate. Metapostnotum
with strong anastomosing rugae. Propodeum with dorsolateral slope rugose, lateral surface ruguloso-imbricate,
posterior surface rugulose. Metasomal terga polished except T1 declivitous surface weakly coriarious,
punctation fine, on basal halves dense (i=11.5d), on apical half moderately sparse (i=23d).
Structure. Head moderately wide to round (length/width ratio = 0.961.00). Eyes weakly convergent
below (UOD/LOD = 1.071.16). Clypeus 2/3 below suborbital tangent, apicolateral margins strongly convergent.
Antennal sockets close (IAD/OAD < 0.5). Frontal line carinate, ending 2 OD below median ocellus.
Gena narrower than eye. Hypostomal carina parallel. Tegula ovoid, somewhat elongate with slight posterior
angle (Fig. 241D). Inner metatibial spur pectinate with 34 teeth. Metapostnotum crescentic. Metapostnotum
moderately elongate (MMR ratio = 1.231.27), posterior margin weakly angled onto posterior surface. Propodeum
with oblique carina weak, lateral carina not reaching dorsal margin.
MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 4.96
mm; head length 1.51 mm; head width 1.49 mm; forewing length 3.87 mm.
Colouration. Head and mesosoma blue. Flagellum with ventral surface reddish brown. Wings hyaline.
Tibial bases and medio- and distitarsi reddish brown. Metasoma dark brown; apical margins pale translucent
Pubescence. Face below eye emargination with moderately dense tomentum obscuring surface, densest on
lower paraocular area, sparse on distal half of clypeus. Gena with sparse tomentum. T2T4 basolaterally with
very sparse tomentum. S2S5 apicolaterally with very sparse plumose hairs (1 OD).
Surface sculpture. Mesocutum polished, punctation between parapsidal lines sparse (i=12.5). Mesepisternum
polished, reticulate-punctate. Metapostnotum posterior margin smooth, polished. Propodeum with
dorsolateral slope rugulose.
Structure. Head moderately elongate (length/width ratio = 1.02). Eyes convergent below (UOD/LOD ratio
= 1.22). Antennal sockets distant (IAD/OAD > 1.0). Pedicel length subequal to F1. F2 length 1.7X F1. F2
F10 moderately short (length/width ratio = 1.551.61). Metapostnotum moderately elongate (MMR ratio =
1.27), posterior margin rounded onto posterior surface.
Terminalia. S7 with median lobe elongate, columnar, apex rounded (as in Fig. 210F). S8 with apicomedial
margin weakly convex (as in Fig. 210F). Genitalia similar to Fig. 210DE. Gonobase with ventral arms narrowly
separated. Gonostylus small, dorsal setae elongate. Retrorse lobe elongate, weakly attenuated apically.
Range. Southwestern British Columbia north to the Yukon Territory (Fig. 239).
Allotype. CANADA: YUKON TERRITORY: ♂ 14 mi E. Dawson, 1300′, 3.viii.1962 (R.E. Leech);
Paratypes. CANADA: BRITISH COLUMBIA: 1♀ 9.v.2001; [PCYU]; 2♀♀ Saanich, Island View Beach,
N48°33΄59΄΄ W123°22΄02΄΄, 19.vi.1994 (Nadel & Hannah); [RBCM]; YUKON TERRITORY: 1♀ Kluane
N.P., 10.vii.2006 (L. Packer); Carcross Dunes, vii.2006 (L. Packer); [PCYU].
Etymology. The specific epithet has a dual meaning. It refers to the location of the first recognised specimens
from the Yukon Territory and is also dedicated to Yuko Nozoe for putting up with my infatuation with
Floral records. ROSACEAE: Prunus serrulata.
Comments. Rare. This species is only known from a small number of individuals from sandy areas
(beaches or dunes). The same is true for its possible sister species L. sheffieldi.