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Retrieved from: Gibbs, J. 2010. Revision of the metallic species of Lasioglossum (Dialictus)in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa; 2591, 279-282
Halictus ruidosensis Cockerell, 1897c: 142. ♀ ♂.
Holotype. ♀ USA, New Mexico, Ruidoso Creek, 3.vii., (Wooton); [NMNH: 3652]. Examined.
Halictus (Chloralictus) insulsus Sandhouse, 1924: 29. ♂. [new synonymy]
Holotype. ♂ USA, New Mexico, Beulah, 18.viii., (W. Porter); [NMNH: 26428]. Examined.
Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) insulsum, p. 1114, L. (C.) ruidosense, p. 1117(catalogue);
Hurd, 1979: Dialictus insulsus, p. 1967, D. ruidosensis, p. 1971 (catalogue); Moure & Hurd, 1987:
Dialictus insulus, p. 109, D. ruidosensis, p. 128 (catalogue).
Diagnosis. Most similar to L. versans. See the diagnosis for that species.
Redescription. FEMALE. Length 5.80�6.16 mm; head length 1.39�1.56 mm; head width 1.37�1.54 mm;
forewing length 4.21�4.27 mm.
Colouration. Head and mesosoma very faintly golden green to bluish green, nearly brown on parts of face
and propodeum. Clypeus with apical half blackish brown, basal half, and supraclypeal area bronze. Antenna
dark brown, flagellum with ventral surface brown to reddish brown. Tegula dark reddish brown. Wing membrane
subhyaline, venation and pterostigma reddish brown. Legs dark brown, medio- and distitarsi reddish
brown. Metasoma dark brown, terga and sterna with apical margins reddish to translucent brownish yellow.
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
(1.5�2 OD). Metasomal terga with sparse, fine setae. T1 acarinarial fan absent, declivitous surface with
sparse, erect hairs (1.5 OD). T2�T4 with dense tomentum basolaterally. T2 apicolateral and T3�T4 apical
margins with very sparse fringes.
Surface sculpture. Face imbricate, punctation fine. Clypeus with apical half polished, punctation moderately
sparse (i=1�2d), Supraclypeal area with punctation sparse (i=1�3d). Lower paraocular and antennocular
areas with punctation moderately sparse, shallow (i=1�2d). Upper paraocular area, frons and ocellocular area
reticulate-punctate. Gena lineolate. Postgena imbricate. Mesoscutum tessellate-imbricate, punctation fine and
shallow, moderately dense between parapsidal lines (i=1�1.5d), dense laterad of parapsidal lines (i≤d), contiguous
on anterolateral portions. Mesoscutellum polished, weakly imbricate, submedial punctation moderately
dense (i=1�2d). Axilla punctate. Metanotum ruguloso-imbricate. Pre�pisternum weakly rugulose. Hypoepimeral
area ruguloso-imbricate. Mesepisternum granular-imbricate, obscurely punctate. Metepisternum dorsal
third rugoso-striate, ventral portion imbricate. Metapostnotum weakly striate, not extending much more than
halfway to posterior margin, posterior half weakly imbricate. Propodeum with dorsolateral slope weakly
imbricate, lateral surface imbricate-tessellate, posterior surface tessellate. Metasomal terga polished except
apical impressed zones weakly coriarious, punctation on basal halves distinct (i=1.5�2d), sparse on apical
halves (i=1�4d).
Structure. Head moderately elongate (length/width ratio = 1.00�1.04). Eyes convergent below (UOD/
LOD ratio = 1.18�1.27). 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 4 teeth. Metapostnotum moderately elongate (MMR
ratio = 1.18�1.21), posterior margin rounded onto posterior surface. Propodeum with oblique carina virtually
absent, lateral carina weak, reaching less than halfway to dorsal margin.
MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 5.31�
5.43 mm; head length 1.42�1.51 mm; head width 1.37�1.43 mm; forewing length 3.60�3.84 mm.
Colouration. Antenna dark brown, flagellum with ventral surface brownish red to brownish yellow. Legs
brown, medio- and distitarsi brownish red. Metasoma terga and sterna with apical margins brownish red.
Pubescence. Face below eye emargination with moderately sparse tomentum not obscuring surface.
Lower paraocular area with moderately dense tomentum obscuring surface.
Surface sculpture. Mesepisternum punctation shallow but more distinct than female. Metapostnotum posterior
half polished. Metasomal terga apical impressed areas impunctate.
Structure. Head moderately elongate (length/width ratio = 1.02�1.06). Eyes strongly convergent below
(UOD/LOD ratio = 1.54�1.58). Clypeus with apicolateral margins subparallel. Antennal sockets close (IAD/
OAD > 1.1). Frontal line carinate, ending 2 OD below median ocellus. Pedicel shorter than, or subequal to,
F1. F2 length 1.7�1.8X F1. F2�F10 moderately elongate (length/width ratio = 1.31�1.71). Metapostnotum
moderately elongate (MMR ratio = 1.17�1.41), posterior margin rounded onto posterior surface.
Terminalia. S7 with median lobe wide acuminate, apex truncate (Fig. 196G). S8 with apicomedial margin
convex (Fig. 196G). Genitalia as in Fig. 196E�F. Gonobase with ventral arms very widely separated. Gonostylus
moderately large, setae very long directed medially. Retrorse lobe short, narrow, strongly attenuated apically,
apical setae moderately elongate. Penis valve with strong inner crest.
Range. Alberta, British Columbia south to New Mexico, possibly north to Alaska (Fig. 194).
Additional material examined. CANADA: ALBERTA: 1♀ 4 km E Coaldale, Hwy 3, N49.74542
W112.53325, 863 m, 12.vi.2007 (Gibbs & Sheffield); BRITISH COLUMBIA: 1♀ Okanagan-Similkameen
Reg. Dist., Oliver, Sawmill Lk., N49.2072 W119.614, 740 m, 29.vii.2008 (L.R. Best); SASKATCHEWAN:
3♀♀ Grassland N.P., N49.0711 W106.52935, 830 m, 4.vi.2007 (Goulet, Boudreault & Fernandez); [PCYU];
YUKON TERRITORY: 2♀♀ Alaska Hwy, km 1706, N60�59′ W138�34′, 8.vi.1976 (ROM Fld. Pty.); [ROM];
USA: ARIZONA: 5♀♀ Cochise Co., Flys Pk. Trail, 2.vi.1999 (L. Packer); 6♀♀ Graham Co., Mt. Graham,
Shannon, 1.vi.1999 (L. Packer); COLORADO: 40♀♀ Jackson Co., N40.6017 W106.0726, 11�12.v.2004
(S.W. Droege); 4♀♀ Larimer Co., N40.6833 W105.3975, 11�12.v.2004 (S.W. Droege); 1♀ Park Co.,
N38.99338 W105.43515, 2595 m, 30.vii.2007 (Gibbs & Sheffield); MONTANA: 1♀ Gallatin Co., Hwy 287,
N44.80377 W111.17462, 2030 m, 23.vi.2007 (Gibbs & Sheffield); NEW MEXICO: 2♀♀ Lincoln Co., N of
Ruidoso, N33.45009 W105.68438, 2130 m, 10.viii.2007 (Gibbs & Sheffield); [PCYU]; 2♀♀ Lincoln Co.,
Ruidoso, 4.vii.1961 (G.C. Eickwort); [ROM]; 1♀ Otero Co., Cloudcroft, 8500 ft., 31.vii.1972 (G.C. Eickwort);
[CUIC]; NEVADA: 1♀ Clark Co., 1 mi SW Mummy Spr., 11S N4016746 E620965, 15.vii.2005 (S.
Higbee); UTAH: 1♀ Kane Co., Lick Wash, 12S N4135503 E395058, 27.v.2003 (B. Hansen); [PCYU].
Floral records. ANACARDIACEAE: Rhus, APIACEAE: Heracleum maximum, ASTERACEAE: Carduus,
Chrysothamnus viscidiflorus, Crepis acuminata, Machaeranthera canescens, Senecio serra, Solidago
canadensis, Taraxacum, BRASSICACEAE: Erysimum, Nasturtium microphyllum, Sisymbrium, FABACEAE:
Medicago sativa, Oxytropis, GERANIACEAE: Geranium, HYDRANGEACEAE: Jamesia americana,
Phacelia, LAMIACEAE: Salvia, LINACEAE: Linum lewisii, POLEMONIACEAE: Polemonium, RANUNCULACEAE:
Clematis ligusticifolia, RHAMNACEAE: Ceanothus fendleri, SCROPHULARIACEAE: Castilleja
integra, Mimulus luteus, Penstemon rostriflorus, Scrophularia, UNKNOWN: �Geum trifidum�.
Biology. Evans, 1970: (predators).
Comments. Common. DNA barcode data from specimens collected throughout out its range suggest that
L. ruidosense may in fact be a complex of multiple closely related species and at least three of these possible
species occur in Western Canada (J. Gibbs, unpublished data). Individuals in this putative species-complex
occur at high elevations in the southwestern USA. Morphological examination does not support the recognition
of multiple Canadian species. Evidence from additional sources (genetic, behavioural, etc.) or more
detailed morphological study is needed to determine which dataset is misleading. Sequence data from an
Alberta specimen closely match those of specimens collected near the type locality. As such, even if this is
cryptic species complex, the true L. ruidosense presumably still occurs in Canada.
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Identification | |
Extracted by Gibbs J., 2011. Revision of the metallic Lassioglossum (Dialictus) of the eastern North American (Hymenoptera: Halictidae: Halictini). Zootaxa.
Diagnosis. Members of the L. ruidosense species-group are easily recognised by the following combination of characters in addition to the subgeneric characters of Dialictus. Head and mesosoma dull metallic, mesoscutal punctures widely separated between parapsidal lines, mesepisternum granular-imbricate, metasomal terga dark brown. Females: T1 anterior surface with evenly distributed erect hairs but no appressed hair fan, propodeum usually with lateral carina short not reaching dorsal margin. Males: Gonocoxite basally much wider than gonobase, gonostylus with medially directed elongate hairs, penis valve with strong dorsal crest.
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.
In this excerpt, Lasioglossum ruidosense is known as the now synonymized Halictus insulsus.
Male.—About 5 mm. long; head and thorax dark blue; abdomen
black; pubescence white, sparse. Facial quadrangle about as broad
as long; orbits converging below; antennae dark brown, the second
and third joints of equal length; flagellum little paler beneath; front
above the antennae very closely punctured; the lower portion of the
front, supraclypeal area and clypeus more sparsely punctured; clypeus black, produced more than half its length below the lower margins of the eyes. Mesothorax and scutellum with moderately coarse, shallow punctures, about the diameter of a puncture apart; disk of propodeum without an inclosing rim, plicatulate at the base only,
the apex is polished; mesopleurae with shallow punctures; sides of
propodeum punctured; truncation not sharply defined, but distinct
laterally; tegulae dark, impunctate. Abdomen slender, the only punctures piliferous; the apical margins of segments brownish. Wings
faintly dusky; anterior wing 4 mm. long; stigma and nervures dark;
the second submarginal cell as broad at the base as it is high, but
contracted almost one-half above, receiving the first recurrent nervure very near the apex; third submarginal about twice as long as the
second on marginal. Legs black.
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Updated: 2024-04-19 13:57:43 gmt
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