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Lasioglossum achilleae (Mitchell, 1960)
Dialictus achilleae Mitchell, 1960

Life   Insecta   Hymenoptera   Apoidea   Halictidae   Lasioglossum
Subgenus: Dialictus

Lasioglossum achilleae FEM mm x f
© Copyright Laurence Packer 2014 · 7
Lasioglossum achilleae FEM mm x f

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    Identification Summary: This species is moderate sized; very rare; complete to nearly complete carina on rim of propodeal triangle; glossy scutum and propodeal triangle; lateral propodeal carinae of rear face of the propodeum complete; strong v-shaped carinae on sides of dorsal surface of propodeal triangle; scutum dark blue with a green sheen; very few pits on supraclypeus; glossy scutum with low pit density both in center and on the sides between tegula and nautalices. We would be very interested in seeing specimens of this species!

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Lasioglossum achilleae, Barcode of Life Data Systems
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Lasioglossum achilleae, Barcode of Life Data Systems
Overview
Retrieved from: Gibbs, J. 2010. Revision of the metallic species of Lasioglossum (Dialictus)in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa; 2591, 49-50


Dialictus achilleae Mitchell, 1960: 377. ♀. Holotype. ♀ USA, North Carolina, Cruso, June 25, 1934, on Achillea, (T.B. Mitchell); [NCSU]. Examined.


Taxonomy. Krombein, 1967: Lasioglossum (Dialictus) achilleae, p. 462 (catalogue); Hurd, 1979: Dialictus achilleae, p. 1963 (catalogue); Moure & Hurd, 1987: Dialictus achilleae, p. 87.


Diagnosis. Females of L. achilleae can be recognised by the diagnostic combination of a small size (4.27– 5.06 mm), wide head (length/width ratio = 0.92), polished mesoscutum due to weak microsculpture withsparse punctation even laterad of the parapsidal lines and strong oblique carinae of the propodeum. The Eastern USA species L. apopkense (Robertson) is most similar but has the mesoscutum distinctly dull due to microsculpture. Lasioglossum apopkense only occurs as far north as the Pine Barrens of New Jersey (personal observation). Male unknown.


Redescription. FEMALE. Length 4.27–5.06 mm; head length 1.32–1.37 mm; head width 1.44–1.49 mm; forewing length 3.72–3.78 mm.


Colouration. Head and mesoscutum pale bluish green to pale green. Mandible dark orange. Clypeus with apical half blackish brown. Antenna dark brown, flagellomeres with ventral surface reddish brown. Mesoscutum with anteromedial area brassy. Propodeum with dorsal surface blue. Tegula amber. Wing membrane hyaline with pale setae, venation and pterostigma pale whitish yellow. Legs brown, metabasitarsus infused with dark amber. Metasoma brown, terga and sterna with apical margins reddish brown, T3–T4 apical margins translucent yellow.


Pubescence. Dull white. Mostly sparse. Head and mesosoma with sparse woolly hairs (1–2 OD), longest on genal beard, metanotum and mesopleuron (2–2.5 OD). Lower paraocular area with tomentum. Gena with sparse tomentum. Propodeum with plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with sparse, fine setae. T1 acarinarial fan sparse with wide dorsal opening, equal to width of lateral fan. T2–T3 basolaterally and T4 entirely with very sparse tomentum.


Surface sculpture. Face polished, weakly imbricate, punctation moderately fine. Clypeus polished, punctation sparse (i=1–3d). Supraclypeal area with punctation sparse (i=3–5d). Lower paraocular area punctation dense (i

Structure. Head wide (length/width ratio = 0.92). Eyes weakly convergent below (UOD/LOD ratio = 1.22–1.23). Clypeus 1/3 below suborbital tangent, apicolateral margins convergent. Antennal sockets close (IAD/OAD < 0.5). Frontal line carinate, ending 2 OD below median ocellus. Eye wider than gena. Parapsidal and medial lines deep. Inner metatibial spur pectinate with 3 teeth. Metapostnotum moderately elongate (MMR ratio = 1.08–1.24), posterior margin carinate, separated from posterior surface. Propodeum with dorsolateral slope delimited below by strong oblique carina forming an obtuse angle, lateral carina strong, reaching dorsal margin. MALE. Unknown


Range. Southern Ontario south to Georgia

Identification
Extracted by Gibbs J., 2011. Revision of the metallic Lassioglossum (Dialictus) of the eastern North American (Hymenoptera: Halictidae: Halictini). Zootaxa.

Holotype. ♀ USA, North Carolina, Cruso, June 25, 1934, on Achillea, (T.B. Mitchell); [NCSU]. Examined. Taxonomy. Krombein, 1967: Lasioglossum (Dialictus) achilleae, p. 462 (catalogue); Hurd, 1979: Dialictus achilleae, p. 1963 (catalogue); Moure & Hurd, 1987: Dialictus achilleae, p. 87; Gibbs, 2010b: Lasioglossum (Dialictus) achilleae ♀, p. 49 (redescription, key).

Diagnosis. Female L. achilleae can be recognised by the following diagnostic combination: mesoscutum polished due to lack of microsculpture, punctures sparse throughout; propodeum with strong oblique carina; and metapostnotum delimited from posterior propodeal surface by sharp transverse angle or carina. They are most similar to L. apopkense, which has mesoscutum dull due microsculpture. Male L. achilleae can be recognised by the following diagnostic combination: F1 short (F2:F1 ratio = 2.5–2.8); mesoscutum polished, punctures sparse throughout (Fig.46); propodeum rugose with strong oblique carina; metasomal terga sparsely punctate, impunctate on apical impressed areas; and metasomal sterna with sparse pubescence. They are most similar to L. apopkense, L. lineatulum, and L. novascotiae. Male L. apopkense have mesoscutum dull due to strong microsculpture. Male L. lineatulum have F1 longer (F2:F1 ratio = 1.6–1.8) and more abundant sternal hairs. Male L. novascotiae have head longer and denser punctures on metasomal terga.

Description. MALE. Similar to female (see Gibbs 2010b) except for the usual secondary sexual characters and as follows. Length 4.50–4.56 mm; head length 1.25–1.45 mm; head width 1.33–1.53 mm; forewing length 3.62–3.80 mm. Colouration. Flagellum with ventral surface reddish brown. Pterostigma pale brownish yellow. Legs brown, except tarsi pale brownish yellow. Pubescence. Face below eye emargination with relatively dense tomentum partially obscuring surface, denser on lower paraocular area. Metasomal sterna sparsely pubescent, S3–S4 with small apicolateral tufts (1 OD).

Surface sculpture. Mesoscutum polished, microsculpture faint; punctation sparse between parapsidal lines (i=1–3d) and laterad of parapsidal line (i=1–2d). Propodeal dorsolateral slope coarsely rugose. T2 apical impressed area impunctate. Structure. Head wide (length/width ratio = 0.94–0.95). Eyes strongly convergent below (UOD/LOD ratio = 1.48– 1.68). Clypeus 2/3 below suborbital tangent, apicolateral margins weakly convergent. Antennal sockets distant (IAD/ OAD > 1.0). Frontal line carinate, ending 1.5 OD below median ocellus. Pedicel subequal to F1. F2 length 2.5–2.8X F1. F2–F10 elongate (length/width ratio = 1.50–1.83). Metapostnotum moderately elongate (MMR ratio = 1.20–1.27), posterior margin sharply angled onto posterior propodeal surface. Terminalia. Not examined. Range. Southern Ontario south to south to Georgia. USA: GA, MA, MI, NC, NY. CANADA: ON. Additional specimens examined. USA: NEW YORK: 1♀3♂♂ Albany Co., Colonie, 20.viii.1969, pine barrens, (G. & K. Eickwort); [CUIC].

DNA Barcode. Available. Single sequence. Comments. Uncommon.


Names
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FamilyScientific name @ source (records)
Asteraceae  Solidago @ CUIC_ENT (3)
Fabaceae  Amorpha canescens @ CUIC_ENT (1)

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Updated: 2019-02-17 14:28:52 gmt
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