Lasioglossum (Dialictus) ceanothi (Mitchell)

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216 : 66-67

publication ID 10.5281/zenodo.1049595

publication LSID

persistent identifier

treatment provided by


scientific name

Lasioglossum (Dialictus) ceanothi (Mitchell)


Lasioglossum (Dialictus) ceanothi (Mitchell)

( Figure 75–76 View FIGURE 75 View FIGURE 76 )

Dialictus ceanothi Mitchell, 1960: 386 . Ƥ.

Holotype. Ƥ USA, North Carolina, Wayne Co. , 1955, on Ceanothus americanus, (H.V. Weems, Jr.) ; [ FSCA]. Examined.

Taxonomy. Krombein, 1967: Lasioglossum (Dialictus) ceanothi , p. 463 (catalogue); Hurd, 1979: Dialictus ceanothi , p. 1965 (catalogue); Moure & Hurd, 1987: Dialictus ceanothi , p. 94 (catalogue).

Diagnosis. Female L. ceanothi can be recognised by the following diagnostic combination: head wide (length/width ratio = 0.90) ( Fig. 75 View FIGURE 75 B); mesoscutal punctures relatively coarse, moderately dense between parapsidal lines (i= 1–1.5 d) ( Fig. 76 View FIGURE 76 ); mesepisternum reticulate-rugose; propodeal carinae weak; and T 1 polished with acarinarial fan sparse but lacking a dorsal opening. They are similar to L. foveolatum and L. timothyi . Female L. foveolatum have supraclypeal area strongly protuberant lower paraocular area sparsely punctate, and parapsidal lines deep and wide. Female L. timothyi have strong propodeal carinae ( Fig. 25 View FIGURE 25 A) and T 1 acarinarial fan dense.

Male unknown.

Description. FEMALE. Length 4.84 –5.00 mm; head length 1.40–1.42 mm; head width 1.53–1.57 mm; forewing length 3.75–3.88 mm.

Colouration. Head and mesosoma golden green with some faint bluish reflections. Clypeus with apical half blackish brown, basal half and supraclypeal area bronze. Antenna dark brown, F 2 –F 10 with ventral surface reddish brown. Tegula amber. Wing membrane subhyaline, venation and pterostigma amber. Legs brown, except tarsi reddish brown. Metasoma dark brown, terga and sterna reddish apically.

Pubescence. Dull white. Moderately 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 with sparse subappressed tomentum not obscuring surface. Metanotum anteromedial margin with tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metepisternum without tomentum. Metasomal terga with moderately dense, fine hairs. T 1 acarinarial fan sparse, complete dorsally. T 2 –T 3 basolaterally and T 4 entirely with tomentum partially obscuring surface. T 2 apicolateral and T 3 –T 4 apical margins with dense apical fringes.

Surface sculpture. Face imbricate, punctation moderately coarse. Clypeus polished, basal margin imbricate, punctation moderately dense (i= 1–2 d). Supraclypeal area with punctation moderately dense (i= 1–1.5 d). Lower paraocular area punctation dense (i≤d). Antennocular area punctation moderately dense (i= 1–1.5 d). Upper paraocular area and frons reticulate-punctate. Ocellocular area distinctly punctate (i≤d). Gena and postgena weakly carinulate. Mesoscutum weakly imbricate, nearly polished except medially, punctation moderately coarse and dense between parapsidal lines (i= 1–1.5 d), dense laterad of parapsidal line (i≤d), and anterolateral portion punctate-reticulate. Mesoscutellum polished, submedial area punctation sparse (i= 1.5–2.5 d). Axilla punctate. Metanotum ruguloso-imbricate. Preëpisternum rugose. Hypoepimeral area and mesepisternum reticulate-rugose. Metepisternum with dorsal half rugoso-carinulate, ventral half imbricate. Metapostnotum with coarse rugae reaching posterior margin, submedially with anastomosing rugae. Propodeum with dorsolateral slope carinulate anteriorly, rugulose-imbricate posteriorly, lateral surface rugulose-imbricate, posterior surface tessellate. Metasomal terga polished except apical T 1 declivitous surface and apical impressed areas weakly coriarious. T 1 dorsal surface punctation sparse (i= 2–5 d). T 2 –T 4 punctation moderately sparse medially (i= 1–3 d), denser laterally (i= 1–1.5 d).

Structure. Head very wide (length/width ratio = 0.90–0.92). Eyes convergent below (UOD/LOD ratio = 1.22–1.27). Clypeus 1 / 2 below suborbital tangent, apicolateral margins convergent. Antennal sockets close (IAD/OAD <0.5). Frontal line carinate, ending 2 OD below median ocellus. Supraclypeal area distinctly convex. Inner metatibial spur pectinate with 3 branches. Metapostnotum moderately elongate (MMR ratio = 1.13–1.17), narrowly rounded onto posterior surface. Propodeum with oblique carina virtually absent, lateral carina reaching 2 / 3 distance to dorsal margin.

MALE. Unknown.

Range. North Carolina, north to Michigan, west to Missouri ( Fig. 74 View FIGURE 74 ). USA: MI, MO, NC.

Additional material examined. MICHIGAN: 1 Ƥ paratype [head glued to label not conspecific] Mackinac Co., 6.vii. 1957 (R. & K. Dreisbach); [ CUIC]; MISSOURI: 1 Ƥ paratype Willard, (A.E. Brower); [ CUIC]; NORTH CAROLINA: 1 Ƥ paratype Wayne Co. 1955 (H.V. Weems, Jr.); [ CUIC].

Floral records. RHAMNACEAE : Ceanothus americanus .

DNA Barcode. Unavailable.

Comments. Rare. Only specimens in the type series have been examined.


Florida State Collection of Arthropods, The Museum of Entomology


Cornell University Insect Collection


Department of Natural Resources, Environment, The Arts and Sport














Lasioglossum (Dialictus) ceanothi (Mitchell)

Gibbs, Jason 2011

Dialictus ceanothi

Mitchell 1960: 386