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Extracted from: Gardner, J. and J. Gibbs. 2020. The ‘red-tailed’ Lasioglossum (Dialictus) (Hymenoptera: Halictidae)
of the western Nearctic. European Journal of Taxonomy 725: 1–242
Diagnosis
Both sexes of Lasioglossum tuolumnense can be recognized by the characters for the Lasioglossum
petrellum species complex (below), in addition to the characters given in the keys. Females are most
similar to L. griswoldi, and probably males as well (the male of L. griswoldi is not described). Females
of L. griswoldi have the malar space and supraclypeal area longer, and scutum slightly shinier and less
densely punctate. In addition, the geographic ranges of these two species are not known to overlap:
L. tuolumnense is only known from the mountains of California north to British Columbia, while
L. griswoldi is only known from Utah and Colorado.
Description
See Gibbs (2009b) for a complete description and figures.
Range
High elevations from southern California north to southern British Columbia (Fig. 87).
Floral Records
AMARYLLIDACEAE J. St.-Hil. Allium L. A. yosemitense Eastw. (G09) • ASTERACEAE Giseke:
Cirsium: C. occidentale (Nutt.) Jeps. C. o. var. californicum (A.Gray) D.J. Keil & C.E. Turner (G09) •
Eriophyllum: E. lanatum (Pursh) J. Forbes: E. L. var. integrifolium (Hook.) Smiley (G09) • Malacothrix
(G09) • Senecio: S. scorzonella Greene (G09) • ERICACEAE Juss. Arctostaphylos Adans. A. viscida
Parry (G09) • LILIACEAE Juss. Calochortus Pursh: C. weedii Alph. Wood • LIMNANTHACEAE
R.Br. Limnanthes R.Br. L. montana Jeps. (G09) • PLANTAGINACEAE Juss. Keckiella Straw:
K. breviflora (Lindl.) Straw (G09) • Penstemon Schmidel: P. bridgesii A.Gray • P. newberryi A.Gray
(G09) • ROSACEAE Juss. Chamaebatia Benth. C. foliolosa Benth. (G09).
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