Hylaeus dilatatus ( Kirby 1802 ), 2008

Notton, David G. & Dathe, Holger H., 2008, William Kirby’s types of Hylaeus Fabricius (Hymenoptera, Colletidae) in the collection of the Natural History Museum, London, Journal of Natural History 42 (27 - 28), pp. 1861-1865 : 1863-1865

Hylaeus dilatatus ( Kirby 1802) stat. rev.

Melitta dilatata Kirby, 1802: 39 . Lectotype „: England, Suffolk, Barham (BMNH). Here designated.

Labels on lectotype

5 „ [Kirby’s handwritten label]; 63/39 [Blue paper disc, BMNH accession number 1863–39]; Syntype; B.M.Type / Hym/ 17a2871; Syntype „ / Melitta / dilatata Kirby / det. D. Notton, 1995 [Lectotype „ ].

Redescription of lectotype

Male. Face with extensive yellow markings, in profile with clypeus, supraclypeal and intertorular areas not greatly produced, paraocular markings not curving inwards above toruli, and without a small oval shiny patch apically; malar space short, 0.3 times basal width of mandible. Antennal scape greatly dilated, suboval, about as wide as long, convex on one side, concave on the other, its dorsal half, radicle and apex black and the ventral half yellow. Mandible with external face largely yellow, teeth brown. Metanotum coarsely reticulate. Disc of gastral tergite 1 with numerous distinct punctures; disc and medial posterior margin of tergite 1 microreticulate; gastral sternites 2–4 posteriorly with sparse hairs, not forming a distinct fringe or patches and not obscuring the underlying sternites; sternites 4 and 5 each with a low transverse polished tubercle; sternite 3 with a similar but less clearly discernable tubercle; gastral sternite 8 not protruding; gonostyli with only tips exserted, the exposed parts subtriangular, blunt. The condition of the specimen is poor, with apices of both antennae, part of right scape, right side of head, right foreleg (tibia and beyond), right hind leg (tibia and beyond) and part of margin of right fore wing missing; generally dirty.

Notes

One specimen was found over the name dilatata in Kirby’s collection. This agreed with the original description given by Kirby (1802). Although Kirby says that this species was most rare ‘‘rarissima’’, there is no direct evidence that there was a single specimen, so it is regarded here as a single surviving syntype. A lectotype designation is made to fix the usage of the name. Previously, H. dilatatus was considered to be a junior synonym of H. annularis however, in the current paper, H. annularis has been shown to be a different species, and H. dilatatus is now the valid name of the species formerly known as H. annularis .

Nomenclatural summary

Hylaeus Fabricius, 1793

Subgenus Lambdopsis Popov, 1939

Hylaeus (Lambdopsis) annularis ( Kirby 1802)

5? H. geniculatus Curtis 1831 syn. nov.

5 H. spilotus Förster 1871 syn. nov.

5 H. geniculatus Förster 1871 preocc. syn. nov.

5 H. masoni (Saunders 1894) syn. nov.

5 H. discophorus (Vachal 1895) syn. nov.

Hylaeus (Lambdopsis) dilatatus ( Kirby 1802) stat. rev.

5 H. varians (Spinola 1806)

5 H. distans (Eversmann 1852)

5 H. cervicornis (Costa 1858)

5 H. compar Förster 1871

5 H. smithii Förster 1871

5 H. oculatus Förster 1871

5 H. schenckii Förster 1871

5 H. consobrinus (Schenck 1874)

5 H. strigulosus Costa 1884

5 H. annularis : auctorum, misident., nec H. annularis ( Kirby 1802) 5 H. elbursa (Warncke 1981)