Hylaeus (Deranchylaeus) krebsianus
Creators: name: Dathe, Holger H.
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Colletidae
Hylaeus
Hylaeus krebsianus

description: Hylaeus (Deranchylaeus) krebsianus (Strand, 1912)
Figures 30, 33, 92–95
Prosopis krebsiana Strand, 1912: 33. 1 ♀, South Africa: Kapland. Typus ♀ MNHU Berlin.
Hylaeus (Deranchylaeus) krebsianus (Strand): Bridwell 1919: 144; Snelling 1985: 8.
Hylaeus krebsianus (Strand): Cockerell 1932e: 171; Cockerell 1942: 2; Eardley & Urban 2010: 31.
Prosopis immarginata Alfken, 1914: 187. 1 ♀, S-Afrika [South Africa]: Capland, Algoa Bay. Typus ♀ MNHU Berlin.— Syn. n.
Hylaeus (Deranchylaeus) immarginatus (Alfken): Bridwell 1919: 137–138, ♂ new: 144; Snelling 1985: 8.
Hylaeus immarginatus (Alfken): Cockerell 1932e: 171; Cockerell 1936e: 3; Cockerell 1942: 2, 4, 13–14.
Hylaeus abjunctus Cockerell, 1936e: 1–2, 9. ♂. South Africa: Cape Province, Cape Town. Typus ♂ AMNH New York ac. 34242.— Cockerell 1942: 2, 15; Eardley & Urban 2010: 26.— Syn. n.
Hylaeus (Deranchylaeus) abjunctus Cockerell: Snelling 1985: 8.
Diagnosis
This is one of the larger species with strong punctation. The propodeum is rounded and the terminal area is punctate. The male mask is abbreviated above, particularly the side spots. Supraclypeal area is almost entirely black; the scapi are expanded above and clavate; the gonoforcipes are obliquely truncated. The female has long, white stripes adjacent to the orbits.
Characteristic features
Male. TL 4.9–6.0 (5.49) mm, WL 3.5–4.2 (3.80) mm.
Head. Proportions HL:HW 0.97, UFW:LFW 1.71; outline trapezoid, face strongly converging downwards. Scapi black, elongate, apically with bulb-like extension that is smooth and shiny, SL:SW 1.8; mask white, paraocular marks only expanded up to upper clypeus margin, from there tapering to orbits. Supraclypeal area only below with narrow white mark. Clypeus CL:CW 1.63, slightly shining, disperse punctate.
Mesosoma compact, white pilosity sparse, short, spreading. Pronotum, calli and tegulae entirely black. Pronotum narrow expanded forward, anterior margin rounded, lateral edges rounded. Mesonotum and scutellum shiny, shagreen, punctation strong, dense. Legs black, foretibiae bright in front, basitarsi bright; wings darkened, venation brown. Propodeum rounded, without carinae; medial area with reticular wrinkles, terminal area with moderate, dense to subcontiguous punctation.
Metasoma compact, black. T1 and T2 with strong dense punctation, following terga with finer punctation; T1 with white lateral fringes. Terminalia (Fig. 30): genital capsule with gonoforcipes obliquely truncate, apically acute, penis valves midst open; S8 with base prolongate, tip short, S7 proximal lobi with ca. 10 long flattened comb bristles.
Female. TL 5.4–6.8 (6.09) mm, WL 4.0–4.5 (4.23) mm.
Head. Proportions HL:HW 0.98, UFW:LFW 1.57. Face with long white stripes at orbits, clypeus sometimes with white spot. Clypeus CL:CW 1.35.
Mesosoma. Pilosity as in male, margins of pronotum and calli white tomentose; coloration entirely black, bright spots only on tegulae. Pronotum narrow, midst edged, laterally rounded, lateral edges blunt. Mesonotum, scutellum and mesopleurae with strong, dense punctation. Legs entirely black, spurs and bristles of tibiae and tarsi are bright. Propodeum (Fig. 33) rounded and punctate like in male.
Metasoma compact, black. T1 with strong, subcontiguous punctation, T2 apically punctation very finely dispersed, following terga shagreen, punctation in sculpture hardly recognizable; T1 with white lateral fringes.
Distribution
South Africa.
Specimens examined: 18 ♂, 26 ♀ coll. MNHU, NHML, OLBL, SAMC, SANC, TMSA.
SOUTH AFRICA. Eastern Cape: Algoa Bay.— Northern Cape: Groenriviersmond, coast; Helderberg College; Kongo Mtn Resort, 33.31S 22.21E; Nieuwoudtville 10 km N, Farm Grasberg, dolerite hill, 31.18.01S 19.0542E, 800 m; Ouberg Pass, Fynbos, 27 km SE Vanrhynsdorp, 31.48.07S 18.55.00E, 380 m. — Western Cape: Barrydale; Bredasdorp 25 km S, coast; Cape Town; Du Toits Kloof, summit; Fishhook; George; Greyton, Riviersonderend; Klein Karoo SE Groot riv.; Stanford, 34.28610S 19.27256E; Stellenbosch, Jonkershoek; Strandfontein, 31.4511S 18.1337E, 42 m; Tradouw Pass, Swellendam Distr.; Villiersdorp, 33.58S 19.16E; Waboomskraal, 33.52S 22.22E; Witkrans Farm nr Gansbaai, 34.33253S 19.27376E; Ysterfontein; Zachariashoek, 33.8238S 19.0445E, 300 m.
Flower visit
On flowers of Leucospermum sp., Zygophyllum sp. (Gibson, label record); Phylica pubescens (Giliomee, label record); Schinus terebinthifolius (Toubert, label record).
description: Published as part of Dathe, Holger H., 2014, Studies on the systematics and taxonomy of the genus Hylaeus F. (8) Revision of the Afrotropic subgenus Hylaeus (Deranchylaeus) Bridwell (Hymenoptera: Anthophila, Colletidae), pp. 1-84 in Zootaxa 3874 (1) on pages 47-49, DOI: 10.11646/zootaxa.3874.1.1, http://zenodo.org/record/4948240