Pachyanthidium (Pachyanthidium) bouyssoui Vachal
Creators: name: Eardley, Connal
name: Griswold, Terry
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Megachilidae
Pachyanthidium
Pachyanthidium bouyssoui

description: Pachyanthidium (Pachyanthidium) bouyssoui (Vachal)
(Figs 18–19)
Anthidium bouyssoui Vachal, 1903a: 373, male and female syntypes (? TMSA) Democratic Republic of the Congo.
Anthidium (Pachyanthidium) bouyssoui Vachal: Friese 1905: 66.
Anthidium bicolor var. bouyssoui Vachal: Strand 1911: 120.
Pachyanthidium bouyssoui (Vachal): Cockerell 1930: 45 –49.
Pachyanthidium (Pachyanthidium) bouyssoui (Vachal): Pasteels 1984: 144.
Pachyanthidium bouyssoui var. tumbense Cockerell, 1935: 237, female holotype (RMCA) Democratic Republic of the Congo; Pasteels 1984: 144, syn.
Diagnosis. This species can be separated from all other species in the genus except other species of the bicolor species-group by the combination of the naked eye, absent arolia, and metasomal terga mostly orange (Fig. 18). From other species of the bicolor species-group females can be distinguished by the combination of the partly spatulate mandible with two outer teeth, 2–3 small teeth on outer spatulate area and a large inner tooth, the forewing with cells as dark as the rest of the wings, face, mandible and femora with yellow maculations, mesepisternum all dark or with a little yellow maculation. Males can be distinguished by having 4–5 similar, pointed, evenly spaced mandibular teeth and T7 with the median spine longer and broader than the narrow lateral spines; its width half that of the concavity between it and the lateral spines, and its apex broadly rounded.
Description. FEMALE. Lengths: head 3.4–3.5 mm; scutum 2.2–2.4 mm; forewing 7.7–8.4 mm; body 8. 5–9.0 mm. Head and mesosoma black except yellow maculation as follows: clypeus with W-shaped cross-band of irregular width or marking absent, outer margin of paraocular area, posterior vertex with a very short cross-band, basal portion of mandible, pronotal lobe, mesepisternum narrowly behind omaulus, narrow lateral margins of scutum and axilla, narrow subapical cross-band on scutellum, fore and mid femora and tibiae anteriorly, hind femur on distal half of anterior face, usually entire hind tibia and most of tarsi; metasoma orange except indistinct yellowish-orange cross-bands generally on T1–T5; T6 laterally; translucent posterior margins on scutellum (yellowish) and T1–T5 (orangish); forewing dark with cells as dark as rest of wing. Structure (Fig. 18). Preoccipital ridge weakly lamellate; eye naked; clypeus ventral edge straight, crenulate; mandible partly spatulate, 2 outer teeth, 2–3 small teeth on outer spatulate area, a large inner tooth; pronotal lobe strongly lamellate; omaulus lamellate; forebasitarsus short and broad, length, 0.6x foretibia length, 3.3x its width; arolia absent; T1–T5 without lateral spines; T6 rounded laterally, slightly lobate, without spine, extended posteriorly, distinctly cleft posteromedially.
MALE. Lengths: head 2.8–3.2 mm; scutum 1.8–2.0 mm; forewing 6.3–6.8 mm; body 6.8–7.7 mm. Colour as in female except: clypeus completely to partly yellow (dorsolateral region black), mandible yellow except apically, T7 yellowish-orange. Structure (Fig. 18). preoccipital ridge weakly lamellate; eye naked; clypeus ventral edge straight, 2 mediolateral tubercles; antennal flagellum 0.87x eye, 3.2x scape lengths; mandible with 4–5 similar, pointed, evenly spaced teeth; omaulus lamellate; forebasitarsus sparsely pubescent, with moderately long posterior fringe; forebasitarsus length 0.6x foretibia length, 0.3x its width, not distinctly expanded distally; hind basitarsus wide, length 2.5x width; arolia absent; T1–T4 without lateral spines or swelling; T5 slight posterolateral swelling; T 6 in one plane extended posteromedially, with small ventrolateral spine, posterolateral and posteromedian tubercles, latter slightly emarginate posteromedially; T7 with narrow posterolateral spine (narrower than length), apically rounded median spine, concavity between median and lateral spines 1.5x median spine width; terminalia as in P. cordatum (cf. Fig. 16).
Distribution. This species appears to be widespread across the northern part of the Afrotropical Region (Fig. 19).
Biology. It has been collected on flowers of Phaseolus lunatus (Fabaceae), Stachytarpheta augustifolia (Verbenaceae) and Stylosanthes erecta (Fabaceae) (Eardley and Urban 2010).
Material examined. Type material. Female holotype of Pachyanthidium bouyssoui var. tumbense: ‘ MUSEE DU CONGO Eala –Bokatola–Bikoro IX– X–1930 Dr P. Staner, R. DET. K 2548, Pachyanthidium bouyssoui v tumbense det. Ckll TYPE., TYPE’, RMCA.
Additional material. Ghana. Central Region, Stingless bee research station road, 2008. x.28, J. Giggs (1♀ YU); Central Region, Kakum Conservation area, 2005. i.18 (1♂ SANC); Aburi, 1991. ii.10, W. J. Pulawski (1♂ CAS). Togo. Amaoude, 17km N Sokode, 1991. ii.18, W. J. Pulawski (1♀ CAS). Cameroon. Nanga Eboko, 1959–1960, R. Lenczy (1♀ BBSL). Central African Republic. Nola, 35km N, 2008. xii.12, J. Halada (1♂ MSAA); Kbaika, 55km NWN, 2008. xii.12 (1♂ MSAA); Bangai, 70km NNE, 2010. xi. 4–28, J. Halada (2♀ 1♂ MSAA). Gabon. Malela, 1915. vii.5, Lang Chapin (1♀ 2♂ AMNH, BBSL); Ogooue – Ivindo Dist., Foret des Abeilles, Makande, 1995.x–xi, D. Roubik (1♀ BBSL). Congo P.R. Lesio– Loun Fk 330m, 2008. ix.16–23 (1♂ BBSL). Uganda. Entebbe, 1913. vii.30, C. C. Gowden (1♂ SANC); Bwamba, 1957.ii–iii, R. Carcasson (1♀ SANC); Kampala, 33km W, 1952.v, E. Pinhey (1♀ SANC); Kampala, 1963. ix.9, J. Owen (2♀ BBSL). Tanzania. Mkomazi, near summit of Maji Kunanua, 1995. xii.7, G. N. Stone (1♂ SANC); Mikumi, 7km S, Ruaha River bank, Morogoro region, 2001. vi.19, M.H. Bourbin W.L. Pulawski (1♂ BBSL).
Discussion. The specimens from Tanzania (Morogoro region), Ghana (Stingless bee research station road), Gabon and Cameroon are unusual in that they have a wide pronotal lamella. The syntypes of Anthidium bouyssoui could not be located in the TMSA where they were originally deposited.
description: Published as part of Eardley, Connal & Griswold, Terry, 2017, Taxonomic revision of the Afrotropical species of Pachyanthidium Friese (Hymenoptera: Megachilidae: Anthidiini), pp. 401-453 in Zootaxa 4237 (3) on pages 428-431, DOI: 10.11646/zootaxa.4237.3.1, http://zenodo.org/record/344704