Batley & Houston: Australian bee genus Trichocolletes 
27 
Tamala turnoff, 28 Aug. 1997, T. F. Houston & P. Mathiasen, on flowers 
of Malleostemon roseus, WAM (13680); 4(5', $, East Yuna Reserve, 34 
km WNW Mullewa, 16-29 Aug. 1984, T. F. Houston & B. P. Hanich, on 
flowers of Thryptomene hyporhytis, WAM (13673-77); 3$, 10 mi E of 
Meekatharra, 31 Aug. 1971, T. F. Houston, SAM (32-024663-65); 2?, 8 
km N Nerren Nerren HS, 25 Aug. 1985, R. P. McMillan, on Prostanthera 
wilkeana, WAM (13678-79); 3(3, 9$, 13 km S Wanoo, 24-28 Aug. 1984, 
T. F. Houston & B. P. Hanich, on flowers of Baeckea & burrowing into 
walls of freshly dug pit in sand, WAM (13661-70,72). 
Diagnosis 
Eyes not hairy; metasomal bands wide, gold; malar space very 
long. Male S3 with distinctive hair plume. Female scutum 
with transverse band of dark hair. Unlike any other species. 
Descriptions 
Male (WAM 21597 ).—Head width 4.35 mm, body length 
12.0 mm. Relative dimensions: HW 50, HL 39, UID 36, 
UFW 35, FID 32, DMA 22, HVO 5, WOC 15, MOD 4, 
OOD 10, IAD 10, ASD 3, AOD 8, MF 20, BMW 6, MSF 
7.5, SF 13, SW 3, FF c. 59 .—Eyes not hairy, much shortened 
leaving malar area almost twice as long as wide (Fig. 17); 
flagellum longer than head width; all flagellomeres c. 1.5x 
as long as wide. Fegs slender; hind tarsus 1.3x as long as 
hind tibia; hind basitarsus 5.4x as long as wide; posterior 
carina of basitibial area extends past apex. Gonoforceps 
transversely truncate with long apical hairs (Fig. 35); lateral 
lobes of S7 fused with posterior projections and basal teeth 
(Fig. 65).— Mandible , scape, tarsi, fore and hind tibiae, 
anterior faces of mid tibia and all femora, flagellomeres 
F2-8 ventrally, orange-brown; remainder of flagellum brown. 
Tl-5 with wide, deep gold bands; T7, S6 laterally, orange- 
brown .—Scutum with dull sheen and moderately strong 
pit-reticulation. Scutum closely and face densely covered 
with bright orange hair, erect on clypeus, fore basitarsus with 
brush of relatively short golden hair; S3 with dense medial 
plume of long white hair (Fig. 18). 
Female (WAM 13661 ).—Head width 4.85 mm, body length 
13.6 mm. Relative dimensions: HW 50, HF 37, UID 31, 
UFW 34, FID 32, DMA 27, HVO 4, WOC 14, MOD 3, 
OOD 9, IAD 8, ASD 3, AOD 10, MF 19, BMW 8, MSF 
5.0, SF 13, SW 3, FF c. 36 .—Eyes not hairy; face quadrate; 
length malar space c. 0.7x basal mandibular width (Fig. 16); 
clypeus uniformly convex transversely; middle flagellomeres 
c. 1.5x as long as wide; inner hind tibial spur with c. 5 well¬ 
spaced teeth; tarsal claws with sharp inner ramus about 
half length of outer; pygidial plate broad with truncate, 
upturned margin .—Mandible medially orange-brown; legs 
dark brown. Tl-4 with wide, bright gold bands .—Clypeus 
polished with open to close large punctures; scutum polished 
with close punctures .—Lower face with long, plumose, 
white hair, dense in paraocular areas, sparse to open on 
clypeus and supraclypeal area; frons densely covered with 
plumose, orange-brown hair, darker towards ocelli. Scutum 
covered with close to dense, plumose hair, anterior 20% and 
thin line around lateral and posterior margins pale orange- 
brown, remainder dark brown; semi-erect hair on terga 
strongly reflective giving metasoma a golden sheen, more 
pronounced apically. 
Remarks. This species is referred to as F247/M220 in 
Houston (2000). 
Etymology. The specific name, used as a noun in apposition, 
is derived from the Greek words for large and jaw, referring 
to the greatly elongated malar space of this species. 
Distribution. Area around Geraldton, Western Australia 
(CAR, GS, MUR, YAF) (Fig. 103). 
Trichocolletes marginatus (Smith) 
Figs 19, 36, 66, 104 
Paracolletes marginatus Smith, 1879, p. 4. 
Trichocolletes (Trichocolletes) marginatus Michener, 1965, 
p. 80. 
Specimens examined. The lectotype <3, Australia, BMNH (Hym 17.a.417) 
and the following. Western Australia: <3, Albany, 9 Nov. 1981, B. L. 
Dickenson, WAM (13904); $, Albany, L. J. Newman, WAA (80829); 2$, 
Albany, 18 Nov. 1991, H. T. Mattner, WAM (13900-01); 8(3, Calgardup, 
WAM (13747-54); % Cape Freycinet, 15-18 Nov. 1986, T. F. Houston, 
WAM (13903); 2(3, Denmark, WAA (45282-83); 12(3, Elleker near Albany 
(35.0167°S 115.9500°E), 1 Nov. 1998, A. Ferguson, WAM (21954-65); 
?, Margaret River, 29 Dec. 1970, G. A. Holloway, AM (K.316700); (3, 25 
km NE Nannup (33.8167°S 115.9500°E), 25 Nov. 1989, P. Jones, WAM 
Figs 16-18. Trichocolletes macrognathus n.sp.: head showing long malar area of (16) female, (17) male; (18) ventral view of male 
metasoma, showing plume on S3. 
