Revision of Ommatius Wiedemann (Diptera: Asilidae). IV. Pygommatius subgen. nov. with twenty-five Afrotropical species
Author
Scarbrough, Aubrey G.
Department of Biological Sciences, Towson University, Baltimore, MD 21252, USA;
Author
Marascia, Claudio G.
text
Zootaxa
2003
2003-07-04
228
1
1
94
http://biotaxa.org/Zootaxa/article/view/zootaxa.228.1.1
journal article
5623
10.11646/zootaxa.228.1.1
081ba61b-c79c-401c-a265-060a46979cd2
11755334
5019043
AC9F77DE-F702-4620-B756-D753E77FBC73
Ommatius (Pygommatius) digitattus
Oldroyd
Figs. 8
,
118125
Ommatius digittatus
Oldroyd, 1970
, 24: 321.
Ommatius digittatus:
Oldroyd, 1980: 347
(Afrotropical catalogue).
Redescription, male. As
O. bingeri
except as follows. Black. Length, body 8.99.0 mm; wing 5.0
5.1 mm
.
Head
: FHWR 1.0:4.31.0:4.8. Frons with setae about as long as scape and pedicel combined. Pedicel ventrally with 1 long black seta; style with unusually long setae, length about as long as style. Ocellar tubercle with 2 contrastingly long setae, several thinner, shorter setae present. Occiput with 34 brown postocular bristles, longest with apex above ocellar tubercle.
Thorax
: Mesonotum with anterior setae as long as 3 antennal segments combined; dorsolateral slopes with sparse, short setae. Scutellum with 2 marginal bristles only slightly thicker than setae.
Wing
: As in
O. bingeri
(see
Fig. 8
).
Leg
: Tibiae and femora with abundant thin, yellow setae, slightly longer than usual, producing a thin fuzzy or woolly appearance. Hind femur anteriorly with 2 rather long bristles, apical half with ventral bristles short and thick, those basally much thinner and shorter; HFWLR 1.0:6.51.0:6.7.
Terminalia
(
Figs. 118122
): Epandrium 3 branched; dorsal branch short, flat dorsally, shorter than cercus; dorsal and ventral branches parallel, flat laterally, much longer than wide. Gonostylus slender, long, curved basally, crossing posteriorly. Hypandrium apically with a flat ‘beard’ of thin bristles.
Female. Differs from male as follows. Length, body
9.1 mm
; wing
5.8 mm
.
Head
: Face with 4 brown bristles, vestiture otherwise yellow; FHWR 1.0:4.4.
Leg
: Hind femur basally with only 4 very long, thin posteroventral setae; HFWLR 1.0:5.0. Tibial setae sparse. Middle tarsus with only 4 yellow bristles; hind tarsus with only brown bristles.
Abdomen
: Brown tomentose dorsally, slightly yellow, mostly brown setose; sternites 35 with only thin setae. Apical corner of tergite 7 with 13 bristly setae or bristles. Sternite 7 apically with 4 thick and long bristles. Tergite 9 short, onethird as long dorsomedially as laterally.
Terminalia
(
Figs. 123125
): Three tubular spermathecae present; duct prebasal and lateral. Apical margin of sternite 8 moderately produced, notched on each side before middle.
SPECIMENS EXAMINED.
DEMOCRATIC REPUBLIC OF CONGO
:
Holotype
♂
,
Congo Belge P. N. G.
/
Miss H. de Saeger
/
Mabanger
29.ix.1952
/
H. De Saeger
, 4103 (
MARC
);
1 ♂
,
paratype
, same data as holotype except
Ndelele
/4 18.vi.52 / 3678 (
MARC
);
1 ♀
paratype
, same data as
holotype
except I/o/7
11.ix.1950
/
Rec. G. Demoulin
812 (
MARC
);
2 ♂
paratypes
, same data as
holotype
except I/o/2
3.x.1950
/ # 866 (
MARC
);
1 ♀
paratype
, same data as
holotype
, II/gd/4
5.vii.1952
/ 3743 (
MARC
);
1 ♂
paratype
, as
holotype
except “Pali”/8
27.ix.1952
/ 4101 (
MARC
);
1 ♀
paratype
, II/gc/6
27.ix.1951
/ # 2479 (
MARC
);
1 ♀
paratype
, ii/FD/18 8.x1.1951 / # 2554 (
MARC
);
1 ♂
,
1 ♀
paratype
,
Congo Belge
PNG /
Miss H. De Saeger
/
Pali
/8 /
27.xi.1952
/
H. De Saeger
4101 (
BMNH
).
1 ♂
,
12 mi
N of Uvina
/
920 m
/
5.i.1958
/
E. S. Ross
and
R
.
E. Leech
(
CASC
).
KENYA
:
1 ♂
,
Chyulu Range
/
13001800 m
/
2.v.1991
/
A. Freidberg
and
Fini Kapplan
(
NMSA
).
Distribution. Captured from 920 to 1800 meters in elevation from September to July in the
Democratic Republic of Congo
and
Kenya
.
Remarks.
Ommatius digittatus
differs from other congeners primarily in the combined characters of the terminalia (
Figs. 118125
).
The
holotype
is in excellent condition. The
eight paratypes
in
MARC
range from good to poor condition with broken or missing parts, e. g. # 812 with left hind leg missing; #
866 female
teneral with the right wing ‘crumpled’, and right fore tarsus and left fore and left middle tarsi missing; # 3743 left flagellum/style, entire abdomen, right wing, and right hind tarsus missing; #
866 male
with abdomen glued to thorax and right leg missing; # 4101 with abdomen glued and right hind tarsus, left flagellum/style missing; # 2479 with abdomen beyond segment 3 and apex of wing absent; # 2554 with flagellum/style, both hind legs and right middle tarsi absent, and right wing torn posteriorly; # 3678 with abdomen absent beyond segment 4.
Paratype
# 3197 is an unknown species, not
O. digittatus
.
The
two paratypes
in
BMNH
are in good condition
.