
260
(ZSM). Paratypes: 5MM, same as holotype, except: “etwa
350 m über dem Meeresspiegel, schattig, starkes Gefälle
über Granitblöcken”, 26.i.1963, light trap (ZSM, MZSP,
ZMBN).
Diagnostic characters. See keys.
Description
Male (n = 4-6, except when otherwise stated).
Total length 2.08-2.40 (3) mm. Wing length 1.10-
1.23, 1.16 mm. Total length/wing length 2.08-2.40 (3).
Wing length/length of profemur 1.89-2.05, 1.94.
Head, abdomen and legs pale, thorax pale brown.
Head. Antennae with 13 flagellomeres; ultimate
flagellomere 770-1060, 910 μm long; AR 0.79-1.03,
0.93. Temporals 8 (2). Clypeus with 11-19, 15 setae.
Cibarial pump, tentorium and stipes as in Figure 1;
tentorium 350 (1) μm long, 111 (1) μm wide; stipes
414 (1) μm long. Palp segment lengths (in μm): 20-30,
27; 23-30, 25; 69-123, 100; 95-130, 110; 136-193, 156.
Third palpomer with 2-3 subapical sensilla clavata
9-14, 12 μm long.
Thorax (Fig. 2). Antepronotum without setae;
acrostichals 4-6, 5; dorsocentrals 4-6, 5; prealars 2.
Scutellum with 4-6, 6 setae.
Wing (Fig. 3). VR 1.24-1.45, 1.36. R
2+3
ending
closer to R
4+5
than to R
1
. Brachiolum with 2 setae;
R with 5-8, 6 setae; R
4+5
with 9-17, 13 setae; remain-
ing veins bare.
Legs. Spur of foretibia 74-101, 84 μm long; of
midtibia 101-138, 114 μm; of hind tibia 101-138,
118 μm long. Width at apex of foretibia 83-101,
95 μm; of midtibia 92-111, 97 μm; of hind tibia 92-120,
107 μm. Lengths (in μm) and proportions of legs as
in Table 1.
Hypopygium (Figs 4-5). Anal point 18-28, 22 μm
long, 28-37, 30 μm wide; anal tergum without setae,
tergal bands present. Laterosternite IX with 2-3, 2 se-
tae. Phallapodeme 129-230, 183 μm long. Transverse
sternapodeme 101-175, 131 μm long. Gonocoxite
258-378, 338 μm long. Superior volsella digitiform;
157-175, 161 μm long; 46-55, 50 μm wide at base; 45-
47, 46 μm wide at apex; with 5-10, 7 dorsal and 3-5, 4
ventral setae; with microtrichia in basal half. Inferior
volsella curved, clavate; 193-267, 235 μm long; 27-29,
28 μm wide at base; 37-55, 51 μm wide at apex; with
2 apical, thin setae and 7-8, 7 stout, apically dissected
setae. Median volsella subtriangular with broadly
rounded apex; 74-157, 116 μm long; 74-157, 106 μm
wide at base; 37-46, 39 μm wide at apex; with 2-3, 3
strong setae, longest 37 (2) μm. Gonostylus 368-424,
405 μm long. HR 5.61-8.29, 7.71; HV 5.63-7.02, 5.90.
Pupa (n = 1).
Total length 2.95 mm. Cephalothorax and abdo-
men transparent.
Cephalothorax. Frontal apotome conical (Fig. 6),
frontal seta 32 μm long. Precorneal seta 1 (Fig. 8),
9 μm long. Thoracic horn with at least 6 branches;
stout anterior branch with spinules in distal }
(Fig. 7); basal ring elliptical (Fig. 8). Dorsocentrals
7-14, 11 μm long (Fig. 9); distance between Dc
1
and
Dc
2
5 μm; between Dc
2
and Dc
3
109 μm; between Dc
3
and Dc
4
16 μm. Prealars absent.
Abdomen (Figs 10-11). Tergites I, VII, and VIII
without shagreen; T II-VI with anterior transverse
bands of spinules stronger than posteriorly contigu-
ous shagreen; posterior bands of spinules gradu-
ally narrower from T III to T VI. Conjunctive IV/V
with single patch of spinules. Paratergite V with
few spinules along posterior margin. Pedes spurii
A and pedes spurii B present. Setation: segment
I without L setae; II with 2 L setae; III-V with 3 L
setae, VI-VIII with 4 LS setae. Segment VIII with 4
dark, curved, lateral spines 14-23, 18 μm long; spur
single, 9 μm long. Anal lobe 162 μm long, with 15
taeniate setae. Genital sac overreaching apex of anal
lobe by 76 μm.
Female and larva. Unknown.
Etymology. Named in honor of Dr. Ernst J. Fittkau, who
collected the specimens, and for his great contribution to
the knowledge of Neotropical chironomids.
Distribution. Known only from the type locality,
Rio Marauia in Amazonas State, Brazil.
Tab. 1. Lengths (in μm) and proportions of legs of Beardius fittkaui, spec. nov., male (n = 4-6).
fe ti ta
1
ta
2
ta
3
ta
4
p
1
461-608, 543 359-488, 410 737-902, 790 350-415, 373 295-359, 317 221-276, 242
p
2
461-672, 574 368-516, 442 267-414, 341 138-193, 164 111-138, 123 46-82, 64
p
3
525-727, 622 424-599, 507 286-507, 418 175-240, 229 111-212, 172 74-111, 94
ta
5
LR BV SV BR
p
1
83-92, 90 1.80-1.87, 1.84 1.72-1.77, 1.75 1.21-1.33, 1.27 1.7-3.2, 2.3
p
2
32-37, 36 0.72-0.82, 0.77 3.21-3.73, 3.50 2.87-3.14, 2.99 3.0-6.2, 4.9
p
3
37-46, 42 0.67-0.85, 0.82 2.76-3.12, 2.89 2.56-3.32, 2.74 3.4-6.6, 4.4