Holarctic Chironomus (s.l.) - Benthalia carbonaria type

Benthalia carbonaria group species from Kyushu:

Based on a single incomplete adult male

This may be a specimen of species 1, based on the small almost globular frontal tubercles.
Color: Thorax dark brown, abdominal segments largely darkened (brown?), legs apparently yellowish.
Wing length 2.28 mm, width 0.58 mm; VR about 1.09; 11 setae in squamal fringe, 2-3 SCf on brachiolum.
Head: Antennae missing; frontal tubercles almost globular 30 x 24 µm; clyeus width about 0.77 the diameter of the antennal pedicel; palpal proportions (µm) 43 : 43 : 164 : 177 : missing.
18 clypeal setae.
Thoracic setae - acrostichal - none obvious; dorsocentrals 12-14 in a single row; prealars 5-6; supraalar 1; scutellar with setae in 2 rows, anterior row 6, posterior row 13.
Legs: Lengths and proportions (micron):

	Fe	Ti	Ta1	Ta2	Ta3	Ta4	Ta5	LR	F/T
PI	860	900	-	-	-	-	-	-	0.96
PII	910	785	450	245	165	105	85	0.57	1.16
PIII	915	950	710	355	290	180	150	0.75	0.97

Abdominal segments relatively dark with a darker narrow band at the posterior end of segments I-IV; 8 setae in double row on midline of tergite IX.
Superior volsella on relatively long basal section and with long curving distal part; setae of Inferior volsella simple, gonostylus moderately swollen and reducing gently.

Male hypopygium (left), SVo (center) and setae of TIX (right).

Found: - Japan: Shimobaru (33.60°N, 130.42°E), Fukuokashi Higashi Ku, Fukuoka Prefecture, Kyushu.

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