Chironomus species NI 2

C. species NI 2

Adult
Known only from an adult male with associated pupal exuvia

C. species NI 2: Male hypopygium (left) and superior volsella (right)

Male:

Wing length - 3.44 mm, wing width - 0.82 mm, VR - 1.06; AR not known, LR - 1.74.
Frontal tubercles present, length about 15 µm. Setae on clypeus Ð 25. Palpal segments 2-5 (micron): 58 : - : 278 : 452; P5/P4 1.63.
Thoracic setae: Acrostichals - at least 12; Dorsolaterals - 7 & 9, Prealars - 4; Scutellar in two rows, anterior - 4, posterior - 12 (total 16).
Legs: Fore tarsi without a beard. Segment lengths (micron) and proportions :

Male	Fe	Ti	Ta1	Ta2	Ta3	Ta4	Ta5	LR	F/T	BR
PI	1580	1240	2160	-	-	-	-	1.74	1.27	2.5
PII	1580	-	-	-	-	-	-	-	-	-
PIII	1760	1760	-	-	-	-	-	-	1.00	-

Hypopygium with anal point narrow at base, 17 setae in separate pale areas on TIX. Superior volsella essentially of the D-type of Strenzke (1959), closest to his figure f, but with end squared off.

Pupa: The caudolateral spur of segment 8 has 1-3 spines, but appears to have a broadened base. No other information available.

C. species NI 2: Note the broadened base of the spur.

No larva definitely associated with this adult is known.

Found: Norfolk Island - Bridle Track (72-824).

This reared male is in the Australian National Insect Collection.

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