２−３−４　Chironomini　others 　　 (with another chracteristic)
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Fisshimentum sp.1 , 　　Fissimentum sp.2 (Stelechomyia 　?,)　　

Ｆｉｓｓｈｉｍｅｎｔｕｍ

Larvae １２〜１３mm long. Color reddish orange. Head brown. With 2 pairs eye spots separate. These larvae inhabit in sandy bottom about 1m depth slow flow or
standing water. I caught them in Lake Biwa, Motosu and Inawasiro and River Kiso in Japan.

Mentum with 8 lateral teeth arranged deep V shape , median tooth absent .	The length of ventromental plate sligthly curved , more than twice of metum. the width more than seven times of heigth.	Post occipital margin wide .
Ｓ�Tplumose ,Ｓ�U thick, Ｓ�V thin and long. Labral lamella with 10 or more teeth.	Premandible palmate with four teeth ; . hair of the base absent .	Antenna with 6 segments , 2/9 of the head.; Antenna ratio 0.8.: Ring organ of the basal segment absent. Small Lauterborn's organ at the tip of the 2nd and 3rd segment., Blade far exceeds the point of the antenna .
Apical tooth large , bend almost squarely , and affix one large and two small inner teeth to the base. Seta subdentalis long , bends along apical tooth .

Fissimentum sp. 2 (Stelechomyia　？)

Larvae 4〜4.5mm long. Color pale orange.Head rectangle, pale brown, ventral side dark brown , with 1 pair eye spot.
I caught only one larva in River Nabari Mie pref., sandy bottom, nomal current.

. Fissimentum sp.2
Median tooth very small, between both lateral teeth arranged deeply convex. Lateral teeth with eight, redish brown. Ventromental plate fun shaped, inner side sharp and outside round, weakly striated.	Apical tooth long, 1/3 of mandible. Three inner teeth small. Seta subdentalis very long.	Antenna 6 segment. antenna ratio 0.9〜1.0. Small Lauterborn's organ and short projection on top of the 3rd segment.
Ｓ�Tpalm shape with 5 fingers . Ｓ�Usimple ,thin. Pecten epipharyngis long 3 lobes. Premandible with several teeth.	Anterior parapod diverged to two in the point. Tip of claws with 2〜3 coarse serrated teeth .	Anal tubules short, Posterior parapod with 16 brown claws
	Fissimentum sp.2 (Ｓｔｅｌｅｃｈｏｍｙｉａ) １：antenna ２：mentum ３：mandible ４：head (ventral side) ５：labrum ６：maxilla ７：anal tubules ８：claws of anterior parapod ９：Claws of postrior parapod

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