this is a Sawfly (Tanyphatnidea sp.) | 三節葉蜂.
Sawfly is not a easy model so far , and not much chance for me to get close to this insect. But I was surprise while hundred of them on a single tree while my trip @ Massachusetts, US.
there are not really move a lot especially before 7am (and day get bright ~5am) ... so this is a very easy model for macro ...
I missed out the mating picture, even I saw it on the 1st day but it was without my camera ...
and it is easy to shoot >3:1
some additional info from http://gaga.jes.mlc.edu.tw
(三節葉蜂科)體長11mm，觸角黑色3節，末節最長，端部棍棒狀，頭部黑色，前胸背板橙黃色，翅膀藍黑色，前胸腹面藍黑色，腹面橙黃色，各腳背面藍色具褐色分布，內側褐色。外觀近似中華尖鞘三節葉蜂 Tanyphatnidea sinensis 但本種各腳黑色，分布於低海拔山區，常見於葉面活動，雌蟲產卵管器扁鋸狀，能像鋸子般鋸開葉片組織後產卵於內，又稱鋸蜂，幼蟲食植性，外觀像蛾類但腹足不具鉤盤，腹足多達6-8對。
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