Thursday, 24 October 2013

Tidying up the last bits of Xuan Son

Just before the weekend starts with new adventures time to tidy up the remainder of records from Xuan Son. I will start with another new species for me, Vestalaria miao. And to be honest, I cannot be a 100% sure of the ID. Noguchiphaea yoshikoae occurs also in the area, but has characteristic horns on the prothorax, not present in Vestelaria. And Vestalaria miao was recorded right there in Xuan Son, but who knows, maybe another species is present too. So the search for more evidence continues. Here she is:
Vestalaria miao, female, with slightly tinted wings

The same female in hand, note the absence of horns on the posterior lobe of the prothorax

For comparison female Noguchiphaea yoshikoae of Tam Dao in September, very similar although wings slightly different in shape and clear, eyes of different color

Note the horns on the posterior lobe of the prothorax
The second species to publish here is Cratilla lineata, of which I encountered a female in the rain. Cool as addition to the earlier male. She is very similar in markings, but of course with a differently shaped abdomen.

Cratilla lineata, female
What else was worth to mention? How about a teneral male Pseudagrion pruinosum? Here he is, as a possible stumbling block for the unwary.

Pseudagrion pruinosum, immature male. The appendages are a give-away. The neck looks rather bull-like, due to a rain drop that has lodged itself there.

Close-up of the neck and the rain drop. Soon after it would remove it by brushing.
The last to enter for today was an array of Calopteryds. The first is Calopteryx coomani, a species I have seen regualrly at Tam Dao National Park and that also frequents Xuan Son. Especially the female is superficially similar to the female of Matrona basilaris, but that species has, just like the male, a milky shine to the bases of the wings due to the fine maze of veins there, absent in C. coomani. Both are large species, but C. coomani is even more robust.

Atrocalopteryx coomani, male, with blueish shine to abdomen and visibly here translucent areas in the wings.

Male showing the largely translucent front wings and bases to the hind wings.

Atrocalopteryx coomani, female
Matrona basilaris was already introduced in an another entry, but not the female. Compare here to the female of Atrocalopteryx coomani, to which it is rather similar when perched and the milky bases to the wings are not visible. The color of the wings is more greenish and the wings are more slender.
Matrona basilaris, female. I saved this one from the water, where it had become entangled in cobwebs when ovipositing. It did not linger when I released it and perched far away, which explains the grainy picture.

Matrona basilaris, male, for completeness sake
And finally, because it is such a special species, another Matrona taoi male. I find this species much more like A. coomani than like M. basilaris, when it comes to size and shape of the wings.

Matrona taoi, male

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