Very interesting topic! X. arcuatus was described as Amauresthes from two specimens coming from Hong-Kong. Here is the original description... I do not exactly recognise none of that specimens.
I read the description... The main difference between pictures 1 and 3 is the space between second and third lignes. But one detail tell me that Horshehden specimen is closer from X. incurvatus : "la deuxième ligne se terminant à la hauteur de son début". It's not working for my specimen. Can you separate the second picture and create a new post ? It's really another species.
The former one is probably X. contortus Gahan, 1906, while the latter one is X. incurvatus. Both species may be seen in this paper (p. 193, fig. 18-19).
According to Gressitt (1951: p. 244-245), the former species is subspecies of the latter one, but this is another delirium of this entomologist. In fact, both "subspecies" are present in Manipur (Gahan, 1906: 249), Taiwan (Matshushita, 1933: 269-270), Assam and South China (Gressitt, 1951!).
What a job Francesco ! Thank you very much ! Thanks a lot to horshehden for his picture. I have seen that something didn't work..., but now it seems clear. I've got 6 or 7 specimens of Xylotrechus contortus, and it's a stable species on this series. I've got probably 50 species of Clytini with no name coming from Laos, and this post gives me some courage.
I have one similar to this collected from Guizhou province which is a province next to southern Sichuan of China. I guess it probably is a var or a subspecies of X. incurvatus.
Welcome Nalslan I agree with you ; it seems to be the same species.
Xavier, thank you very much. I found this website and its forum and the users are very friendly and helpful, especially to me, a beginner to cerambycid id (I usually did not do this myself). I hope I won't abuse it, though I might more or less do it.
Posted - 11/07/2012 : 12:58:48
