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Post by takahe on May 3, 2011 21:12:36 GMT -8
This one is from Marquette Michigan in 1987. Looks like a lepturine. When fresh it was purplich with yellow stripes.
Bradleigh
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Post by thanos on May 3, 2011 22:12:45 GMT -8
Typocerus velutinus female.
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Post by prillbug2 on May 4, 2011 3:54:50 GMT -8
Possibly, but it could also be Typoceerus deceptus. You have to use a key to properly separate them. I might post one later today. They are very similar in their markings and size, and even in the field I can't tell them apart very well.
Jeffrey Prill
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Post by thanos on May 4, 2011 16:08:31 GMT -8
Hm,yes..There is an interesting article about these 2 very similar Typocerus here : beetlesinthebush.wordpress.com/2009/07/17/typocerus-deceptus-in-missouri/They have a few slight morphological differences that can separate them..Specifically,according to the above: 'Typocerus deceptus is slightly more robust than T. velutinus, and whereas the transverse yellow elytral bands of the latter are distinct and well delimited, they are weaker and often interrupted at the middle in T. deceptus, giving the beetle a slightly darker brownish appearance. The lateral margins of the elytra are also more strongly emarginated near the apices, giving the beetle a more distinctly tapered appearance. Finally, while both species possess a distinct band of dense, yellow pubescence along the basal margin of the pronotum, this band is interrupted at the middle in T. deceptus.' - After examining the above on our female Typocerus on the photo here..,I find it more possible to be T.deceptus.. Cause on our specimen,the yellow elytral bands are interrupted at the middle..Also,this female has a quite tapered appearance -if you check the lateral margins of the elytra near the apexes,they are strongly emarginated-. Btw,deceptus is much rarer and less widespread than velutinus.. Hope these are quite helpful. Thanos |
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Post by prillbug2 on May 4, 2011 16:38:03 GMT -8
This is from Linsley and Chemsak, The Cerambycidae of North America, Volume 6, part B, 1976.
9(8) Pronotum with densely pubescent apical band along margin; elytra with lateral margins constricted behind middle; apices broad, females with distinct poriferous areas on antennae (segments 6-11), Length 8-16 mm..................................................velutinus
Pronotum without a densely margined apical band along apical margin; elytra with margins not constricted behind middle; apcies slender; females without distinct poriferous areas on antennal segments (6-11). Length 14-17mm............................................................deceptus
The variation in the bands in both specimens is about the same. I've mistaken velutinus for deceptus in the field, and the same the other way. Both are highly variable, and they tend to mingle together, although deceptus is much rarer, I have found it at sugar water traps that I've hung in trees in pretty good numbers. It's probably a fine example of sister species separation that we're looking at here. There are good photographs in Yanega's book. I would look primarily at the thoracic apical band and the antennal pores on the 6-11 segments to actually confirm the difference, not much difference in genitalia, but that is to be expected in Cerambycidae, anyway. But I tried it, once.
Jeff Prill
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Post by thanos on May 4, 2011 17:11:22 GMT -8
Thank you Jeff for this info. So,here is needed also stereoscopic examination of the antennal pores..
Thanos
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