Smithsonian Miscellaneous Collections
Smithsonian Miscellaneous Collections
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Wings smoky- blackish, towards the anterior margin darker ; they become visi- bly broader towards the basis ; posterior transverse vein but little before the middle of the wing ; the first longitudinal vein reaches almost as far as the middle of the anterior margin and is some- what distant from the latter.
Hah. New York. (Osten-Sacken.) Observation 1. — D. opacus is very closely allied to the Euro- pean D. nigricans. As I have only one specimen of the former, I am unable to i)rove the coincide...nce of both species in all the DIAPHORUS. 161 pl&stic characters as fully as it is necessary when an American species is to be recognized as identical with a European species.
Neither can I mention any reliable characters for the distinction of both species. I believe that the examination of a larger num- ber of specimens will establish their identity.
Observation 2. — I believe I know the female of D, opacus, am however not certain, on account of the smaller length of the first longitudinal vein and the paler coloring of the hind tibiae.
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To quickly assess the difficulty of the text, read a short excerpt:
Wings smoky- blackish, towards the anterior margin darker ; they become visi- bly broader towards the basis ; posterior transverse vein but little before the middle of the wing ; the first longitudinal vein reaches almost as far as the middle of the anterior margin and is some- what distant from the latter.
Hah. New York. (Osten-Sacken.) Observation 1. — D. opacus is very closely allied to the Euro- pean D. nigricans. As I have only one specimen of the former, I am unable to i)rove the coincide...nce of both species in all the DIAPHORUS. 161 pl&stic characters as fully as it is necessary when an American species is to be recognized as identical with a European species.
Neither can I mention any reliable characters for the distinction of both species. I believe that the examination of a larger num- ber of specimens will establish their identity.
Observation 2. — I believe I know the female of D, opacus, am however not certain, on account of the smaller length of the first longitudinal vein and the paler coloring of the hind tibiae.
What to read after Smithsonian Miscellaneous Collections?
You can find similar books in the "Read Also" column, or choose other free books by Smithsonian Institution to read onlineMoreLess
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