SUPPLEMENT. 323 



species, which, according to Baron Osten Sacken's statement, is 

 not uncommon in the lower parts of New York City, should have 

 been accidentally imported in ships from the south of Europe. 

 As species common to both continents may perhaps be also re- 

 garded Diaphorus nigricans Meig. and Xanlhochlorus tenellus 

 AVied. ; the Xorth American Diaphorus opacus . might be con- 

 sidered as identical with the first, Xanthochlorus helvinus with 

 the second of these species; certainty about this point, however, 

 can only be acquired by the close comparison of a larger number 

 of well-preserved specimens of the two American species. 



II. Description of some Species communicated of ter the Volume 

 had gone through the Press. 



Gen. II. DOLICHOPUS. 



Corrected Table for determining the Species. 



, f Prevailing color of the feet black. 2 



I Prevailing color of the feet yellow. 9 



9 f Cilia of the inferior orbit black. 3 



I Cilia of the inferior orbit whitish. 4 



o f Face ochre-yellow. 1 gratus Lw. 



\ Face silvery white. 2 laticornis Lw. 



j First joint of the hind tarsi with numerous bristles. 3 setifer Lw. 



iFb 



First joint of the hind tarsi with a few bristles. 5 



f Hind tibiae black only at the tip. 6 



\ Hind tibiae entirely black. 7 



The black color at the tip of the hind tibise is rather extended and 

 not very sharply limited. 4 albiciliatus Lw. 



1 "* The black color at the tip of the hind tibiae but little extended and 



I 



sharply limited. 5 xanthocnemus n. sp. 



•7 f A considerable extent of the tip of the femora yellow. 6 tetricus n. sp. 



t The extreme tip of the femora only somewhat yellowish. 8 



R f Lamellae of the hypopygium pointed. 7 acuminatus Lw. 



Lamellae of the hypopygium rounded ovate. 8 ovatus Lw. 



q f Cilia of the inferior orbit black. 10 



\ Cilia of the inferior orbit pale. 12 



, f Fore coxae blackish. 9 pachycnemus Lw. 



* Fore coxae yellow. 1 1 



,, f The first two joints of the antennae yellow. 43 dorycerus Lw. 



I The whole antennae black. 10 brevipennis Meig. 



, o f Tegulse with pale cilia. 13 



X Tegulae with black cilia. 26 



