SUPPLEMENT. 339 



with a white reflection, that of the female dark-gray, covered with 

 whitish dust only at the top and on the lateral margin. Cilia of 

 the inferior orbit black. Upper side of the thorax somewhat 

 covered with brown dust, more shining towards the posterior 

 margin ; the impression on the lateral end of the transverse suture 

 with a white reflection. Scutellum steel-blue. Lamellae of the 

 hypopygium short, crescent-shaped, black, and covered with black 

 hair. All the coxa? blackish. Feet yellow, or brownish-yellow ; 

 the tip of the hind femora black ; the fore femora are often infus- 

 cated to a considerable extent towards the basis ; the middle 

 femora also sometimes show, towards the basis, a distinct infusca- 

 tion ; the extreme tip of the middle tibiae, as also the basis and 

 the tip of the hind tibiae are usually also somewhat infuscated. 

 Fore tarsi, towards the tip, strongly infuscated ; middle and hind 

 tarsi, with the exception of the basis, black-brown. Tegulse 

 yellowish with black cilia. Wings tinged with blackish-gray ; 

 the space between the third and fourth longitudinal veins rather 

 narrow. 



Nub. New Rochelle, N. Y., in June. (Osten-Sacken.) 



8. P. alternans LOEW. 9 . Obscure viridis, vittis thoracis alter- 

 nantibus seneo-cupreis et ex c;eruleo viridibus, seta antennarum brevis- 

 sime subplutnata, ciliis oculorum inferioribns albidis, coxis anticis 

 pedibusque flavis. 



Dark green ; the thorax alternately with dark copper-red and blue-green 

 longitudinal stripes ; arista feathered with very short hairs ; cilia of the 

 inferior orbit whitish; fore coxse and feet yellow. 



Long. corp. 0.13. Long. al. 0.13. 



SYN. Pelastoneurus alternans LOETV, Berl. Ent. Zeitschr. VIII, 95, 91. 



Dark bronze-green ; thorax with alternately blue-green and dark 

 copper-colored longitudinal stripes. Front steel-blue. Antennae 

 red, most of the third joint black-brown ; the arista feathered 

 with very short hairs. Face narrower than in the females of 

 other species, dark gray. Cilia of the inferior orbit whitish. 

 Scutellum blue-green, almost steel-blue. The impression on the 

 latei'al margin of the thorax has a bright white reflection. The 

 whole fore coxse and the feet yellow ; hind femora scarcely some- 

 what blackened at the extreme tip ; the tarsi from the tip of the 

 first joint black. Tegnla? white-yellowish, with black cilia. 

 Wings tinged with blackish-gray. 



Hab. New Roohelle, X. Y. (Osten-Sacken.) 



