GYMNOPTERNUS. 93 



blackish. The hairs on the feet are scarcely so rough as usual, 

 and the row of bristles on the upper side of the fore tibiae consists 

 of rather short bristles. Tarsi but slightly infuscated towards 

 their tip. Cilia of the tegulae black. Wings with a blackish-gray 

 tinge. Third and fourth longitudinal veins, towards the end, 

 parallel. 



Hob. Middle States. (Osten-Sackcn.) 



Observation. — The striking resemblance of this species to G. 

 Isevigatus has already been noticed above. If the small bristles 

 on the upper side of the fore tibiae were not visibly shorter in this 

 species, I would suppose it to be only a variety of G. Isevigatus 

 with much paler tarsi. 



IS. CS-. opaciis Loew. % . — Viridis, modice nitens, facie et fronte 

 pollhie ex albo-cinereo vestitis. antennis majusculis, fusco-nigris, arti- 

 culo secundo et articuli tertii basi rufis ; pedibus cum coxis flavis ; coxis 

 intermediis, posticarumque basi nigricantibus ; alis ex flavo dilutissime 

 cinerascentibus, lamellis hypopygii parvis, pallide flavescentibus. 



Green, only moderately shining ; face and front with a whitish-gray dust ; 

 antenna? rather large, brownish-black ; second joint and root of the 

 third red ; coxa? and feet yellow, middle coxae and the base of the hind 

 coxa? blackish ; wings altogether pale yellowish-gray ; the small lamellae 

 of the hypopygium pale yellowish. Long. corp. 0.12 — 0.13. Long. al. 

 0:13. - 



Syn. Gymnoptemus opacus Loew, rTeue Beitr. VIII, 34, 17. 



Green, only moderately shining ; the dust upon the face seems 

 to be whitish-gray, but in an oblique light it has a more pure 

 white appearance. Antennae brownish-black ; second joint and 

 root of the third red; third joint of a considerable size, rather 

 broad, forming a sharp angle at the tip, beset with not very long 

 but very distinct hairs. Arista with a rather short but very dis- 

 tinct pubescence. Front with a yellowish-gray dust. Cilia of 

 the inferior orbit black. Thorax dull on account of a yellowish- 

 gray dust. I cannot discover any hairs upon the scutellum. La- 

 mellae of the hypopygium small, pale-yellow, short and sparsely 

 fringed. Pleurae without yellow coloring on the posterior margin. 

 Coxae and feet pale-yellowish. Middle coxae on the outside 

 almost up to the tip and hind coxae at the basis, of a dark color. 

 Tarsi hardly infuscated towards the tip. Cilia of the tegulae 

 black. Wings with a slight gray-yellowish tinge. The third 



