GYMjjOPTERNUS. 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 infuseated towards 

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

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

 parallel. 



Hob. Middle States. (Osten-Sacken.) 



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

 hi vigatiis has already been noticsd above. If the small bristles 

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

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

 with much paler tarsi. 



"IS. H. opacus Loew. % . — Viridis, modice nitens, facie et fronte 

 polline ex albo-einereo vestitis, antennis majusculis, fusco-nigris, arti- 

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

 intermediis, posticarumque basi nigricantibus ; alis ex fiavo 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 coxa? and the base of the hind 

 coxae blackish ; wings altogether pale yellowish-gray ; the small lamella? 

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

 0.13. 



Syn. Gymnopternus opacus Loew, Neue 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. Antenna? 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- 

 mella' of the hypopygium small, pale-yellow, short and sparsely 

 fringed. Pleura? without yellow coloring on the posterior margin. 

 Coxae and feet pale-yellowish. Middle coxa? on the outside 

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

 Tarsi hardly infuseated towards the tip. Cilia of the tegulse 

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



