QYMNOPTERNUS. 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-Sacken.) 



Observation. The striking resemblance of this species to G. 

 laevigatus has already been noticed 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. laevigatus 

 with much paler tarsi. 



IS. G> opactis LOEW. % . Viridis, modice nitens, facie et fronte 

 polline ex albo-cinereo vestitis, aiitemris majusculis, fusco-nigris, arti- 

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

 intermediis, posticarumque basi nigricantibus ; alis ex flavo dilutissiine 

 cinerascentibus, lamellis hypopygii parvis, pallide flavescentibus. 



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

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

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

 cox33 blackish ; wings altogether pale yellowish-gray ; the small lamellae 

 of the hypopygiurn pale yellowish. Long. corp. 0.12 0.13. Long. al. 

 0.13. 



Sra. 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. Antennas 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. 

 Cox33 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 infuscated towards the tip. Cilia of the tegula? 

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



