16 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.72 



Vibrissae at oral margin, facial ridges with a few hairs below ; para- 

 facials rather narrow, with a few distinct hairs all along near facial 

 ridge. Third antennal joint elongate, moderately slender, three 

 times the second, basal joints of arista short. Palpi normal, pro- 

 boscis short. Thoracic chaetotaxy: acrostichal 3, 1; dorsocentral 

 3, 4; humeral 3; posthumeral 1; presutural 2 (inner hairlike) ; noto- 

 pleural 2; supraalar 3; intraalar 3; postalar 2; sternopleural 1, 1; 

 pteropleural small; scutellum with 3 lateral, only a minute hair or 

 two at apex, one smaller discal pair. 



Abdomen slender; one large median marginal on first and second 

 segments,, marginal row on third and fourth; second and third seg- 

 ments with 2 pairs discals, fourth thinly covered with bristles. Geni- 

 talia small, concealed. Sternites after the first concealed by over- 

 lapping of tergites. Legs long, claws and pulvilli large. 



Wings long and narrow, first posterior cell open only a little 

 before extreme apex, fourth vein with rounded curve; veins bare 

 except a few hairs at base of third. 



Type of genus. — Gym/nostylia omata Brauer and Bergenstamm. 



OXYAPORIA ORNATA Brauer and Bergenstamm 



Male. — Black, abdomen broadly yellow on sides. Head cinereous, 

 palpi yellow. Thorax with large black median spot, slightly divided 

 in the middle before the suture by a silver line which widens a little 

 posteriorly, and concave behind on account of a silvery spot before 

 scutellum; a wide silvery stripe begins at the humerus each side 

 and narrows above the wing, reaching the corner of scutellum, the 

 latter black with a little brownish reflection. 



Abdomen with thin silvery tessellation, more distinct on sides, 

 not forming crossbands except when viewed directly from behind; 

 a median ventral black stripe on the tergites. 



Legs black, elongated, the tarsi longer than the tibiae. Middle 

 tibia with one bristle on outer front side, hind not at all ciliated; 

 with one bristle on outer side below middle opposite one on inner 

 side, and nearly opposite a flexor one. 



"Wings brown, hardly paler behind; third vein with about four 

 hairs tit base. 



Length, 10,5 mm. 



Kedescribed from the type in the Vienna Museum. 



Not in the United States National Museum. 



9J. UKODEXODES CINGULATA Sclnncr 



Mcifjeriia c'vr/iilnta Schinkh. Xovnrn Ilel.so, ISGS, p. '\-7. 

 iJii 111 no Hi 111 la riiif/iildta I'.is.vitei: :iik1 Bekgexstamm, Denk, Wien. AkaO. 

 V/iss.. vol. GS, ISUl, 11. 4'Co. 



The two type males are mentioned by Schincr, and agree willj his 

 description : Labeled, " Novara 11. Brasilia." 



