2 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.63. 



there are no orbitals. Para frontals with small hairs below on the 

 widened portion, continuing along the parafacial almost to the lower 

 edge of the eyes, but not very conspicuous; palpi rather large, 

 proboscis small. 



Thorax without any striking peculiarities, chaetotaxy as follows: 

 Acrostichals, 1 anterior; 2 (small) posterior far back; dorsocentrals, 



3 anterior, 3 posterior (one of the anterior is quite far down on the 

 neck); humeral, 2; presutural 1 large; interhumeral 1; notopleural 

 2; intraalar 2; supraalar 1; postalar 2; sternopleural 2 anterior, 1 

 posterior; pteropleural 2 or 3 minute; mesopleural 5 in posterior 

 row. Scutellum with two lateral, no apical. Below the scutellum 

 the usual transverse ridge of the Tachinidae. 



Abdomen normal, no piercer, no discals. Legs normal, fore tai-si 

 of female not flattened. Wing with fourth vein rounded at bend, 

 ending almost in the apex; first vein bare, third bristly more than 

 halfway to the small crossvein, also with several bristles below at 

 base ; apical cell narrowly open ; costal spine present but small ; third 

 costal segment about half as long as fifth. 



The genus is allied to Emp?Lanopteryx Townsend, but has narrower 

 parafacials, no discal macrochaetae, and first posterior cell ending 

 more nearly in the apex. 



Type of genus. — The following species. Xo other is known. 



OCHROMEIGENIA ORMIOIDES Townsend. 



Male. — Wholly yellow. The wing-veins yellow except the cross- 

 veins and tip of the auxiliary vein, which are blackish; front at the 

 narrowest point hardly wider than the ocellar triangle ; frontal stripe 

 reddish yellow; arista j^ellow, thickened on the basal fifth; palpi 

 rather stout, with black hairs. Thorax slightly opaque above with 

 yellowish pollen. First abdominal segment without marginals, sec- 

 ond with a stout erect pair, third with a row of ten, fourth with a 

 similar row. The abdomen has very thin yellow pollen, and there 

 are slight traces of a dark band along the posterior edge of the second, 

 third, and fourth segments. Legs entirely yellow, the tarsi appear- 

 ing a little darker from being covered with dense black hairs; middle 

 tibia with one bristle on the outer front side at two-thirds its length, 

 a small one on the inner front side at the same level and three on the 

 outer hind side; hind tibia with two each on the inner hind, outer 

 hind, and outer front sides. Wings not very hyaline, rather uni- 

 formly brownish. 



Female. — Front twice as wide as the ocellar triangle ; palpi longer 

 than in the male and distinctly swollen toward the apex. Abdomen 

 curved downward, the second, third, and fourth tergites being much 

 narrower below than above. This brings the genital opening rather 

 far forward underneath and not at the apex. Otherwise as in the 

 male. 



