468 NORTH AMERICAN DIPTERA 



pilose. Acrosticals and dorsoeentrals 3-3, the posterior presiitiiral acro- 

 sticals situated close to the suture; posterior sublateral and posthumeral 

 bristle present ; two sternopleurals; prosternum bare, narrow. Apical cell 

 ending close to the wing-tip ; third vein with three bristles basally. 

 Abdomen elongate oval, each segment with marginals, the second and 

 third with discals; ovipositor simple. Black, the head and thorax ciner- 

 eous pollinose, the mesonotum mostly brownish; bases of abdominal seg- 

 ments very narrowly white pollinose. Length, 4.5 mm. Genotype: — 

 0. nitida, n. sp. (Panama). 



Anadiscalia, new genus 



Male and female. — Head twice as high as long; front narrow, 

 female with two pairs of orbitals; ocellars long; outer verticals w^eak; 

 cheeks and parafacials extremelj^ narrow; face retreating but slightly; 

 oral margin not prominent, the ridges bare; proboscis short, the palpi 

 clavate; antennae reaching almost to the oral margin, the second segment 

 short; arista bare; eyes short haired. Acrosticals and dorsoeentrals 3-3; 

 posthumeral and posterior sublateral present; two sternopleurals; 

 prosternum haired. Apical cell ending moderately before the wing-tip; 

 third vein with two bristles basally. Abdomen oval, not deep. Black, 

 cinereous pollinose; palpi, humeri and abdomen reddish yellow, the ab- 

 domen with a more or less distinct median vitta, the apices of the seg- 

 ments more or less, and the fourth segment almost entirely black. All 

 segments with marginals but without discals. Length, 6 to 7 mm. Geno- 

 type: — A. hasalis, n. sp. (Panama). 



Zuanalia, new genus 



Female. — Arista long plumose; front wide, with two pairs of orbi- 

 tals; ocellars long; outer verticals moderately strong; cheeks almost 

 half as wide as eye-height; parafacials bare; face strongly retreating 

 on upper part, the oral margin slightly produced; proboscis short; palpi 

 clavate, antennffi reaching almost to the oral margin. Acrosticals 3-1, 

 the presuturals very weak; dorsoeentrals 3-4; posterior sublateral absent; 

 posthumeral present; sternopleurals 2-1; prosternum bare. Apical cell 

 ending a little before the wing-tip; bend of fourth vein with appendage; 

 base of third vein with about four bristles. Abdomen short oval, rather 

 deep. Head, thorax and legs reddish in ground color; head yellow 

 pollinose; mesonotum metallic blue, cinereous pollinose, trivittate; abdo- 

 men wholly metallic blue, the bases of the segments cinereous pollinose. 

 Length, 10 mm. Genotype: — Z. azurca, n. sp. (Panama). 



