ORTALID^E — DIACUITA. 113 



yellow. Wings comparatively long and narrow, of a very equal 

 breadth, in the middle only a little broader than at the basis and 

 at the apex; stigma strikingly long; the third longitudinal vein 

 gently curved backwards towards the tip, and hence, the subrnar- 

 ginal cell very much expanded towards its end ; the crossveins 

 very distant from each other ; the fourth longitudinal vein, 

 towards its end, gently bent forward, and hence, the first poste- 

 rior cell narrowed towards its end ; the posterior angle of the 

 anal cell is drawn out in a narrow lobe, which is considerably 

 longer than the cell itself. The surface of the wing is bright, 

 shining, hyaline, upon its posterior half only with a weak trace 

 of a grayish-brown tinge. The design on the wing consists of a 

 broad, black, or blackish-brown border of the costal margin and 

 of the apex; the posterior limit of this border runs, at the basis 

 of the wing, along the fifth longitudinal vein ; at the basis of the 

 discal cell, it suddenly turns towards the fourth longitudinal 

 vein, and, after running alongside of it for a short distance, it 

 turns suddenly towards the third longitudinal vein, alongside of 

 which it runs as far as a little beyond the small crossvein, here, 

 just opposite the end of the first longitudinal vein, it abruptly 

 turns towards the second longitudinal vein, leaves open a small 

 segment of a circle just above it, returns towards the second vein, 

 follows it for some distance, and, abruptly turning again, crosses 

 the submarginal and first posterior cells, turning towards the 

 apex in the vicinity of the fourth vein, alongside of which it 

 reaches the margin. This border is perceptibly broader at the 

 tip than along the anterior margin, and can therefore also be 

 described as a large spot, entirely confluent with the border along 

 the anterior margin. Inside of the dark anterior border, there 

 are three small, almost hyaline spots ; the first lies at the end of 

 the second basal cell, the second, almost cuneiform, is in the 

 marginal cell, before the origin of the third longitudinal vein, the 

 third at the extreme tip of the costal cell ; in the marginal cell, 

 beyond the end of the first longitudinal vein, between the small 

 hyaline spot in the shape of a segment of a circle and the costa, 

 there is a spot, tinged with yellowish-brown ; the broad black 

 border along the apex is sometimes a little diluted in its middle. 



Hab. Mexico (G-ermar). 



Observation. — In the register of the second part of Wiede- 

 mann's Aussereur. Zw T eifl. Insecten, there is a Platy stoma costalis, 

 8 



