34 IOWA STUDIES IN NATURAL HISTORY 



the axis of the wing; third median segment less than half the 

 second, and rather shorter than the first; a curved recurrent 

 nervule starts from the end of the cell. Secondaries with the 

 discocellulars very slender; third median segment very short; 

 second subcostal segment also short. Primaries short, slight- 

 ly truncate at the tip; no costal fold in the male; second- 

 aries with a projection in the middle of the outer margin from 

 the end of the median nervure. Hind tibiae with two pairs of 

 spurs. ' ' 



"Type Thanaos potrillo Lucas." (Original description). 



This appears to be a good genus, and the one species which 

 occurs in our fauna can easily be placed by the peculiar lobe on 

 the outer margin of the secondaries. Fig. 10. 



1. CABARES POTRILLO 



Thanaos potrillo Lucas, Sagra's Hist. Cuba vn, 641, 1857. 

 Biol. Cent.-Am., Rhop. II, 337, pi. 80, ff. 24, 25, 26, 1894. 

 The species is occasionally taken in Texas. 



Genus COGIA Butler 

 Cogia Butler, Trans. Ent. Soc. London 1870, 508. Type Cogia 

 hassan Butler. 

 Palpi porrect; second joint heavily clothed with scales; third 

 small but not concealed. Antennae about one-half as long as 

 primaries; club moderately thick, tapering into the short, re- 

 flexed apiculus. This is about half as long as the rest of the 

 club and is usually bent at about a right angle. Shape of wings 

 similar to Thorybes but costa of primaries less strongly curved 

 and secondaries a little more produced anally. Cell of primaries 

 about two-thirds as long as wing; vein 5 intermediate between 

 4 and 6 ; recurrent vein faintly indicated, nearer to 4 than to 3. 

 Primaries of male without costal fold but secondaries with a 

 short tuft of scales lying in the fold along vein lb near the base 

 of the wing. Fig. 10. 



Key to the species 



1. Fringes fuscous 2 



Fringes white hippalus 



2. Subapical spots indistinct; those between veins 2 and 4 usually lack- 

 ing ; color dark calchas 



Subapical spots clear; those between 2 and 4 usually present; color 

 pale fuscous otitis 



