48 IOWA STUDIES IN NATURAL HISTORY 



conical, not concealed. Club of antennae very slender, curved. 

 Costa of primaries slightly curved; apex rectangular; inner 

 margin nearly straight, outer slightly convex between apex and 

 vein 2, thence nearly straight to anal angle. Costal fold absent. 

 Cell less than two-thirds as long as wing; vein 5 intermediate; 

 2 slightly nearer to base of wing than to 3. Secondaries broadly 

 rounded ; inner margin nearly straight, anal angle sub-rectangu- 

 lar; outer margin slightly concave between veins 4 and 6 and 

 very slightly between lb and 2. Vein 5 present, very weak; 2 

 about as near to base of wing as to 3. Fig. 15 



1. XEN0PHANE8 TRY XV S (Plate I, Fig. 3) 

 Papilio tryxus Cramer, Pap. Exot. iv, 87, pi. ccoxxxiv, G, H, 1781. 

 Biol. Cent.-Am., Ehop. ii, 387, pi. 85, f. 18, $ gen., 1895. 



Brownsville, Texas, July. 



The species is easy to recognize in our fauna by the many hyaline spots 

 in the discal area of both wings. 



rIE2^ Geneus MELANTHES Mabille 



<» Melanthes Mab., Gen. Ins. xvii, 80, 1904. Type 



^ Nuoniades hrunnea H.-S. 



In general structure this genus is close to Than- 

 aos but the secondaries are relatively a little larger 

 the outer margin of the primaries longer and more 

 oblique, the apex more produced and rectangular 

 and the anal angle more broadly rounded. The 

 antennae are moderate and the club fusiform, 

 sharply pointed and evenly curved. Fig. 16. 



Fig. 16. Meian- 1- MELANTHES BRUNNEA (Plate I, Fig. 10) 



S. a. Club of aii- Nisoniades hrunnea H.-S., Corr.-Blatt. Regensb. xviii, 172, 

 1864. 

 Skinner, Ent. News xrv, 110, 1903. 

 I have this species from Cuba but Dr. Skinner's record. Sugar Loaf Key, 

 Fla., is the only one which has reached me concerning its occurrence in the 

 United States. The even brown shade of the wings, with a few hyaline 

 points on the primaries, is characteristic. 



Genus CHIOMARA Godman & Salvin 

 Chiomara G. & S., Biol. Cent.-Am., Rhop. n, 453, 1899. Type. 

 Achlyodes mithrax Mosehler. 

 Similar to Thanaos ; outer margin of primaries only two-thirds 



tenna. b. Outline 

 of wings 



