108 IOWA STUDIES IN NATURAL HISTORY 



and with maeulation not bright yellow. No transverse row of spots 

 near base of secondaries below 7 



6. Expanse 40 to 50 mm. Larger specimens females with pale spots of 



primaries broadly confluent and veins concolorous polingi 



Expanse 50 to 70 mm., smaller specimens males with spots separated 



by dark veins or by broader dark areas aryxna, neumoegeni 



Expanse 50 mm. or slightly over. Spots small, rounded and whitish. 

 Southern California race stephensi 



7. Spots yellowish white to pale yellow; at least one extra-discal spot on 



under surface of secondaries and rarely some above streckeri 



Spots deeper yellow; extra-discal spots obsolete, not more than one or 



two fine points present, or with discal spots above race texana 



Spots greatly reduced, yellowish; extra-discal band on under surface 

 of secondaries evenly curved but irregular. Spot in end of cell of 

 primaries linear, bent, in apical angle smithii 



1. MEGATHYMUS YUCCAE 



Eudamus yuccae Boisd. & Lee, Lep. Am. Sept. pi. 70, 1833. 

 Riley, 8th Rep. St. Ent. Mo., 169-182, 1876 (Biol.). 

 Florida, Georgia, South Carolina; April and May. 



la. race COLOBADENSIS 

 M. yuccae, var. coloradensis Eiley, Trans. Acad. Sci. St. Louis in, 567, 1877. 

 Colorado, April. 



lb. race NAVAJO 

 M. yuccae, var. navajo Skinner, Ent. News xxn, 300, 1911. 

 Skinner, Trans. Am. Ent. Soc. xxxvn, 209, pi. x, 1911. 



Texas, New Mexico, Arizona, S. California; April to June. 



2. MEGATHYMUS URSUS 



Megathymus ursus Poling, Ent. News xin, 97, pi. 4, 1902. 

 Skinner, Trans. Am. Ent. Soc. xxxvii, 205, 1911. 

 Pima County, Arizona; August. 



3. MEGATHYMUS COFAQUI 



AegiaJe cofaqui Strecker, Proc. Acad. Nat. Sci. Phil. 148, 1876. 

 Skinner, Trans. Am. Ent. Soc. xxxvn, 203, 1911. 



Georgia, Florida; March. 



The male type is a form of streckeri to which Barnes and McDunnough 

 have given the name texana. The female type represents cofaqui. This 

 sex may be distinguished by the slightly emarginate outer margin of the 

 primaries and the resultant sharpness of the apex. 



4. MEGATHYMUS STRECKERI 



Aegiale streckeri Skinner, Can. Ent. xxvn, 179, 1895. 

 Skinner, Trans. Am. Ent. Soc. xxxvti, 204, 1911. 



