26 IOWA STUDIES IN NATURAL HISTORY 



conspicuous. Antennae less than one-half as long as primaries, 

 club relatively smaller and thicker than in Goniurtis, and more 

 broadly curved, with the apiculus less distinct. Primaries with 

 the apex subtruncate, outer margin concave below apex. Cell 

 about three-fourths as long as wing; recurrent vein nearer to 

 vein 3 than to vein 4 ; bases of 3 and 4 much farther apart than 

 M. D. C. and L. D. C. combined. Costal fold present in our 

 species. Fig. 7. 



Type: Eiidamus alhofasciatus Hewitson. 



Catillus, a Central American species, and albofasciatiis are 

 very closely related, and agree in the form of the male genitalia. 

 Zilpa differs somewhat in the form of the wings and the male 

 genitalia, but on the whole it is apparently related to the other 

 species, and with them distinct from Goniuriis. The difference 

 is scarcely greater than between proteus and simplicius. 



1. CHIOIDES ALB0FASCIATU8 



Eudamus alhofasciatus Hew., Desc. Hesp. 3, 1867. 



Biol. Cent.-Am., Ehop. Ii, 280, pi. 75, f. 11, $ gen., 1893. 



Skinner, Trans. Am. Ent. Soc. xxxvil, 197, 1911. 



Texas, March. Arizona, July and September. Distinguished from zilpa 

 by the long narrow white band on the under surface of the secondaries. 



2. CHIOIDES ZILPA (Plate I, Fig. 5) 

 Goniurus zilpa Butler, Lep. Exot. 109, t. XL, f. 2, 1872. 

 Biol. Cent.-Am., Khop. ii, 279, pi. 75, f 8, ^ gen., 1893. 

 Patagonia Mts., Arizona, May. Kerrville, Tex., September. 



Genus CODATRACTUS nom. nov. 

 Eeteropia Mabille, Le Nat. 1889, 68. Type Heteropia imitatrix 



Mab. Preoccupied in sponges by 

 Heteropia Carter, Ann. &Mag. Nat, 

 Hist. (5), XVIII, 47, 1886. 

 Structure in general similar to 

 Chioides but with veins 3 and 4 of the 

 primaries not so far apart at their 

 bases as the combined length of the 

 two discocellulars and the recurrent 

 vein nearer to 4 than to 3. The an- 



Fiff. 7. Chioides zilpa Butler, a. , i t i, • £ •£ i 



Detail of neuration end of cell of tcnual Club IS tuSltorm, morC Or IcSS 



Su? cod«S.;'a£enT Hew! sharply bent near the middle but with 

 it ?rlmir^' d." ctroF^antennt! the distal portiou uot differentiated. 



