236 BULLETIN 15 7, U. S. NATIONAL MUSEUM 



Argynnis idcdia. — The males have a strong, sweet, and spicy odor, 

 which in general resembles that of the following species, but is 

 sweeter and more flowery. It is very easily detected by smelling the 

 upper surface of the fore wings, especially of more or less worn 

 specimens. Pinching the abdomen of the female causes the extrusion 

 dorsally from between the last two segments of a short and thick 

 grayish forked organ somewhat resembling the osmeteria of the 

 caterpillars of the swallowtails, which are protruded from the first 

 thoracic segment. This has a powerful nauseating smell, which is 

 much like that given off from the osmeteria. 



Argynnis cyhele. — The males have a strong spicy odor resembling 

 that of sandalwood. The scent organ of the females is somewhat 

 stouter than that of the females of A. idalia and is orange in color. 

 Its odor is particularly strong and nauseating. 



Argynnis aphrodite. — The odor of both the males and the females 

 exactly resembles that of the corresponding sex of the preceding 

 species. 



Brenthis tnyrina. — The female possesses a scent organ resembling 

 that in the females of the preceding species. 



Euptoieta claudia. — The males have a rather strong spicy odor 

 resembling that of the males of Argynnis cyhele. 



Subfamily DANAINAE 



Danaus plexippus. — The scales within the little pouch on the hind 

 wings of the males emit an odor resembling the faint sweet fragrance 

 of red-clover blossoms, or of the flowers of the common milkweed. 

 With this is a faint cockroachlili:e odor, which is found alone, and 

 much stronger, in the females. 



Family LYCAENIDAE 

 Subfamily LYCAENINAE 



Lycaenopsis argiolus. — The males have, according to Mr. Scudder, 

 an exceedingly delicate odor, which is comparable to that of newly 

 stirred earth in spring, or of crushed violet stems. 



Family PAPILIONIDAE 

 Subfamily PIERINAE 



Eurevia lisa. — The males have a pronounced fragrance, which is 

 somewhat similar to that of the males of the yellow clover {C olios 

 philodice)., but sweeter and more flowery. In spite of the small size 

 of this butterfly the odor is very easy to detect. 



Colzas eurytheme. — The males of the deep orange form have a 

 rather strong and very sweet odor somewhat suggesting heliotrope. 

 This odor is constant and very uniform. 



