LEPIDOPTERA 765 



other fritillaries, this one has on the head a pair of backward bending 

 spines branched like the others. 



This species occurs from New Jersey and Pennsylvania southward 

 also in Arizona and California. 



Subfamily DANAIN^ 

 The Milkweed Butterflies 



These butterflies are of large size, with rounded and somewhat 

 elongate wings, the apical portion of the fore wings being much 

 produced. The discal cells of the wings are closed; the third anal 

 vein of the fore wings is preserved; and the antennas are apparently 

 without scales. Only a very few species of this family occur in our 

 fauna. The two following are the best-known; the others are found 

 only in the extreme South or in California. 



The monarch, Ddnaus arcMppus. — The upper surface of the wings 

 is light ruddy brown, with the borders and veins black, and with two 

 rows of white spots on the costal and outer borders as shown in Figure 



Datuius archippus. 



974. The figure represents a female; in the male the veins of the 

 wings are more narrowly margined with black, and there is a black 

 pouch next to vein Cu2 of the hind wings, containing scent-scales or 

 androconia. 



The larva feeds upon different species of milk-weed, Asclepias. 

 When full grown it is lemon or greenish yellow, broadly banded with 

 shining black. It is remarkable for bearing a pair of long fleshy fila- 

 ments on the second thoracic segment, and a similar pair on the 

 seventh abdominal segment (Fig. 975). The chrysalis is a beautiful 

 object; it is bright green dotted with golden spots, and about 2 5 mm. 

 in length (Fig. 976). 



