104 CALIFORNIA ACADEMY OF SCIENCES. 



and fourth spots from the costa wholly red; three spots in cell, 

 two yellow and one red; hind wings have fiist a row of marginal 

 red spots, followed by three rows of j'ellow, then, in some, an elon- 

 gated twin spot of red; the basal area has four angulate spots of yellow, 

 three forming a triangle. Under side of anterior wings a subdued brownish- 

 red, the marginal row scarcely defined; in some examples, however, there is a 

 black zigzag line that cuts off the marginal row; the second and third rows 

 are repeated faintly, and the markings of the upper surface are faintly vis- 

 ible; hind wiugs have an unbroken marginal border of red which continues 

 firmly along a third of the inner margin. The second band consists of 

 seven conical spots of yellowish white; the third row is made up of 

 rounded or angulate spots of red, attended more or less by a yellow halo, 

 and in some^ t^pecimeus the spot is circular, and a dot or pupil adorns the 

 center; the fourth row contains eight large elongate spots of whitish-yellow, 

 cut unequally by a black line, but the first spot on the front margin is 

 almost equally divided; the basal area is red and contains three yellowish 

 spots, the largest of which is sometimes divided by a reddish spot. Female 

 exhibits the same markings as the male; with the exception of the marginal 

 borders and a faint tinge of red on one horn of the bifid banti, the whole 

 surface is of sombre black. 



Palpi reddish; antennse yellowish; abdomen with five dorsal segments 

 fringed with rusty brown, and a white row of spots on each side of the dorsal 

 ridoe; beneath, through the center, it is whitish. 



Expanse: male 1|; female 2^ inches. 



Larva. — Deep black, sparing!}' irrorated with white. Seven of the dorsal 

 spines light yellow, with a fine line of deeper yellow forming a ring around 

 the base of each. A double line or band of white occupies the dorsal 

 region, interrupted bj' the base of the spines, and longitudinally separated 

 by a fine black line that runs along the dorsal ridge; the sub-dorsal row of 

 spines black on a black ground, the next row of spines also black, but at 

 the base below each of seven spines is a j'ellow crescent -shaped spot 

 which interrupts a broad spiracular band of white; the next row of spines 

 black, then a narrow lougitudinal line of scattering white spots; then follows, 

 above the feet, a row of twin diminutive yellowish spines, which interrupts a 

 line of white. Beneath is a double line of white. The hairs below the 

 spiracular line brownish. The head, prolegs, base of feet and spines (except 

 the seven dorsal) black and shiniug. Caterpillar looks very like that belong- 

 ing to M. Leanira, and therefore more attenuated than that of the robust 

 M. Chalcedon. 



Food plant Pentstonon, but will feed upon the flowers of Custilleia, and 

 upon the leaves of Plantago major. 



Chrysalis. — Dull white, prothorax with two yellow tubercles, the first 

 dorsal segment has also two, the second three, the fourth to the tenth have 

 five tubercles on each dorsal segment. In the front of each tubercle is a 

 black curved spot often uniting. There are also some black spots on each 



