134 
Psyche 
[June 
Figs. 1-3. Phidippus opifcx (McCook). 1. left palpus. 2. Female geni- 
talia, dorsal view. 3. Epigynum. 
Figs. 4-6. P. apacheanus Chamberlin and Gertsch. 4. left palpus. 5. 
Female genitalia, dorsal view. 6. Epigynum. 
Figs. 7 - 10. P. coccineus Peckham and Peckham. 7, 8. Left palpus. 7. 
Ventral view. 8. Ectal view. 9. Female genitalia, dorsal view. 10. Epigynum. 
cerae, a black cephalothorax and black limbs, and a bright red abdo- 
men with a median black stripe. There are two pairs of minute white 
spots between the black and red areas on the posterior part of the 
dorsum of the abdomen. At the sides of the abdomen there are light 
diagonal bands, and there is also a light transverse anterior band on 
the dorsum. These markings vary in conspicuousness : the bands and 
spots may be only a somewhat lighter shade of red than the remainder 
of the abdomen, while the median black stripe may be so reduced in 
width and length that the abdomen appears solid red. Sometimes, the 
basic color is orange rather than red, and very old spiders may even 
be yellow. In this species, the adult males and the adult females are 
