NOTES ON MIRANDA AURANTfA 1 43 



smaller, being only about one fourth as long as the female. There 

 is a pair of palpi that attract attention on account of their size. 

 The abdomen has a broad band of brown along the middle of the 

 back, and on each side there is a band of white. 



The body of the young spiderlings, is quite slender, and, while 

 still in the egg-sac, shows hardly any differentiation of color. But 

 soon after they emerge they begin to show color characteristics. 

 The ground-color is pale brown or black and the markings are gray 

 instead of the strong yellow and black of the adult. The legs are 

 marked at the ends and in the middle of each joint with dark rings. 



The anatomy of the species, both external and internal, 

 is that common to all true spiders. These notes, therefore, will 

 indicate only those structures wherein Aurantia differs from the 

 type. 



The term "areas" of the head" is used by some authors. 

 But since there are no sutures to limit spaces, this terminology 

 seems to have only a questionable practical value. 



The "eye-space" — that area of the head bounded by a 

 line drawn around the eyes — is quite small in this species. In form, 

 it might be described as trapeziform. 



The eyes of this spider are all simple. They are eight in 

 number, and there are no facets. They are the so-called diurnal 

 eyes; nocturnal eyes are lacking. In arrangement, they are so 

 separated as to occupy nearly the whole width of the head. 



The eyes are not elevated and, hence, the "ocular tubercle" 

 is absent. 



The chelicerae are short and stout, and consist of a basal 

 segment and a terminal claw. The lateral condyles seem to be 

 wanting. There is, however, a furrow in the basal segment, armed 

 with a row of teeth. 



The next departure from the anatomy of the type occurs 

 in the legs. The usual seven parts are present and are easily dis- 

 tinguishable, — coxa, trochanter, femur, patella, tibia, metatarsus 

 and tarsus. The claws are outgrowths from the terminal portion of 

 the leg, called the pretarsus. They are composed of many hypo- 

 dermal cells. In M. Aurantia, the pretarsus seems to be a distinct 

 segment. There are three claws on each tarsus. Two of these claws 

 are placed side by side on the upper surface of the pretarsus, while 

 the third is below; the whole arrangement is triangular in form. 

 The upper, or paired claws, have a series of teeth. The third claw 



