300 POMONA COLLEGE JOURNAL OF ENTOMOLOGY 



Spiracles — There are two pairs of breathing organs ; the first pair is 

 located on the ventral surface nearly midway between the prothoracic and the 

 mesothoracic coxae ; the second is located nearer front than midway between 

 the mesothoracic and metathoracic coxae, on the ventral surface. 



Legs (Fig. 115 B). Normally long and hairy. Coxae longer than 

 broad, nearly as long as the femurs. Trochanters narrow and not more than 

 half as long as the coxae. Femurs stout, shorter than tibiae. Tibia long 

 and slender, twice as long as the tarsi, slender and spiny on the inner margin. 

 Tarsi with a few stout spines in inner margin. Claws normal. 



Pygidium (Fig. 115 C and D). Covered over the surface with a large 

 ijumber of circular pores, which are common to this genus. Anal lobes with 



1 large spine and 2 small, slender spines on the ventral surface, and with 



2 short stout spines and 1 hair-like spine on the dorsal surface, of each 

 lobe. Circumanal spines — normally six, which are half as long as the spines 

 of the anal lobes. On the ventral surface, just in front of these spines, 

 are two pairs of slender hair-like spines. A distinct conical cauda projects 

 backwards just below the 2 most dorsal of the spines. 



The eggs (Fig. 116) are elliptical oval in shape. Color — Straw yellow, 

 amber, "corn" or light yellow. Surface — smooth and somewhat glossy when 

 the covering threads are removed. Sice — x\verage length 0.34 mm., average 

 width 0.17 mm. They are deposited in large masses, and are intertwined and 

 bound together with fine, white, cottony threads, which are secreted and 

 exuded by the female during the process of egg-laying. The eggs are de- 

 posited in cracks, and crevices of the trees, on the fruit, especially where there 

 are clusters, in the navel of oranges and the blossom end of seedlings, under 

 the calyx, and in any other place which may afiford shelter and protection 

 for them. 



THE MALE. 



Lari'ac (Fig. 117 a). The first born are difficult to distinguish frdin 

 I he females of the same age, but the male larvae developes much faster and is 

 soon told bv its rather long, smooth, dark-colored body, and h\ the dis- 

 appearance of the mouth parts after the first moult. There are 4 moults 

 l/cfore the adult stage is attained. The antenn;e are 7-articled and are sparsely 

 covered with hair. There are two dark marginal eyes which are retained 

 throughout the entire development. 



Nympth (Fig. 117 b and c). When the brood is nearly one-third grown 

 tiic males seek a sheltered place, usually in an egg-mass, to spin their cocoon 

 in whicli their transformation is to take place. The cocoon varies from 3 

 lo 4 mm. in length, is nearly cylindrical in shape, and is spun with very fine 

 white cottony threads, such as cover the egg-masses. The nymph, if un- 

 disturbed, remains perfectly (|uiet throughout the moult, but if the cocoon 

 is destroyed at any stage, it immediately moves away to find a more suitable 

 place to make another. With age the body liccomes dark in color, the wing 

 buds, and then the wing pads appear and the large red dorsal and ventral 



