THE COCCIDAE OP CALIFORNIA. 47 



three between second and third lobes; a group of three or four larger 

 ones laterad of third lobe; and another group of four or five still larger 

 ones about midway between this group and the penultimate segment. 

 Each of the three segments preceding the last bears on each lateral 

 margin about seven plates. Two spines accompany each group of 

 plates, one on the dorsal surface and one on the ventral. The first and 

 second spines of each side are very small; the third, which is between 

 the second and third lobes, is the largest; the fourth and fifth are suc- 

 cessively smaller. There are two conspicuous club-shaped organs which 

 appear like thickenings of the body wall, but which are really within 

 the body cephalad of the mesal lobes. These organs are about three 



times the length of the mesal lobes; they con- 

 verge caudad, and the cephalic end of each is 

 suddenly enlarged. This species may be dis- 

 tinguished from any other known American 

 coccid by the presence of these organs. 



FIG. 22. Howardia biclavis. FIG. 23. Section of branch showing the mining habits of the 



(Mining Scale.) scale. Greatly enlarged. 



This scale is not to be found in California. Occasionally it is met 

 with at quarantine, but is never permitted to pass, as the plant upon 

 which it is found is immediately burned. At one time 325,000 orange 

 trees infested with this and other scales were burned at quarantine at 

 the port of San Pedro, and probably it was owing to this fact that it 

 has been accredited as "Habitat: California." 



Diaspis bromelise Kern. 

 (Pineapple Scale.) 



Scale of Female. Circular, with the exuviae nearly marginal. The 

 scale is white; the exuviaB are very light yellow. The first larval skin 

 is usually naked; the second covered with a delicate film. Diameter of 

 scale, 2 to 2.4 mm. 



Female. The body of the female is broadly ovate in outline; it is 

 variable in color ; it is usually a pale dirty yellow, with a faint tinge of 

 purple; some are whitish yellow, with irregular pale-purplish markings; 



