THE COCCIDAE OF CALIFORNIA. 29 



This species was very destructive to the coffee plantations of the 

 Sandwich Islands, but since the introduction of the ladybird Crypto- 

 Ixmus montrouzieri from California it has been cleaned out. 



Pulvinaria rhois Ehrh. 



Ft'inale. — Found on limbs and under side of leaves, single and in 

 clusters. Length of female with ovisac, about 9 mm., width about 3.5 

 mm.; scale brown, largely covered with white secretion, ovisac snow- 

 white, distinctly grooved longitudinally, sometimes curved, sometimes 

 lifting scale off limb; scale shrunken, broadly oval, clay color. Female 

 before forming ovisac something like Coccus hesperidtnn, but more con- 

 vex, reddish brown; anal plates distinct; dorsum covered with white, 

 waxy secretion in rows, the mesal row has the largest secretions, and 

 they diminish in size as they approach the margin; edge of scale has 

 short, simple hairs; in each anterior incision is a large spine, with a 

 short one on each side. Anal plates yellowish brown, longer than 

 broad, forming a diamond when closed; two very small spines at tip; 

 anogenital ring with six long hairs; rostral loop reaching to middle 

 pair of legs. Antennae 8-jointed; formula: 3(124)5867. Joint 3 

 much the longest, joints 2, 4, 5, and 6 each with long hair, joint 8 with 

 several hairs. Legs ordinary, coxa and trochanter very stout, tarsus 

 half as long as femur; tarsal digitules long fine hairs with knobs. 



Larva. — Light yellow, flattish, elliptical, about 0.5 mm. long. 



ilfa^e.— Small, oval, black, with numerous pale, wart-like prominences. 



On Bhus diversiloba. 



Ceroplastes cirripediformis Comst. 

 (Barnacle Scale.) 



Adult Female. — Average length 5 mm., width 4 mm., height 4 mm. 

 When naked the color is dark reddish brown; the shape sub-globular; 

 with a strong spine-like projection at the anal end of the body. The 

 waxy covering is dirty white, mottled with several shades of grayish or 

 light brown, and even in the oldest specimens retains the division into 

 plates, although the form is more rounded and the dividing line by no 

 means as distinct as at an earlier age. There are visible a large convex 

 dorsal plate, and apparently six lateral, each with a central nucleus; 

 the anal plate, however, is larger, and shows two nuclei, and is evi- 

 dently two plates joined together. . Antennae 6-jointed. Legs long; 

 tibiae nearly twice as long as tarsi; digitules of the claw very large. 

 The other tarsal pair very long and slender, but with a very large 

 button. The skin is seen in places to be furnished with many minute, 

 round, transparent cellules, probably spinnerets, and along the border 



