THE COCCIDAE OF CALIFORNIA. 



41 



corners, and are furnished with two long hairs upon the disk and three 

 much shorter ones at the tip. 



On orange, lemon, grape-fruit, oleander, pepper, ferns, sago palms, etc. 



The parasite Scutellista cy tinea also attacks this species, and where it 

 is found in the open holds it in subjection. 



Saissetia olese Bern. 

 (Black Scale.) 



Adult Female. Densely chitinous; dark brown, almost black in 

 color, surface roughened and minutely specked with small grayish 

 waxy granules. 

 Form highly con- 

 vex; length, 4 to 

 5 mm.; height, 

 3 mm. Dor sum 

 with a median lon- 

 gitudinal carina, 

 and two trans- 

 verse carinse, the 

 latter dividing the 

 body into three 

 subequal portions; 

 frequently the lon- 

 gitudinal ridge is 

 more prominent 

 between the trans- 

 verse ridges than 

 elsewhere, thus 

 forming with them 

 a raised surface of 

 the form of a cap- 

 ital H. Eyes incon- 

 spicuous. Scales 

 of anal operculum 

 pointed at extremities; outer edge rounded; base straight or slightly 

 concaved; outer edge twice length of base. Marginal hairs rather long; 

 extremity dilated and often deeply divided. Submarginal tubercles 

 six on each side. No stigmatic cleft. Stigmatic spines three, promi- 

 nent and sharply pointed, the median spine nearly four times the 

 length of the others. Antennae with eight joints, of which the third is 

 always the longest. Legs rather slender; tarsus about three fourths 

 length of tibia; digitules of claw rather long. Dermal cells large, irreg- 

 ular polygonal, with rounded angles j the margin of each cell distinctly 



4-c Xf^ HRAi ^^ 



f or THf A 



UNIVERSITY 



FIG. 19. Saissetia oiex (Black Scale). On olive branch, showing the 

 larvae of the ladybird Rhizobius ventralis at work destroying the 

 scales. 



