SYSTEMATIC TREATMENT 



Genus ICERYA Sign. 

 Icerya rileyi Ckll. 



Previous records. From Prosopis and Coinllea in New Mexico and 

 Arizona. 



Lower California records. From undetermined mimosaceous shrub 

 and Prosopis sp. at San Antonio ; Prosopis sp., Casuarina sp., and unde- 

 termined ornamental at San Jose del Cabo ; undetermined mimosaceous 

 shrub on Mt. San Bernardo ; Franseria sp., at Todos Santos. 



Notes : It is with much doubt that I assign all these specimens to /. rileyi. 

 There is some difference in the form and amount of the secretions, the specimens 

 from Franseria having the ovisac very definitely yellow at the base while the 

 others are all white, and there is some difference in the size and number of the 

 setae on the body, the examples from the various hosts at San Jose del Cabo and 

 Mt. San Bernardo having the setae more numerous and more slender. 



Several species of this genus have been described from Mexico and slide 

 mounts of some of these are at hand. It is obvious that all of these forms are 

 very closely related and only a careful study of much material, and that the most 

 favorable, can settle their relationships. I therefore place the Lower California 

 material for the present with I. rileyi, the first described. 



Genus STEATOCOCCUS n. gen. 1 



1919. Paleococcus (part), Ferris: "Contribution to the Knowledge of the Cocci- 

 dae of Southwestern United States," Stanford University Publications, 

 p. 7. 



Monophleboid Coccidae of the general type of the genus Icerya, that 

 is : legs, antennae, and mouth parts present in all stages ; anal tube lacking 

 except in the first stage and in this stage very small ; adult male alate, with 

 but the caudal pair of fleshy appendages present ; abdominal spiracles 

 present only on the last three segments; antennae 10- 11 -segmented. Dif- 

 fering from Icerya in the possession of a marsupium which opens through 

 a large, circular opening just behind the posterior legs, in this respect 

 resembling Mimosicerya (=Clypeococcus), but differing from the latter 

 in not having the derm chitinized. 



Type of the genus Paleococcus morrilli Ckll. Other included species, 

 Paleococcus mexicanus (Ckll. and Parrott), P. p'lucheae (Ckll.), F. town- 

 sendi (Ckll.), and P. tabernicolus n. sp. 



*A single specimen of a species of this genus was taken from mistletoe at 

 San Pedro, but was unfortunately lost. This specimen represented an un- 

 described species characterized by the presence of several large spine-like pro- 

 cesses on the dorsum of the cephalothorax. 



