THE COCCIDAE OF SOUTHWESTERN UNITED STATES 13 



Genus STOMACOCCUS Ferris. 



Stomacoccus platani Ferris. 

 1917. Stomacoccus platani Ferris, Can. Ent., 49:375-8, fig. 36-39. 



Type host and locality. From Platanus racemosa, Stevens Creek, 

 Santa Clara County, Cal., and from the same host at Pasadena, Cal. 



Material examined. From Platanus wrightii, Sabino Canyon, Tuc- 

 son, Ariz., June 25th. 



Notes: This species has not previously been recorded from any point out- 

 side of California. I am informed that it occurs on "Oriental Sycamore" at 

 Fresno, in this state. 



Genus XYLOCOCCUS Loew. 

 Xylococcus macrocarpae Coleman. 



Professor Cockerell has sent me specimens of this species from Li- 

 bocedrus decurrens at Julian, sixty miles northeast of San Diego, Cal., 

 collected by E. Bethel. This has been recorded from the same host 

 before, but not south of the central part of the state. 



Genus ORTHEZIA Bosc. 

 Orthezia nuda n. sp. 



Type host and locality. From Quercus emoryi, between Benson and 

 Dragoon, Ariz., June 28, 1918. 



Habit. Length of dried specimen with ovisac 4.5 mm. ; length of ovi- 

 sac 2.5 mm., width 2.5 mm. Dorsum entirely destitute of secretion ex- 

 cept for a fringe of very short marginal tufts about the posterior portion 

 of the abdomen. Ovisac as broad as long and but little longer than the 

 length of the body, straight and with the tip truncate; composed of 

 numerous narrow plates of rather loose secretion. 



Morphological characteristics. Dorsum entirely destitute of spines 

 except for a very few on the head between the antennae. Lateral margins 

 of each abdominal segment, except the first, each with a small area; a 

 small area behind each thoracic spiracle ; a small area just caudolaterad 

 and one just caudomesad of each posterior coxa. Ring of spines and 

 pores from which the ovisac arises well defined. Antennae eight-seg- 

 mented. Seven pairs of abdominal spiracles present. 



Notes: The complete absence of secretion on the dorsum and the short, 

 stout ovisac seem to distinguish this from any described species. 



