COCCIDAE FROM LOWER CALIFORNIA 



71 



Genus ORTHEZIA Bosc. 



Orthezia caudata n. sp. 



Fig. 1. 



Type from a very large, shrubby composite, probably Encelia palmer i, 

 at Todos Santos. 



Habit. Dried specimens, with sac, about 5-6 mm. long, the sac 

 occupying about half the total length. The lateral margins bear short 

 tassels and in fully grown examples the dorsal plates extend to the 

 margins, entirely concealing the derm, although in immature examples 



Fig. 1. Orthezia caudata n. sp. : patch of spines from dorsum of abdomen. 



there is a distinct, submedian bare area on each side. Arising from about 

 the anus is a single long, slender process which extends fully to the end 

 of the ovisac. Ovisac moderately stout, curved upward at the apex, com- 

 posed of a single broad ventral plate and several narrow dorsal plates. 



Morphological characteristics. Derm with the usual areas of clubbed 

 spines and also with areas of much larger, very conspicuous black spines. 

 Those of the smaller size are rather sparsely distributed over 'the entire 

 dorsum while those of the larger size are arranged in conspicuous clus- 

 ters (Fig. 1). There appears to be much variation in the size of these 

 clusters and their arrangement, but in general it appears to be about as 

 follows : each thoracic segment with a large, submarginal cluster on each 

 side and each of the first four abdominal segments with two small clusters 

 on each side, although these may in part be lacking. Abdominal spiracles 

 very small, apparently but five pairs present. 



Notes : The distinctive feature of this species in life is the long, caudal wax 

 tassel. Morphologically it differs from any other species known to me by the 

 presence of the conspicuous areas of large spines. 



