70 REPORT UPON A COLLECTION OF 



I have previously (ref. cited) called attention to the fact that the 

 species of the type of Paleococcus morrilH probably are not congeneric 

 with the type of Paleococcus, and have suggested that the genus Crypti- 

 cerya might be revived for them. However, there have since come to 

 hand examples of C. rosae (the type of this genus) and this proves to 

 lack the marsupium that is a distinctive character of Steatococcus. The 

 new genus is evidently of the type of Mimosicerya (= Clypeococcus 

 Newst.), the type of which is Paleococcus hempeli, but from this it differs 

 most noticeably in the unchitinized derm and the absence of the prominent 

 clypeal region. 



The genus as at present known is characteristic of southwestern 

 United States and northern Mexico, the "Sonoran region" of biologists. 



Steatococcus morrilli (Ckll.) n. sp. 



1914. Paleococcus morrilli Ckll., Ent. News: 25; 110. 



1919. Paleococcus morrilli Ckll., Ferris: "Contribution to the Knowledge of the 

 Coccidae of Southwestern United States," Stanford University Publica- 

 tions, p. 8, fig. 2. 



Previous records. Known only from Acacia greggii in Arizona. 

 Lower California records. From Haematoxylon boreale, San Pedro, 

 beneath the surface of the soil, associated with ants. 



Steatococcus tabernicolus n. sp. 



Type from Prosopis sp. near La Rivera. 



Habit. On the smaller twigs of the host beneath shelters built by 

 ants. Owing to the attentions of the ants the Coccids were in all cases 

 entirely devoid of secretion. 



Morphological characteristics. Length (mounted on slide) 5 mm. 

 Derm entirely destitute of large spines or setae, even between the bases 

 of the antennae, except for a few quite large submedian setae on the 

 ventral side behind the opening of the marsupium. Depression contain- 

 ing the anal opening beset with numerous small spines and a few such 

 spines scattered over the body. Margin of the marsupial opening with 

 numerous pores and the remainder of the body almost without pores 

 except for the head and the posterior portion of the abdomen, where they 

 are quite numerous. Antennae 10-segmented. 



Immature stages not seen. 



Notes : Only two specimens of this species are available for study and it 

 might be thought that the absence of large spines is due to the fact that the 

 spines have been broken off, but werq this the case the bases of the spines would 

 still remain, affording evidence of their presence. The almost complete absence 

 of large setae at once distinguishes this species from the other members of the 

 genus. 



