THE COCCIDAE OF SOUTHWESTERN UNITED STATES 31 



characters of that genus. The single large duct on the ventral side of each anal 

 lobe and the other ducts of this type on the ventral side of the thorax are quite 

 distinctive characters. 



The material upon which the species is based was collected by Mr. E 

 Bethel and transmitted to me by Professor Cockerell. 



Pseudococcus steelii (Ckll. and Towns.). 

 Fig. 13. 



1894. Bergrothia steelii Ckll. and Towns., Ent. News, 5:263. 



1894. Bergrothia townsendi var. steelii Ckll. and Towns. ; Ckll., Ent. News, 5 :282. 



1902. Erium steelii (Ckll. and Towns.); Ckll., Ann. Mag. Nat. Hist. (7), 10:466. 



1903. Erium steelii (Ckll. and Towns.) ; Fernald, Catalogue Coccidae, p. 113. 



Type host and locality. From Covillea glutinosa (== Larrea mexi- 

 cana), Mesilla Park, N. Mex. 



1 



Fig. 13. 'Pseudococcus steelii (Ckll. and Towns.) : left half of cephalic region. 



Specimens examined. From Covillea glutinosa on the mesa near 

 Mesilla Park, N. Mex. 



In all respects this species is extremely close to P. irishi (Ckll.), dif- 

 fering not at all in habit and differing morphologically only in having a 

 scattered group of spines on the head in the position of the first pair of 

 cerarii. Compare Fig. 13 with Fig. 10A. 



Genus ERIUM Maskell. 

 Erium lichtensioides (Ckll.). 



1918. Erium lichtensioides (Ckll.) ; Ferris, Cal. Species Mealy Bugs, p. 75, pi. 3, 



fig. 25. 



Specimens examined. From Artemisia sp. at Magdalena, N. Mex., 

 and in Deep Springs Valley, Inyo County, Cal. 



Genus RIPERSIA Sign. 



The grass-infesting mealy bugs are a most puzzling group. Charac- 

 terized in general by a reduction in the number of pairs of cerarii and in 

 the number of antennal segments, it is possible to recognize a group of 

 species having much in common, yet difficult to define this group in any 



