THE COCCIDAE OF SOUTHWESTERN UNITED STATES 15 



Lecaniodiaspis sp. 



Host and locality. From Holacantha emoryi, eight miles west of 

 Ludlow, Cal. 



Habit. Test in all respects resembling that of L. rufescens, oval, 

 about 3 mm. long and 2.5 mm. wide, with a few slightly elevated points 

 on the dorsum, white to yellowish. 



Morphological characteristics. Stigmatic spines present only in 

 connection with the anterior pair of spiracles, large, variously misshapen, 

 appearing either singly or in pairs. Three pairs of cribriform plates 

 present, these corresponding to the posterior three of other species. 



Notes: The existing descriptions of all the American species of this group 

 are inadequate for purposes of identification and as this may well be a described 

 form I refrain from giving it a name. It is certainly not the species here recorded 

 as L. rufescens. 



Genus OLLIFFIELLA Ckll. 



Coccidae referable to the sub-family Dactylopiinae (of the Fernald 

 Catalogue), belonging to the Eriococcus group and probably most nearly 

 related to the genus Kermes. Adult female with well developed legs and 

 antennae, the latter five to six-segmented ; without anal lobes ; anal ring 

 apparently hairless, borne at the inner end of a short invagination ; derm 

 with 8-shaped pores ; tubular ducts very minute, of the type found in 

 Eriococcus and related forms. First stage larva with well developed anal 

 lobes; with rows of dorsal spines; with six-segmented antennae; with 

 six hairs on the anal ring. 



Type of the genus, Olliffiella cristicola Ckll. 



Notes: When this genus was first described it appears to have been regarded 

 as most closely related to some of the strange gall-making forms of Australia, 

 but Cockerell has since assigned it to the Eriococcus group, a position that is in 

 all probability correct. In its immature stages (except for the presence of the 

 8-shaped pores) O. cristicola is scarcely, if at all, separable generically from the 

 corresponding stages of certain species of Kermes. The presence of 8-shaped 

 pores is somewhat disturbing, but it should be noted that these pores are 

 not as distinctive of the Asterolecaniine group as has been thought, being devel- 

 oped in some of the Monophleboid forms (Stigmacoccus asper) as well, and it 

 hardly seems that this single character should outweigh all the other evidence. 

 It should also be noted that Cockerell's statement that the tarsi are distinctly two- 

 segmented is entirely erroneous. The tarsi present no abnormal characters. 



Olliffiella cristicola Ckll. 

 Fig. 4. 



Type host and locality. From Quercus wrightii (which according 

 to recent authorities is Q. pungens), N. Mex. 



