26 A CONTRIBUTION TO THE KNOWLEDGE OF 



Pseudococcus gutierreziae (Ckll.). 

 Fig. 9. 



Type host and locality. From Gutierrezia sarothrae between Las 

 Cruces and Organ, N. Mex. 



Material examined. From Gutierrezia sp., Deep Springs Valley, 

 Inyo County, Cal., and near Sandy, Utah, the latter collected by Professor 

 Doane. 



Habit. Appearance before formation of ovisac not known ; judg- 

 ing from the morphology of the insect the marginal tassels are all ex- 

 tremely short, with the caudal pair somewhat longer than the others. 

 Ovisac very long and slender, reaching a length of 10 to 15 mm. 



Fig. 9. Pseudococcus gutierreziae (Ckll.) : A, left half of the cephalic region ; 

 B, anal lobe and penultimate cerarii. 



Morphological characteristics. Length (flattened on slide) 2 to 

 2.25 mm. With not more than ten pairs of cerarii, sometimes with less, 

 there being some variation even on opposite sides of the same specimen. 

 The arrangement of the cerarii, however, appears to be constant in regard 

 to certain points, there being none on the head anterior to the ocular 

 pair. All the cerarian spines quite small and slender, those of the anal 

 lobe cerarii (Fig. 9B) being largest. Ocular pair (Fig. 9A) with three 

 to four very small spines, remainder with but two, all without auxiliary 

 setae and entirely without grouped pores, except for the anal lobe pair 

 in which there are two or three small setae and a few scattered pores. No 



