74 REPORT UPON A COLLECTION OF 



quently forming a prominent crest. Rubbed specimens of a uniform green. 

 In no case was the species observed to cause the formation of pits. 



Morphological characteristics. Adult female (Fig. 3A) (on slide) 

 about 1 mm. long, nearly circular, the caudal region projecting slightly. 

 Margin with a series of small 8-shaped pores which is continuous except 

 for the caudal region, this series accompanied by a row of small, circular 

 pores for a short distance on each side of the stigmatic depressions only. 

 Dorsal pores numerous, of two sizes, the smaller size slightly larger than 

 those of the marginal series, the others about twice as long (Fig. 3C) 

 with some intergradation between the two extremes. Anal lobes (Fig. 

 3B) closely united, not chitinized ventrally. Anal ring with six slender 

 setae. Tubular ducts numerous, of the same type as in A. pustulans. 



Notes: Among the specimens which I refer to this species there is a 

 considerable degree of difference, examples from Celosia and Jatropha having 

 the dorsal pores fewer and with the large pores distinctly concentrated in the 

 median region. It is possible that two species are involved but the speicmens 

 agree in other respects and the material available is not sufficient to permit the 

 study of extensive series. 



The species differs from A. pustulans most conspicuously in the incomplete 

 marginal series of circular pores and also in the variable size of the dorsal pores. 



Genus DACTYLOPIUS Costa. 

 Dactylopius confusus (Ckll.). 



Previous records. Montana, Arizona, and New Mexico, on various 

 species of Opuntia, and under subspecific names from various other coun- 

 tries where it has been introduced. 



Lower California records. From flat Opuntia ("nopal"), at La Paz 

 and La Palma. 



Dactylopius tomentosus (Lam.). 



Previous records. Arizona, New Mexico, and southwestern Cali- 

 fornia and England (introduced from Arizona), on Opuntia. 



Lower California records. From a cylindrical Opuntia ("cholla"). 

 at La Paz, San Jose del Cabo, and Cabo San Lucas. 



Genus ERIOCOCCUS Targ. 



Eriococcus bahiae Ehrh. 



1920. Eriococcus bahiae Ehrh., Ferris: "Scale Insects of the Santa Cruz Penin- 

 sula," Stanford University Publications, Biological Sciences, 1:1:17, fig. 4. 



Previous records. From Eriophyllum confer tiflorum, near Stanford 

 University, Calif, (type), and Gutierrezia sp., near Las Cruces, New 



