COCCIDAE FROM LOWER CALIFORNIA 95 



Genus DIASPIS Costa. 

 "Diaspis" arizonica Ckll. 



1919. "Diaspis" arizonica Ckll., Ferris: "Contribution to the Knowledge of the 

 Coccidae of Southwestern United States," Stanford University Publica- 

 tions, p. 49, fig. 24. 



Previous records. From Prosopis velutina, Arizona. 



Lower California records. From Acacia flexicaulis ("palo de fierro") 

 and Lysiloma sp. ("palo bianco") at La Paz and an undetermined mimo 

 saceous shrub at Triunfo. 



Diaspis echinocacti (Bouche). 



Previous records. A native of the western hemisphere, but widely 

 distributed in company with its hosts, the various species of cacti. 



Lower California records. On Pereskiopsis brandegeei ("alcajer") 

 at Agua Caliente. 



Diaspis simmondsiae n. sp. 

 Fig. 17. 



Type from Simmondsia calif ornica at La Paz. Also from the same 

 host at La Rivera and Todos Santos. 



Habit. Scale of the female of the type common to the genus, about 

 2 mm. in diameter. Scale of the male likewise of the type common to 

 the genus but noncarinate; frequently the males occur massed in great 

 numbers about a female, and in these cases the identity of the individual 

 scales may be entirely lost, the whole group appearing as a mass of 

 fluffy secretion. 



Morphological characteristics. Adult female 1.25 mm. long, of the 

 normal turbinate form, with the lateral margins of the abdominal seg- 

 ments projecting but little; membranous except for the pygidium. 



Pygidium (Fig. 17A) relatively large, with the median lobes (Fig. 

 17B) set in a depression, diverging sharply and with their margins 

 minutely serrate. Second pair of lobes small, but quite prominent, 

 obscurely bilobed. Third pair of lobes very small and low. Beyond the 

 third lobes are numerous small gland spines arranged singly. Tubular 

 ducts very numerous and very small, scattered. Marginal ducts some- 

 what larger than those of the dorsum, arranged as indicated in the figure. 

 Anal opening well toward the posterior margin. Ventral side apparently 

 without tubular ducts. Circumgenital pores in five groups with 6-12 

 pores in each. Margins of abdominal segments with many small ducts, 



