106 REPORT UPON A COLLECTION OF 



Pseudodiaspis dentilobis Ckll. 

 Fig. 26C. 



1898. Aspidiotus (Pseudodiaspis) dentilobis Ckll., Ann. Mag. Nat. Hist., (7) 

 1 :438. 



Type from undetermined host and from Acacia and Mimosa at 

 Cuatla, Mexico. 



Habit. Scale of the female about 2 mm. in greatest diameter, 

 slightly oval, moderately convex, gray or blackish ; exuviae submarginal, 

 the first bare, the second normally covered with secretion. Scale of 

 male resembling that of the female in color and texture but distinctly 

 elongate with the exuvium at one end. 



Morphological characteristics. This species is very similar to P. 

 magna described above. The form of the body and the general char- 

 acters of the pygidium are practically identical but there is a distinct 

 difference in the shape of the lobes, those of dentilobis (Fig. 26C) hav- 

 ing the lateral margins parallel and the tips distinctly truncate. Also 

 the ducts of dentilobis are much more slender than in magna. The first 

 stage is identical with that of magna. 



Notes: This species has not been taken in Lower California but I am in- 

 cluding it because of its close relationship with P. magna and in order to make 

 the discussion of this genus more complete. The above notes, and the accompany- 

 ing figure are based upon specimens labeled as from "Mimosa, Cuatla, Mexico," 

 received from O. E. Bremner, and probably to be regarded as type material. 



Pseudodiaspis prosopidis n. sp. 

 Figs. 26A, 27, 28. 



Type from Prosopis sp. at La Paz. Also taken from the same host 

 at other places in the area visited. 



Habit. Scale of the female 2.5-3 mm. in diameter, circular, flat, 

 white, thick and firm; exuviae submarginal covered with secretion; 

 ventral scale developed only about the margin but quite thick. Scale 

 of male elongate, with exuvium at one end, in color resembling that of 

 the female. 



Morphological characteristics. Adult female (Fig. 27A) about 2 

 mm. long ; general form somewhat elongate oval ; derm at maturity 

 heavily chitinized. Lateral margins of the abdominal segments pro- 

 jecting but little, with numerous pores but with no gland spines. Dorsunr 

 of the abdomen with numerous small ducts along the posterior margins 

 of the segments except for a rather wide median area. 



Pygidium (Fig. 28) with two pairs of prominent lobes with nearly 

 parallel sides and with their apices somewhat sloping; each lobe con- 

 tinuous at its base with a club-shaped paraphysis. Beyond the second 



