160 DIASPIS CALYPTROIDES. 



Diaspis opunticola* Newstead; Ent. Mo. Mag., 



1893, p. 188, pi. iii, fig. 4, p. 281. 

 Diaspis cacti, var. opuntise, Cockerell; Journ. Inst. 



Jamaica, vol. i, p. 256. 



Scale of the female convex, approximately circular, 

 opaque white, and sometimes with a tinge of yellow. 

 Exuviae subcentral, or towards the margin; in over- 

 crowded examples they are frequently marginal, but 

 such examples are abnormal. Colour dusky ochreous 

 brown to almost black. Secretionary covering to the 

 exuvias thin and transparent. Ventral scale thin, is 

 attached to the plant tissues, and often partakes of 

 their structure. 



Diam. 2 2*25 mm. 



Adult female (PL XIII, fig. 12) pyriform, very 

 widely rounded in front, and somewhat suddenly at- 

 tenuated behind. Segmentation not very pronounced ; 

 margin of the three free abdominal segments broadly 

 set with short tubular spinnerets, of a similar charac- 

 ter to those of the pygidium. Rudimentary antennae 

 with a long and much curved spine. Par astigmatic 

 glands, about six in number, present with the anterior 

 spiracles only. 



Pygidium (PL XVI, fig. 3) has five groups of cir- 

 cumgenital glands ; the anterior group consists of from 

 9 15 ; the anterior laterals 12 23 ; and the posterior 

 laterals from 10 24. Formula of fifteen examples : 



9 9 12 12 12 15 



1512 1218 1917 19-19 1415 2023 

 1211 1517 1112 1210 1924 1213 



13 9 9 13 9 9 



1814 2221 1921 1814 2221 1921 

 1410' 1813 1713 1412 1813 1713 



11 12 13 



2318 1820 2018 

 15_15 1615 1513 



* Vice opuntix, Ent. Mo. Mag., 1893, p. 188. 



