438 Mr. T. D. A. Cockerell on 



genital glands, median of 11, anterior laterals 18, posterior 

 laterals about 8. 



^ . — Scales obscurely tricarinate, but very fluffy, looking 

 like little fluffy white spots of no particular shape. 



Hah. Cuautla, Mexico, July 25, 1897, on Cherimoya ; 

 also Cuautla, Sept. 27, 1897, on " Zapote " {Koebele, 1658). 

 Div. Ent. 7890. Also Orizaba, July 19, 1897, on " Zapote" (?) 

 {Koebele, 1736). Div. Ent. 7944. 



The scales occur upon the leaves. Very distinct by the 

 black female scale &c. 



Mytilaspis mexicana, sp. n. 



$ . — Scale pale brown, dull, flat, so broad as to be almost 

 circular, the pointed basal end sometimes curved to one side. 

 Diam. 3 millim., length 3^ millim. Exuviaj brown, of a 

 darker tint than the scale, second skin covered. 



? . — After boiling colourless, the caudal portion strongly 

 striated longitudinally, and suffused with yellow. Median 

 lobes large, a sliort distance apart, the inner margins paraUcl, 

 the apex rounded, the outer declivity long and twice notched ; 

 second lobes small, completely divided into two lobules, of 

 which the outer is the smaller ; third lobe similar, but only 

 one distinct lobule ; beyond the third lobe are three broad 

 serrated eminences, representing rudimentary lobes ; plates 

 spine-like, stout, and rather long; many transversely linear 

 dorsal glands; some structures like the interlobular thickenings 

 of Diaspidiotus, but below instead of between the lobes. 

 Five groups of circumgenital glands, median of 18 to 25, 

 anterior laterals about 27 to 33, posterior laterals 25 to 35. 



^ . — Scale elongate, of the form usual in the genus. 



JIab. Cuautla, Mexico, on "Nettle-tree," July 2, 1897 

 {Koebele, 1724). Div. Ent. 1763. Also collected by Koebele 

 at Cuautla on " Dragon's Blood " (?) and on roots of FicuSj 

 sp. (?), many of the last-mentioned lot being parasitized. 



The form and appearance of the scale at once distinguish 

 this from all other American forms. 



In the collection are also specimens of Mytilaspis (subg. 

 Opuntiaspis, Ckll., MS.) philococcus, Ckll., marked *' On 

 cactus, Mexico, Aug. 2, 1897" {Koebele, 1695). Div. Eut. 

 5860. 



Aspidiotus iPseudodiaspis) dentilobis, sp. n. 



$ . — Scale oval, about 2^ millim. long, convex, with the 

 exuviaj lateral but within the marginal limits, at one end ; 

 colour of scale black, with more or less greyish and whitish 



