Sept. 1898.] TOWNSEND & CoCKERELL : On MEXICAN COCCID.E. 16T 



needs correction. It is craivi which agrees very perfectly with Maskell's 

 description, and maskelli agrees very poorly. A photograph taken by 

 Craw, in San Francisco, of Californian specimens of the two forms side 

 by side, in situ on the branches, shows the differential characters very 

 clearly. /. purchasi has the body covered, usually conspicuously, with 

 a white or yellowish mealy secretion ; the ovisac long, stout and sub- 

 cylindric, the whole form of sac and insect robust; the edges of body 

 with curled cottony filaments often of some length and pronounced, 

 and the long glassy filaments normally present and conspicuous. I. 

 maskelli, on the other hand, has the body usually nearly bare, dark in 

 color ; the ovisac short rounded subconic, being very conspicuously ab- 

 breviated compared with purchasi ; the whole form much less robust, 

 the edges of the body quite destitute of curled cottony filaments, and 

 the long glassy filaments usually inconspicuous. [C. H. T. T.] 



Icerya montserratensis Riley and Howard. 



On leaves of avocado pear, Tampico, Jan. 26, 1897 (Townsend). 

 Div. Ent., No. 4708. Only one adult 9 , but many young. 



Icerya palmeri Riley and Howard. 



One adult 9 , on Coursetia sp., * near Guaymas, Sonora, April 23, 

 1897 (Koebele, 17 14), Div. Ent., No. 7893. This is the first and oniy 

 adult specimen of /. palmeri known. As the specimen is an unique, it 

 was decided not to boil it for a study of the adult 9 anatomical charac- 

 ters. Unfortunately the antennae were broken, so that it is impossible 

 to say whether it possesses 9-jointed or 11 -jointed antennae, and there- 

 fore it can not yet be referred to its proper subgenus. 



Length of scale including ovisac, over 11 mm. Greatest width of body and of 

 ovisac, 5 mm. Width of ovisac at extremity, 4 mm. Height of insect, 4 mm.; of 

 ovisac, 4^2 mm. 



Adult O • Body red ; legs and antenna; black, covered as well as venter with a 

 white mealy secretion. Edge of body with moderately long curled filaments of white 

 secretion, a central dorsal patch of filamentous secretion being variegated with pale 

 sulphur-yellow. No glassy filaments on body apparently. 



Ovisac pure white, not fluted, presenting a smooth lime-like surface, large and 

 stout, 8 mm. long below and 7 mm. above. The species resembles rileyi in its 

 smooth unfluted ovisac. 



Several larva? extracted from the ovisac demonstrated the fact of this 

 species being palmeri. The median constriction of last antennal joint 

 of first larval stage is pronounced and seems a constant character. The 



*The name was spelled Cocersilia on label. Presumably Coursetia was in- 

 tended. 



