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The leaf-tier Pachyzancla perinda lis Walk. . was present in the field, 
"but was more injurious to a number of experimental plants grown in the green- 
house throughout the year. 
Larvae of the greenhouse leaf-tier ( Phlyc taenia rubigalis Guen. ) were 
observed doing considerable damage to the foliage of string beans in January 
and February. 
The tobacco leaf miner (Gralag re-sSrcm a o-oerculella Zell.) did considerable 
damage, more than usual, due to unusually dry weather around Comerio and 
Caguas, and also in one field near Rio Fiedras during February, March, and 
April. 
The citrus rust mite ( Fhylloco-ptes oleivorus Ashm. ) was apparently not 
so injurious on the whole as during the -orevions year on citrus. 
The pineapple mealybug ( Pseudococcus brevi-pes Ckll.) (Det. Morrison), 
has been generally present but apparently neither common nor injurious. 
This (according to specimens determined by Dr. Morrison, from Dr. 7olcott) 
is not P. citri Pdsso, but is what *as listed in ^olcott < s "Insectae Por- 
toricensis," p. 2S1, as P. bromeliae Bouche. 
Tli e hemispherical scale ( Sals ^-A: tjg h emi s-ohaej;ica Targ. ) (H. Morrison det.^. 
was reported as infesting all the fruits on one/?ree at Juana Diaz, March 13, 
1931 (Faxon and Mills). The homi spherical scale, Saissetia hemisnha erica 
Targ. , was reported abundant and causing considerable sooty mould on coffee 
trees at Guayanilla during April. The hemispherical scale was found to be 
lightly infesting a 1-acre planting of okra at Trujillo Alto on March 27 
(E. Faxon and A. S. Mills; H. Morrison det.). 
The onion thrir>s (Thrros t abaci Lind. ) was present as usual wherever 
onions are grown and often very injurious, more so of course where control 
measures were not well carried out and in the drier sections and periods. 
An adult of the bug Thyanta perditpr Fab. was found feeding on toma- 
to fruit at Corozal February 5, 1931 (A. S. Mills; H. G. Barber det.). 
