ENEMIES OF THE ORANGE. 259 



It was also abundant on the leaves of Guidia simplex and of 

 the ivy, which were white with their scales, while the young 

 •were also common in December. 



The Orange Bark Louse. — Mr. James Angus has called my 

 attention to a species of Aspidiotus, which is very troublesome 

 in hot-houses about New- York, infesting the leaves of the orange 

 and lemon. He writes me that " during the course of a season, 

 if let alone, they will multiply so as to entirely cover the stem, 

 branches, leaves and fruit, and indeed every part of the tree. I 

 have to scrub every limb, leaf and fruit twice a year, or we 

 would not have a tree worth looking at. I have found them so 

 abundant at the end of the summer that it was folly to attempt 

 to clean the leaves and branches ; hence I was obliged to cut 

 back all the branches to the trunk, (which is more easily man- 

 aged than the leaves,) and bring them into new wood." I 

 have also found the same insect on the skin of oranges imported 

 into Salem, probably from the Mediterranean or the Azores, and 

 am inclined to consider it identical with my Aspidiotus Gloverii, 

 mentioned and figured on page 527 of the " Guide to the Study 

 of Insects." Unfortunately, we have not been able to obtain 

 either the male or female. The scales on the leaves received 

 from Mr. Angus were in most cases remarkably long and linear, 

 straight or curved, some specimens being .20 of an inch in 

 length and only .02 in breadth, while many were wider and 

 shorter, as represented in our figure, Qd (copied into the 

 " Gviide " from Mr. Glover's drawings of individuals observed 

 by him in Florida). They are of a pale reddish color, smooth 

 and shining, witli a yellowish oval scale at the pointed end, with 

 a raised median ridge, and smaller 

 transverse ridges. Some scales are 

 much shorter and broader, and re- 

 sembling the A. conchiformis of our (^^^^^^'^^^ '^^ 

 apple-trees ; such I have found on 

 the skin of imported oranges. Fig. 

 Qa, represents the male ; b, the fe- 

 male ; d, a linear scale enlarged ; while c represents the female 

 of another species, also found on the orange. 



The Fern-Bark Louse. — Another species, found in inconsid- 

 erable numbers on various ferns of the genus Pteris, etc., 

 seems to be identical with the Lecanium of the ferns, the L. 



