109 



Food-plants. — The species of Citrus, and also Murray a. On June 25 r 

 1892, Mr. 0. B. Taylor brought me a twig of Murraya gathered 

 in Kingston, with M. citracola and Aspidiotus articulatus upon it. 

 Mr. Maskell reports it also from Croton and Banksia integrifolia. 

 Green records it from Cocculus indicus, but probably the record re- 

 lates to a distinct species, which he has since named M. cocculi. 

 Mr. A. 0. F. Morgan has expressed the opinion that Mytilaspis 

 pinnae/ 'ormis of Bouche, found on Cymbidium, is identical with M. 

 citricola, but the identity is very doubtful. 



Destructiveness. — Quite injurious when abundant. 



Parasites. — It is attacked by an undetermined hymenopterous parasite 

 in Antigna. In Florida it has three parasites, Aphycus flavut, 

 Howard, Prospalta amantii, Howard, and Signiphora flavopalliata, 

 Ashmead. 



Note. — Mytilaspis gloveri is another scale of Citrus trees found in 

 Southern Europe, the Southern United States, &c. ; it is known at 

 once by its very narrow scale. It is curious that it does not occur 

 in the West Indies ; while at Tampico, Mexico, Prof. Townsend 

 found it abundant, but no M. citricola. 



(66.) Mytilaspis crolonis, Ckll. — -(The croton Mussel scale.) 



Diagnosis. — Small curled mussel-shaped scales on twigs of croton, so 

 exactly the colour of the bark that they are very hard to detect, 

 even when abundant. 



Distribution. — Only known from Kingston, Jamaica, where it was dis- 

 covered by Mr. J. J. Bowrey. 



Food-plant. — A variegated croton with narrow leaves. 



Destructiveness — It must be quite injurious, but it seems to be little 

 distributed at present. 



Parasites. — It has an undetermined parasite ; a bright orange mite is 

 also found praying upon the larvae. 



(67.) Mytilaspis alba, Ckll— (The White Mussel scale.) 



Diagnosis. — This differs from the other West Indian species of the 

 genus by its white scale. — It could be taken for a Chionaspis, but 

 the male scale is not keeled ; it is linear, greyish-white, with the 

 orange larval skin at one end. 



Distribution. — Found in Kingston, Jamaica; a variety (var. concolor) 

 is found in the Mesilla Valley, New Mexico. 



Food-plants. — The typical form on a malvaceous weed with yellow 

 flowers ; the var. concolor on Atriplex canescens. 



Destructiveness. — It is not known to attack any cultivated plant. 



NOTE ON LECANIUM TESSELLATUM. 



A study of material from other localities has brought out the fact 

 that the form found in Jamaica on lignumvitse attributed to L. tessel- 

 latum, is a distinct variety perhaps species. It is larger than the true 

 tessellatum, and differs in various small details, for an account of which 

 see Trans. American Entomological Society, Vol. XX. (1893) p. 51. I 

 propose to call this lignumvitse form var. swainsonw, after Mrs. Swain- 

 son of Bath, who first collected it. — T. D. A. Cockerel!. 



