19 



two species, that they do not occupy all their known food-plants in 

 each locality, though the plants in question may abound. It appears, 

 in fact, that there are different colonies of individuals, differing in 

 food-preferences, though in no ascertainable structural characters. 



Enemies. — A Chalcidid parasite, kindly identified for me by Mr. 

 Howard as belonging to the genus Eupelmus, was bred from some of 

 the scales on pigeon-peas, received from Antigua. 



(16.) Lecanium rubellum, Ckll. (The Little Red Shield-Scale.) 



Diagnosis. — Of the same general form as L. hesperidiun, but smaller, 

 and of a brownish-crimson colour. It might easily be taken for the 

 young of some species. 



Distribution. — Only known from Petersfield, Jamaica, where it was 

 discovered by Mrs. Swainson. 



Food -plant. — Found on the bark of a plant not identified. 



Destructiveness. — Probably not very injurious. 



(17.) Lecanium mangiferw, Green. (The Triangular Shield-Scale.) 

 I Diagnosis. — Greenish, very flat, broad-pyriform or more or less tri- 

 angular. Examined with a microscope, the hairs round the margin 

 are seen to be branched. 



Distribution. — Originally described from Ceylon ; now known from 

 British Guiana and Jamaica. 



Food-Plants. — It is found on leaves of mango, Jambosa, and cin- 

 namon. 



Destructiveness. — Not sufficiently abundant in the West Indies to do 

 much damage. 



(18.) Lecanium tessellation, Sign. (The Tessellated Shield-Scale ) 



Diagnosis. — Somewhat over ^ inch long, very flat, broad-oval in out- 

 line, dark chestnut-brown, shiny. The skin of the back, examined 

 with a lens, is seen to be tessellated. 



Distribution. — Originally found on Caryota in a European hothouse. 

 Mr. Maskell reports it from Australia, and it occurs very rarely on 

 leaves of the lignum- vitae in Kingston, Jamaica. 



Food-plants. — Caryota, lignum-vitse and Lauras. 



Destructiveness. — Not a serious pest. 



Enemies. — A specimen found in Jamaica shows a hole through which 

 a parasite had escaped, but the parasite itself is still unknown. 



(19.) Lecanium assimile var. amaryllidis, Ckll. (The Amarvllis Shield- 

 Scale.) 



Diagnosis. — About \ inch long, oval or oblong in. outline, convex, 

 shiny, black with a pale margin, or brownish. The margin is finely 

 radiately wrinkled. 



Distribution. — Only known from Antigua, where it was discovered 

 by Mr. Barber. It is believed, however, to be a variety of L. assimile, 

 Newst., which was found on Grindelia in England, under circumstances 

 which led to the conclusion that it was not a native of that country. 



Food-plants. — Amaryllis sp. 



Destructiveness. — Probably tolerably harmful in gardens. 

 Enemies. — Several specimens show parasite-holes, but the parasite 

 has not been found. 



Las Cruces, N. Mexico, U. S. A., Nov. 25, 1893. 



