ARTICULATA. 185 
Burmeister divides the hynchota into tribes and families, as follows : 
Tree (1). Ham. 1, Pediculina. 
Trise (2). am. 2, Coccina. 
Tree (3) Puyropuruimrs. Lam. 3, Aphidina ; 4, Psyllodes. 
Tree (4) Cicavina. Fam. 5, Cicadellina; 6, Membracina ; 7, Pulgo- 
rina ; 8, Stridulantia. , 
Trier (5) Hyprocorrs. Fam. 9, Notonecticc ; 10, Nepini; 11, Galgu- 
lind. 
Tribe (6) Grocorrs. Fam. 12, Hydrodromici ; 18, Riparw ; 14, Leedu- 
vini ; 15, Membranacet ; 16, Caspini ; 17, Lygeodes ; 18, Coreodes ; 19, 
Scutati. 
Westwood, who admits the Homoptera as a distinct order, divides them 
as follows : 
Section 1. Trmera. Fam. 1, Cicadide; 2, Fulgoride ; 3, Cerconda: 
Secrion 2. Drera. Fam. 4, Psyllide ; 5, Aphide ; 6, Aleurodide. 
Srction 3. Monomera. ‘Lam. 7, Coccide. 
The Heteroptera he distributes as follows : 
Srctron 1. Hyprocorisa. Pam. 1, WVotonectide ; 2, Nepide. 
Srction 2. AurocorisaA. Ham. 3, Galgulide ; 4, Acanthude; 5, Hy- 
drometride ; 6, Reduviide ; 1, Cimicide ; 8, Tingide ; 9, Capsidu ; 10, 
Lygwide ; 11, Corecdw ; 12, Scutelleride. 
Fam. 1. Ooccide. The principal genus of this family is Coccus, one of 
which (Coccus cacti, pl. 80, jig. 54a@6) has been named cochineal in 
commerce. This family was named Gallinsectes by Latreille, on account 
of the resemblance which the female bears to galls, neither wings nor 
articulate structure being present, the inert oval or hemispherical body 
being attached during life to the branch of a tree. They affix themselves 
by means of their rostrum, which is inserted so as to reach the sap, and 
their rudimentary feet when these are present. They resemble the lower 
-erustacea in having a retrograde metamorphosis, the larvee being active 
and capable of moving about to select a place upon which to affix them- 
selves. The young remain for some time beneath the dead body of the 
female, which is well adapted for their protection. The males are active 
and winged, and their antenne are longer than in the females. Somé 
genera secrete from the skin a waxen or cottony substance which covers 
the body, and is often blown off by the wind in little flakes. In some 
genera the females are active. 
Some of these insects increase rapidly, and are very hurtful to vegetation. 
Coceus cacti, on account of its beautiful crimson color, is used as a coloring 
material, and is extensively cultivated for this purpose, particularly in 
Mexico, its native country. It has been introduced into the Canary 
islands, Spain, Algeria, and St. Domingo, and it is cultivated in Guatemala 
389 
