84 MEMIPTERA-HOMOPTERA. 
2. Heteronotus trinodosus. (Tab. VI. figg. 16, 16a, 6, ¢; 17,2.) 
Heteronotus quadrinodosus, Walk. List of Homopt. Ins. ii. p. 592 (nec Fairm.) '. 
Heteronotus trinodosus, Butl. ,Cist. Ent. ii. p. 357, t. 7. fig. 8. 
Hab. Mexico}? (coll. Signoret, in Mus. Vind. Ces.: 3), Atoyac in Vera Cruz [¢ ], 
Teapa in Tabasco [9] (H. H. Smith); GuaTemMata, Panzos in Vera Paz (Champion) ; 
Panama, Volcan de Chiriqui (Champion). 
The insect which I take to be the male of this species is more darkly coloured than 
the female, and has the terminal lobe of the pronotum slightly longer and more oval, 
with the two lateral spines at its apex very small. The males seem scarcer than the 
females, which latter, without exception, have the longer spines. As the insects agree 
closely in all other points, I feel sure that they cannot be regarded as separate species. 
I have not, however, seen the distinction of the sexes given by any author. 
We figure a male specimen from Atoyac and a female from the Volcan de Chiriqui. 
Subfam. TRAGOPINA. 
This subfamily contains two genera only, which are distinguished by having the 
tegmina externally coriaceous and opaque, with the veins of the coriaceous portion 
indistinct and sometimes scarcely distinguishable ; the character of the venation, more- 
over, is peculiar. Stal separates the Darnida and Smiliida from his ‘Tragopida as 
having all the tegmina membranous ; but this is not the case with several of the genera 
which he himself assigns to the two groups (Hem. Afr. p. 83), such as Hntylia, Amas- 
tris, and Oxygonia, which have the external portion of the base of the corium opaque, 
punctured, and more or less coriaceous. In Parmula, and in one or two other genera, 
there are coriaceous patches on the tegmina. Dr. Goding places Parmula under 
the Tragopina (Trans. Am. Ent. Soc. xix. p. 253); but it cannot be separated far 
from Amastris, and Stal (Hem. Fabr. p. 29) includes it rightly under his subfamily 
Smiliuda. | . | 
The genera may be distinguished as follows :— 
I. Tegmina nearly covered by the pronotum ; lateral border of the tegmina very 
broad, occupying about one-third of their surface 
II. Tegmina with their external half free; lateral border of the tegmina moderate, 
not occupying more than one-eighth of their surface . . . . . . . Horiola, Fairm. 
Tragopa, Latr. 
TRAGOPA. 
Tragopa, Latreille, in Cuvier’s Régne Anim. v. p. 219 (1829) ; Germar, Rev. Ent. Silb. iii. p. 545 ; 
Stal, Kong]. Sv. Vet.-Ak. Handl. Band viii. 1, p. 18; Ofv. Vet.-Ak. Forh. xxvi. p. 231 
(1869). 
A considerable number of species have been described from Tropical South America 
