326 SUPPLEMENT. 
MATHIOLUS, gen. nov. 
Body subovate, flattened. Head with the lateral lobes meeting in front of the central lobe, the margins 
slightly reflexed, obtusely and obscurely toothed on each side in front of the eyes. Pronotum much 
narrower in front than at base. Scutellum attenuated posteriorly. Membrane not quite reaching apex 
of abdomen in male, rudimentary and scarcely extending beyond the corium in the female. Rostrum 
about reaching the posterior coxe. Antenne five-jointed. 
This genus is remarkable for the structural differences between the two sexes, a very 
unusual circumstance in the Pentatomide ; the female also in the typical example is 
much larger in size than the male. 
1. Mathiolus generatus, n. sp. (Tab. XXXI. figg. 43,52.) 
Dark castaneous and rugosely punctate above; legs and rostrum much paler in hue. Antenne with the first 
and second joints shortest and subequal in length, third and fifth joints subequal in length, a little longer 
than the fourth joint. 
Male with the membrane short, not quite covering the apex of abdomen, membranal inner margins straight 
and sometimes not quite meeting. 
Female with the membrane rudimentary, only extending beyond the inner angle of the corium, and leaving 
the last three segments of the abdomen exposed. 
Long. ¢ 84 millim.; 2 10 millim. 
Hab. Guatemata, Cerro Zunil (Champion). 
Four males and one female of this very interesting hemipteron were captured by 
Mr. Champion. The examples of the males are quite constant in size, and we may 
presume that the females are also invariably larger. 
EMPICORIS (p. 48). 
Empicoris ramosa (p. 49). 
To the localities given, add :—MeExico, Chilpancingo, Atoyac in Vera Cruz (H. H. 
Smith). 
MACROPYGIUM (p. 49). 
Macropygium reticulare (p. 49). 
To the localities given, add :—Mexico, Atoyac in Vera Cruz (H. H. Smith), Cuesta 
de Misantla (IZ. Trujillo), Temax in North Yucatan (Gawmer); GuatTemaa, San 
Gerdnimo, San Juan, Senahu (Champion). 
OCHLERUS (p. 50). 
Ochlerus marginatus (p. 50). 
To the localities given, add :—Panama, Bugaba, Volcan de Chiriqui (Champion). 
