210 PROCEEDINGS OF THE NATIONAL MUSEUM vol. i09 



Aradacanthia multicalcarata Costa, 1864, from Indonesia. Matsuda 

 and Usinger (1957) reported nine species of Calisius from Micronesia. 



The most important characters separating CaHsiinae from other 

 subfamilies are the presence of tergum viii in the males as well as 

 the females; the scutellum covering most of the hemelytra, with 

 correlated reduction of the corium and its venation ; and the presence 

 of a double row of tubercles or teeth on the outer margin of the 

 abdomen. 



Calisiinae includes only three genera: Calisius Stal, 1860, Arada- 

 canthia Costa, 1864, and Calisiopsis Champion, 1898. The first 

 genus had 33 species scattered all over the world, one of them fossil. 

 The latter two were monotypic, Aradacanthia known from the Orient, 

 and Calisiopsis from Central America. 



In this paper are described six new species of the genus Calisius 

 (four American and two Australian) and two new species of the genus 

 Calisiopsis (one from southeastern Brazil and one from Mexico). 



Key to the genera of the subfamily Calisiinae 



1. Body very broad, abdomen almost discoidal; pronotum with each lateral 



border deeply emarginate in the middle, forming four (2+2) rounded and 

 densely denticulated lobes; stridulatory mechanism present. 



Aradacanthia Costa 



Body elongately ovate or ovate, abdomen never discoidal; lateral borders of 



the pronotum at most slightly emarginate, or almost straight, without lobes; 



stridulatory mechanism absent 2 



2. Anterior process of the head more robust; antenna normal, generally with the 



segments increasing in length from the first to fourth; hypop.vgium of the 

 males big, dorsocaudal or caudal in position, clearly visible from above. 



Calisius St&l 

 Anterior process of the head relatively narrower and more protruding; the 

 first three antennal segments very short, moniliform, the fourth as long, 

 or almost as long, as the first three together, and granulated; hypopygium of 

 the male flat, displaced on the ventral surface, and removed from the hind 

 border, not visible from above Calisiopsis Champion 



As already mentioned, Calisiinae differs from other subfamilies by 

 torgum VIII being present not onl}^ in the females, but also in the males. 



In Calisius St§,l, tergum viii of the male is a transverse, short scle- 

 rite, placed behind and a little lower than tergum vii and before the 

 iiypopj^gium (fig. 1). 



In Calisiopsis Champion, tergum viii is produced posteriorly in a 

 curious process having the form of an inverted gutter; its borders 

 are almost closed posteriorly, thus forming a tube (fig. 2). This 

 process serves as a sheath for the pointed tip of the male organ. 

 The lateral parts of tergum viii are bent on the ventral side of the 

 abdomen posteriorly along the split of the process, resulting in the 



