ARADIDAE — KORMILEV 211 



displacement of the hypopygium toward the ventral surface well 

 removed from the hind margin of the abdomen ; sternum viii is moved 

 further forward, its lobes (genital lobes) are placed on each side of 

 the flattened hypopygium as slender, long spurs projecting far beyond 

 the hind border of the latter, but still not visible from above. 



In Aradacanthia Costa, tergum viii has the form of a small, sub- 

 triangular, apically rounded lobe, placed behind and slightly lower 

 than tergum vii, and serves as a cover for the excavated upper sur- 

 face of the hypopygium (fig. 3). The hypopygium is caudal in 

 position, rather small in comparison with that of the genus Calisius, 

 and subpyriform in shape. Sternum viii is crescent-shaped; its lobes 

 are big, flat, apicaUy bilobate, and the spiracle is placed between 

 the lobes so that the tip of the genital lobes looks tricuspidate. 

 Antenna of Aradacanthia with the fu-st two segments short, and 

 apical two longer, proportions being 8:5:12:14; the fourth segment 

 granulated as in Calisiopsis. 



Calisiinae are very rare, many of the species known only from a 

 single, or very few specimens; this has no doubt contributed to the 

 lack of a clear understanding of the relationship of Calisiinae to the 

 other subfamilies of Aradidae. 



Genus Calisius Stdl, 1858 



Calisius St&l, 1858, K. Vet. Akad. Handl., Stockholm, vol. 2, no. 7, pp. 1-84. 

 Aradosyrtis Costa, 1864, Ann. Mus. Zool. Univ. Napoli, vol. 2, p. 132. 



Type of genus: Calisius pallipes Stal, 1858, by monotypy. 



Calisius is represented in America by 13 species, of which four are 

 here described. Distribution is tropical or subtropical; from Florida 

 to northern Ai'gentina (Tucuman). 



Calisius gracilis, new species 



Figures 4, 5 



Male: Head (fig. 4) shorter than wide through the eyes (35:38); 

 anterior process (tylus and juga together) strong, parallel, anteriorly 

 rounded, and without any notch, densely covered with erect, blunt 

 tubercles; apex attaining the tip of the 3d antennal segment. Anten- 

 niferous spines short, dentiform, scarcely reaching the tip of the 1st 

 antennal segment. Eyes semiglobose. Postocular spines each small, 

 dentiform, slightly projecting beyond the outer margin of the eye. 

 Infraocular carinae formed by a row of blunt, erect tubercles. Vertex 

 with V-shaped row of blunt tubercles; the space between them covered 

 with smaller granulation. Antenna short and slender; the 1st joint 

 ovate, the 2d subglobular, the 3d tapering toward the base, the 4th 

 fusiform; the proportions are (1 to 4): 6:3:8:10. Rostral groove 



