- 3 - 



together subequal to abdomen. Pronotum with fairly straight lateral 

 margins. Total length of body (from apex of head to apex of abdomen) 

 " 5 / 7 ths ionger than intermediate femur. The proportions of the legs are 

 as follows: 



fenmr tibia 



Anterior 90 SO 



Intermediate ... 210 195 



Posterior .... 190 135 



Venter obsoletely carinate. - 9 Anterior femora almost straight; api- 

 cai margin of 6 th abdominal segment gently sinuate [fig. 9J. - Length 

 of body 11-9 mill., max. width 4 6 mill. 



San Lorenzo. 



Furnished with yellowish pubescence. 



Head blackish-ferni2Ìneous, base and lateral margins flavous. Thorax 

 with brownish-black lateral band. Anterior lobe of pronotum blackish- 

 ferrugineous, margins and centrai stripe flavous. Metanotum and posterior 

 lobe of pronotum ferrugineous, a large blackish triangular blotch at the 

 apex of the former, in the middle. Metanotum and abdomen blackish- 

 brown with a wide ferrugineous longitudinal stripe, somewhat indistinct 

 011 metanotum and base of abdomen. Genital segments and exterior 

 margins of connexivum ferrugineous. Antennae and legs ferrugineous, 

 infuscate at apices. Entire ventral surface (except black apical segment 

 of rostrum) pallid luteous. 



This may possibly he the 9 of Gerris Perseus Kirk., but though the 

 curvedness and dilation of the anterior femora, in the latter, are prò- 

 bably sexual characters, the general contour of the body is so different 

 that I bave hesitated to unite them without actual proof of their conspe- 

 cificity (*). 



5. Corixa forcieeps Spin., Berg. 



Paraguay - Rio Apa, Alto Paraguay; Argentine -Buenos Aires 99 only. 



6. Corixa denseconserlpta Bredd. 



1897 Hamburger Magali). Sammelreise — Hemipt., p. 16, fìg. 7, 7 a_b . 

 cTy Paraguay — Asuncion , Argentine — Tucuman, San Pablo. 

 As Breddin was acquainted with a single 9 only, the following cha- 

 racters are added. 

 Belongs to subgenus Basileocorixa Kirk. 



(*) Since the above was in proof, D.r Rerg has sent me, with his usuai kind- 

 ness, specimens of his recently described Brachi/metra fuscinervis (1898 

 Comun. Mus. Nac. Buenos Aires. I, p. 3) <$ and 9, which appear to me to be 

 identical with rny Gerris Perseus and G. Andromeda, upon a superflcial 

 -examination. 



