AQUATIC HETEROPTEKA. 



71 



3. Llmnogonus pacificus, sp. n. Text-fig. 2, c, d. 



Very closely allied to Limnogonus fossarum (Fabricius) and its allies, 

 differing only in the structure of the genital segments of both sexes, except that 

 the female is proportionally much stouter in shape than the male. 



The differences in the genital segments of the two species (better shown in 

 text-fig. 2, c, d, e,f) are indicated in the subjoined tabular statement. 



L. pacificus, sp. n. 



Posterior ventral margin of sixth 

 abdominal segment sinuate on each side of 

 middle line (see text-fig. 2, c). 



Posterior ventral margin of first genital 

 segment distinctly pointed in the middle. 



Abdomen and connexiva much broader ; 

 sternite of last abdominal segment much more 

 reflexed dorsally. 



L. fossarum Fabricius. 



(J. Posterior ventral margin of sixth 

 abdominal segment deeply excavated in middle 

 line, thus forming a parabola (text-fig. 2, e). 



[The figure is made from a specimen from 

 Bor Ghat, India. The shape of this sinuation 

 seems variable to some extent, but it is never 

 as in L. pacificus.] 



Posterior ventral margin of first genital 

 segment slightly sinuate, not at all pointed in 

 the middle. Second ventral genital segment 

 broader, lateral margins convergent posteriorly. 



Last abdominal segment less reflexed 

 dorsally, forming three equal teeth seen from 

 venter. 



All the specimens of L. pacificus in the collection are apterous. Pronotum 

 protruded posteriorly, covering a part of mesonotum, as in the apterous form 

 of the allied species. Second and third abdominal tergites in female with 

 bluish-gray pubescence. Antennae similar to those of L. fossarum, the first 

 segment much the longest, the remaining three segments subequal in length : 

 the exact ratio shows a slight variation to some extent. 



Length of body : J 8-0-8-5 mm., $ 8-5-9 mm. ; breadth of body : ^ 2 mm., 

 $ 3 mm. 



Upolu : Malololelei, 2,000 feet, type i., v. 1924 ; Apia, 2 (including 

 type 9), 9.iv.l924, 1 ^ paratype, 25.iv.1924; Mulifanua, 1 2, 17.vii.l925. 



4. Limnogonus buxtoni, sp. n. Text-fig. 3. 



The apterous form is the only one represented in the collection. Males 

 much smaller than females. 



Fusiform. General markings similar to those of the other species of 

 the genus, but the insect is more or less thickly covered with minute golden 



