AQUATIC HETEROPTERA. 



79 



broader than long, about one and a third times as long as pronotum in both 

 sexes. Shape of the anterior tibia and tarsus in both sexes is as shown in the 

 text-fig. 6. Average dimensions : (30 units = 1 mm.). 



Length of body : ^ 8 mm., $ 8 mm. 

 Breadtk of body : $1-9 mm., $ 2-1 mm. 

 Breadth of vertex at anterior margin, seen 



from above : o units, $ 9 units. 

 Breadth of synthlipsis : ^ 5 units, $ 5 units. 

 Length of head : ^ 23 units, $ 20 units. 

 Length of pronotum : ^ 33 units, $ 31 units. 

 Anterior femur : ^ 35 units, $ 34 units. 

 Anterior tibia : ^ 44 units, $ 44 units. 

 Anterior tarsus : ^ 27 units, $ 17+10 units. 

 Intermediate femur : ^ 48 units, $ 47 units. 

 Intermediate tibia : ^ 45 units, $ 44 units. 

 Intermediate tarsus : (J 20+14 units, $ 20 



+15 units. 

 Posterior femur : ^ 75 units, $ '''3 units. 

 Posterior tibia : (J 63 units, $ 63 units. 

 Posterior tarsus : 20+25 units, $ 22 + 



25 units. 



Upolu : Mulifanua, type ^, type 6 (^(^, 8 paratypes, 9.xi.l925. 



In general appearance, this species is very similar to Anisops assimilis 

 E. White, of New Zealand, but differs in having a shorter pronotum. The 

 following measurements are taken from the types of Anisops assimilis B. White, 

 which are now preserved in the Perthshire Natural History and Antiquarian 

 Museum, Perth. (30 units = 1 mm.) 



Length of body : 6-5 mm., $ 8 mm. 



Breadth of vertex at the anterior margin seen above : ^11 units, $ 9 units. 



Breadth of synthlipsis : (J 7 units, $ 5 units. 



Length of head : (J 25 units, $ 17 units. 



Length of pronotum : 42 units, $ 33 units. 



Anterior tibia : (J 40 units, $ 30 units. 



Anterior tarsus : ^ 45 units, $ 19+10 units. 



In A. assimilis, the head and pronotum are comparatively much wider 

 in the than in the but there is apparently no distinct sexual difference in 

 the ratio between the breadth of the anterior margin of the vertex and the 

 synthlipsis, as in J., leucothea : the ratios are as follows : 



A. assimilis ; (J 11 : 7, $ 9 : 5. ' A. leucothea : (J 7 : 5, $ 9 : 5. 



11. 2 3 



Text-fig. 6. — Anisops leucothea Esaki, sp. n. 

 a, anterior tibia and tarsus of (J ; h, the 

 same of 2. 



