Hale — Aquatic Hemiptera 315 



of head; an impressed line of pnnetnres on eaeli side of carina and another 

 bordering the eye; facial impression obovate, very large and deep, extending- 

 almost to the vertex and laterally nc^arly touching the eyes; eyes directed 

 moderately backwards, beyond and over th(» anterior pronotal angles, inner 



Fig. 341. Arcfocorisa fi iincatipala. 



margins slightly divergent ; fonrth joint of antennae more than half as long as 

 the third (a). Pronotnm black, crossed by six, slightly curved, greenish-yellow 

 lines ; Uvice as broad between hnmeral angles as medial length ; rastrate and with a 

 median carina, most distinct anteriorly; posterior margin angnlarly convex; 

 lateral margins short; angles obtuse. Hemelytra black, marked with yellow, 

 sparsely clothed with long, fine, yellow hairs; clavns finely rastrate, basally with 

 five or six narrow, irregular, obliquely-transverse lines; remainder of wing-covers 

 with many short, angnlarly wavy markings, on the corinm arranged in fonr 

 distinct longitudinal series, the outer series forming an interrupted line bordering 

 the anterior margin, but separated from it by a narrow black interspace ; tip of 

 membrane black; embolium dull, livid. Sternum and legs ochraceous; underside 

 of abdomen testaceous; connexivum ])ale yellow; strigil bro^^^lish black, of com- 

 paratively large size, sub-quadrate in form, with five broad, more or less regular 

 rows of striae; anterior tibiae stout, about four-fifths as long as palae w^hich, 

 viewed from above, are semi-lunate, narroAver at the base; seen sideways they 

 are elongate sub-rectangular, the apex very truncate, as wide as the base and 

 forming a wide angle with the upper and knver edges; base slightly widened; 

 upper edge posteriorly almost straight, a little concave, suddenly convex and bent 

 downwards to the upper apical angle ; lower edge gently concave ; claw^ as long as 

 the width of tarsus; thirty-two stridulatory pegs in a single row sub-parallel with 

 the upper margin, extending from the middle of the base to the upper anterior 

 angle ; apical pegs longest, subulate, the series regularly decreasing in size back- 

 wards, the posterior teeth being stout and sub-oval; intermediate claws about 



