Hale — Aquatic Hemiptera 



423 



peculiar structure called the strigil, upou the right side of the abdomen, without 

 doubt serves a similar purpose." (^) 



The accompanying drawing (fig. 372) shows the apparent function of the 

 large facial impression of Arctocorisa truncatipala during copulation ; the male 

 clasps the female with the short front legs, while the head is bent down so that the 

 foveate face is closely applied to the rounded back of his consort, thus doubtless 

 affording additional assistance in maintaining his position; a bubble of air is 

 trapped in the space between the head and the prothorax. 



POROCORIXA HIRTIFRONS Hale. 



Included in a batch of Corixids recently collected by Mr. F. W. Shepherd 

 at Broken Hill, New South Wales, is a good series of Porocorixa hirtifrons, pre- 

 viously known only from a few. more or less damaged specimens ; this locality is, 

 therefore, to be added to the known distribution of the species. 



WM 



Fig. 372. Arctocorisa tru/iicatipala in copula. 



Fig. 373. Porocorixa liirtifrons. 



The following additional notes are from these fresh examples. 



Head pale ochraceous. The sub-elliptical, slightly raised area of the pro- 

 notum pale olivaceous-brown, not extending to the lateral edges; the anterior 

 portion, including a broad lateral margin on each side, pale ochraceous ; posterior 

 edge very narrowly margined with brownish-black. Posterior angle of scutellum 

 exposed, dull, black. Pegs of male palae twenty-three to twenty-seven. Under- 

 side grey, fading to ochraceous after drying. 



(5) Bull. Univ. Kansas, xxi, 1919, p. 229. 



