Hale — Aquatic Hemiptera 319 



angles as medial length, with comparatively large, crowded punctures, almost 

 confluent; anterior margin mediaiily incised; posterior margin angularly convex; 

 lateral margins short, oblicpie; angles subacute. Hemelytra dark olivaceous- 

 brown, paler basally ; with closely-set punctures as on pronotum, but with longer 

 black hairs ; clavus with a short, dark streak near lateral basal angle, sub-parallel 

 with the suture, and a dark marking at tlie inner and apical angles ; claval suture 

 narrowly margined with black; coriuni darkened at angles and opposite the 

 termination of* the embolium, which is pale. Sternum ochraceous; underside of 

 abdomen black anteriorly, testaceous posteriorly, clothed with a very line, pale 

 pubescence; connexivum testaceous; strigil very small, roundly sub-quadrate, 

 with four broad rows of striae; legs ochraceous, tibiae and tarsi more or less 

 darkened ; anterior tibiae about half as long as the palae, which are falcate, 

 evenly rounded above, narrower at the base ; claw strong, the inner edge serrate ; 

 a single row of about twenty-three stridulatory pegs, following the curve of the 

 lower margin and extending from the apex to three-fourths of the length ; apical 

 pegs long, acute, the remainder sub-oval, pointed; intermediate claw\s as long as, 

 or a little longer than the tarsi, which are little more than half the length of the 

 tibiae; first joint of posterior tarsi as long as the tibiae; swimming hairs black. 

 Length, 8u mm. to 9 mm. 



9 Interocular carina, and punctures on head and face, as in male; the 

 slightly depressed area on the face is somewhat raised centrally; face testaceous, 

 with yellow .hairs. Underside of abdomen testaceous, posterior segments some- 

 times darkened; palae relatively longer, but more slender, than in male; claw 

 apparently not serrate. Length, 9 mm. 



Uab. South Australia: Adelaide (J. G. 0. Tepper and H. M. Hale), Murray 

 River and Bordertown (J. G. 0. Tepper), Blakiston (Driffield); Queensland: 

 Townsville (F. P. Dodd) ; New South Wales: Mittagong and Clarence River 

 (A. M. Lea); Victoria: (Blackburn), Plenty River (Searle), Mallee (National 

 Museum, and O. Uonohue). 



It is with some doubt that specimens from the above localities are referred 

 to this species. The author describes the hemelytra as "paler at the base (owing 

 to absence of punctuation)"; in examples now identified the punctures extend 

 over the Avhole of the wing-covers, excepting the very small, dull, blackish portion 

 which is covered by the pronotum. Both sexes have a longitudinal, median carina 

 on the head, a character assigned only to the female iii the original description ; 

 the facial impression of the male does not extend "almost to the vertex," and the 

 clothing is dark. The type is from Adelaide River, Northern Territory (British 

 Museiim). 



