316 Records of the S.A. Museum 



equal in l('ii<«'th to tarsi; tibiae lonp'or; posterior tibiae sliortei" than tarsi; swim- 

 ming hfiirs dark lirowii. Length, .")<S nnn. to (vT) mm. 



$ More robust than the mah". Head slightly shorter, the frontal marg:in 

 somewhat angularly rounded ; interocular carina (extending below on to the face, 

 which is convex, punctured, and with sjiarse yellow hairs. Pahie much as in 

 the female of A. austral is. Length, .l-S mm. to 7 nnn. 



Ilah. South Australia: Adelaide (type locality, H. M. Hale, A. H. Elston, 

 and Mulvin), Murray River (H. M. Hale), South East (Ziegler), Lucindale 

 (B. A. Feuerheerdt), Myponga (A. H. Elston), Goolwa and Fimiiss River (A. 

 Zietz) ; New South Wales: Sydney (Australian Museum), Bungendore, Clarence 

 River, and Hay (A. M. Lea); Victoria: Melbourne (Searle) ; Tasmania: (A. 

 Simson), Hobart (A. M. Lea). Type, 1. ir)183. 



A. truncaiipala is allied to the preceding species, bnt the form is more robust 

 and the head is scarcely as prominent : the pronotal lines are l)roader and usually 

 in less number, and the hemelytral markings are more broken. Tt may be readily 

 recognized by the form of the male pala, which does not taper to a ]K)int, but 

 terminates in a straight, knife-like edge; this pala is figured as seen sideways 

 and from beneath. Li a large series the following variations oeeur : Six to eight 

 transverse lines on the pronotum, generally regular, I)ut sometimes forked, looped 

 or conjoined; the former number is more usually present. Thirty-two to thirty- 

 five pegs in the palal comb. The intermediate claws vary in length and may be 

 as long as the tibiae. The sternum is sometimes nigrescent and the xyphus and 

 coxae black. 



The species is plentiful in the rivers near Adelaide during the summer. 

 Pupae and immature imagos are of bright lemon colour with very faint markings, 

 w^hich rapidly darken as development proceeds; an orange streak margins the 

 base of the head. The light lines and vermiculations of a living mature example 

 are barely discernible to the naked eye, the bug appearing almost black. 



ARCTOCORISA SUBLAEVIFRONS sp. nov. 



$ Head ochraceous, basally testaceous, about as long as width at ba.se 

 between eyes, rounded and very little produced in front ; with a median, inter- 

 ocular carina, slightly produced at hinder margin of head; an impressed line of 

 punctures on eacli side of the carina and another less distinct series near each 

 eye; face flattened, ])iuictured ; impression hardly discernible, clo.sely punctured, 

 clothed with yellow hairs ; very shallow, short, and narrowly ovate : eyes directed 

 backwards, beyond and over the anterior pronotal angles, the iinier margins a 

 little divergent. Pronotum brownish-black, crossed l)y eight narrow irregular, 



