42 EBCORDS OF THE AUSTRALIAN MUSEUM. 



NOTES ON AUSTRALIAN AQUATIC HEMIPTERA. 



(No. 1.) 



By Frederick A. A. Skuse, F.L.S., Entomologist. 



[Plate XI.] 



The following are descriptions of two species of fresh-water 

 Hemiptera, found commonly in the vicinity of Sydney, and 

 which appear to be novelties. As opportunity occurs, the 

 author hopes to supplement them with diagnoses of further 

 species inhabiting the fresh-water creeks and ponds of New- 

 South Wales, and, if possible, of those of the neighbouring 

 colonies : — 



Family HYDROMETRIDiE. 



Genus Hydrometra, Fab. 



HyDROMETRA AUSTRALIS, SJJ. IIOV. 



(Plate xi. fig. 3.) 



Above black or olive-black, shining ; beneath yellowish-grey 

 with a silvery bloom. Head with two longitudinal orange-yellow 

 lines connected on the hind margin, and an orange spot or short 

 line before the eyes. Antennae black ; first joint about one-third 

 the length of the whole taken together. Pronotum parallel, 

 coniform posteriorly, bordered with an orange-yellow line, and 

 with a longitudinal line traversing about one-sixth of its length, 

 and two very short (sometimes indistinct) longitudinal lines 

 anteriorly ; obtusely tuberculated anteriorly. Pleurae and coxae 

 striped or spotted with orange-yellow. Elytra wanting. Abdo- 

 minal segments with a more or less distinct interrupted median 

 orange-yellow line. 



Length. — 8 mm. 



^a6.— Sydney, N.S.W. 



