470 Mr. David Sharp's revision of the 



punctate. Elytra coarsely punctate, and with very distinct series 

 of punctures. 



Greymouth {Helms, No. 46). I have only two examples, 

 both in bad preservation. 



Eygmodus. 

 Rygmodus, White, Voy. Er. and Ter. Ins. ; Broun, 

 Man, N. Z. Col., p. 79. 



The important characters of this genus are the 9- 

 jointed antennae, joints 4 to 6 being moderately large, 

 and the elongate laxly articulated club ; the maxillary 

 palpi being rather short, with the three outer joints 

 equal in length ; the jDrominent eyes ; unarmed meso- 

 sternum, with the middle coxae almost contiguous ; the 

 legs elongate and slender, so that in the natural posi- 

 tion the hind femora extend a little beyond the sides 

 of the wing-cases, the knees being thus visible from 

 above ; the pilose tarsi, and above all the claws furnished 

 beneath with an elongate lobe ; to which may be added 

 that the elytra are of shining blue or metallic-colour. 

 The basal joint of the hind tarsus is short, only one- 

 third or one-fourth of the length of the following, with 

 which, when viewed externally, it is so closely connected 

 that the division between them is not very perceptible, 

 and it was probably this that caused White to place the 

 genus in the Heteromera. There is no doubt, however, 

 that it belongs to the Hydrohiini ; with the ordinary forms 

 of which — such as Anaccena — it is closely connected by 

 means of Saphydrus, although the long slender legs and 

 the bright metallic colour of the upper surface give 

 these insects an appearance foreign to the tribe to which 

 they belong. These peculiarities are quite accounted for 

 by the fact that the Rygmodi are not — in the perfect 

 state, at any rate — aquatic in their habits, but frequent 

 the foliage of plants. Broun has described several 

 supposed new species of the genus, one of which — 

 R. ohlongiis — is probably a Sajyhydrus ; and as to the 

 others, his descriptions do not enable me to decide 

 whether they are distinct from li. modcstus or not. 



I shall not tabulate the four species known to me, as 

 the brief diagnoses I have given will enable each to be 

 determined with certainty. 



At first sight there seems to be no sexual characters 

 by which exturnally to distinguish the sexes. I have, 



