286 Transactions. — Zoology. 



junction of anterior and outer borders ; lip truncated, rather longer than 

 broad, dark red brown. 



Sternum oval, pale and brown. 



Abdomen a long oval, pointed posteriorly, down the centre runs a reddish 

 toothed band containing a sooty longitudinal mark vandyked or formed by 

 confluent lozenges, on either side of the reddish band a sooty stripe bordered 

 by pale yellowish white hairs. Under surface pale yellowish, with three 

 longitudinal dark lines. 



Riccarton bush ; on shrubs. 



7. Salticus albobarbatus, n.s. Fig. 8. 



Length of mature male, '25 inch. 



Cephalo-thorax oblong, sloping forwards anteriorly, sloping away abruptly 

 posteriorly j sides very slightly convex, glossy black, slightly iridescent, and 

 sparsely clothed with coarsish black hairs. 



Eyes, three rows ; anterior middle pair far the largest, eyes of second row 

 very small midway between anterior and posterior rows. Beneath the 

 anterior row of eyes is a remarkable beard-like growth of pure white hair, 

 converging from the sides towards the middle line, and contrasting strongly 

 with the glossy black which is the prevailing colour of the spider ; this 

 beard nearly conceals the falces. 



Abdomen ovoid, rather pointed posteriorly. Colour glossy black. 



Legs, 4, 3, 1, 2 ; not very robust ; black, becoming brownish towards 

 distal segments. A black scopula terminates the tarsi ; all the legs are 

 sparsely clothed with black and whitish hairs. 



Having only dried male specimens I am unable to give further particulars 

 with accuracy. 



Habitat, shingle slides. Castle Hill ; collected by J. D. Enys, Esq. 



Art. XXXIT. — Notes on the Stridulating Organs of the Cicada. 



By Ll. Powell, M.D. 



(With Illustrations.) 



{Bead before the Philosophical Institute of Canterbury, \st May, 1872.] 



At page 351 of "The Descent of Man" (1871) I find the following state- 

 ment : — *' The Cicadid(E usually sing during the day, whilst the Fulgoridce 

 appear to be night-songsters. The sound, according to Landois, who has 

 recently studied the subject, is produced by the vibration of the lips of the 

 spiracles which are set into motion by a current of air emitted from the 

 tracheae. It is increased by a wonderfully complex resounding apparatus, 



