West Australian Coccidm. 453 



On Eucalyptus S'p. This insect is doubly interesting on 

 account of its peculiar structure and the fact that it was 

 found buried to some depth in the living bark. When I 

 first found it I was much struck by this circumstance, and 

 succeeded in obtaining a clue as to how it had "burrowed" 

 into the bark. A search of the higher branches of the tree 

 revealed many longitudinal slits in the fresh bark which, 

 upon examination, were found to extend into the bark in 

 an upward direction ahnost to the wood, and to contain the 

 eggs of some large Homopteron. These slits corresponded 

 exactly in direction with those in the older bark occupied 

 by the Coccids, which they must have taken possession of 

 as larvae. How the young Coccid is able to enlarge the 

 cavity to suit its increasing proportions is rather 

 inexplicable. 



36. Ourococcus casuarinse, sp. n. (PI. XV, figs. 25, 

 25 a, 26.) 



Adult 9 stationary, chestnut-brown, unsegraented, slightly globose, 

 extremely chitinous and hard, hiding beneath the bract-like leaves 

 of Casuarina; accompanied by much fumagine and secreting a single, 

 long, glassy tail. Abdomen tapering slightly and ending in two con- 

 spicuous tubercles, which bear 3 stout spines. The margin of the 

 abdomen bears similar spines to those on the tubercles, and on each 

 side of the terminal tubercles there are usually from 2 — 4 less promi- 

 nent tubercles. There is a central groove in the abdomen similar to 

 that seen in 0. eucalypti and 0. cohbii, and with difficulty a similar 

 form of organ is to be detected. Mentum conical. Antennse very 

 small, atrophied ; 2- or 3-jointed, a few hairs at the apex. Legs 

 absent. Behind the posterior spiracles there are two convex, semi- 

 circular, lobe-like appendages, thickly perforated with circular pores, 

 and having a honeycombed appearance. 



Swan River, W. A. 



37. Ourococcus cobbii, sp. n. (Plate XV, figs. 27, 27 a.) 

 Adult $ s found 'beneath bark scales of Eticalyptus sp. and also in 

 wounds in the bark, secreting long, glassy filaments, stationary. 

 Abdomen chitinous, rounded, ending in two inconspicuous chitinous 

 tubercles, each bearing a small spine. Inside the abdomen is to be 

 seen, after preparation, a reniform organ similar in nature to that 

 seen in 0. eucalypti. Antennae of 7 joints, atrophied, tapering, apex 

 haired. Mentum long, conical, dimerous. Dorsum with spines and 

 compound and short, tubular spinnerets. Upon the margin of some 



