259 



of prothorax, with a deep marginal stria from base almost to 

 apex; punctures almost even throughout, and slightly denser 

 than on middle of prothorax. Under- surface with fairly 

 dense, small, sharply-defined punctures, becoming larger and 

 more crowded on parts of prosternum. Front tibiae with a 

 subtriangular tooth near base, separated by a semicircular 

 notch from a larger and more obtuse one at apex ; apex with 

 three processes : an acute and rather short spine at inner 

 apex, an obtuse somewhat curved one close to and almost the 

 length of tarsi, and a subacute and somewhat shorter one 

 between it and the short one. Length, 1*9 mm. 



Hab. — Western Australia: Swan River, from a nest of 

 a large dark species of Ectatomma (J. S. Clark). Type, 

 I. 10681. 



One of the most interesting of the many interesting 

 inquilines recently taken by Mr. Clark. 



Thorictosoma tibiale, n. sp. 

 PI. xxv., fig. 43. 



Castaneous-brown. Glabrous. 



Head much as in preceding species. Prothorax about 

 once and one-half as wide as long, almost semicircularly 

 emarginate in front for reception of head, with a distinct 

 stria from base to apex on each side; punctures small, sharply 

 defined, and almost uniform throughout. Elytra about twice 

 the* median length of prothorax, and almost its exact width at 

 base; with a narrow deep stria on each side from base to apex, 

 and with extremely vague indications of other striae ; punc- 

 tures much as on prothorax. Under -surf ace with somewhat 

 larger punctures than on upper-surface. Front tibiae much 

 as in preceding species, except that there is an additional 

 small process at apex. Length, 2-2*25 mm. 



Hab. — Western Australia: Geraldton (A. M. Lea). 



In general appearance fairly close to the preceding 

 species, but more uniformly coloured, prothorax rather more 

 deeply emarginate in front, with a stria close to each side 

 (there are none on that species), the marginal stria on each 

 elytron deeper, and two conjoined at apex, with vague 

 indications of other striae, and the front tibiae with an 

 additional process at apex. Of the processes on the front 

 tibiae one is short and. acute, one is about the length of the 

 three basal joints of tarsi, one is slightly longer, and the other 

 is longer than the four basal joints combined, somewhat 

 curved and rather blunt. Two specimens, one of which is now 

 headless, were taken in 1896, probably from a nest of ants. 

 j2 



