764 AUSTRALIAN AND TASMANIAN PSELAPHIDiE, 



striae rather deep and wide, but terminated before middle; punc- 

 tures much less distinct than on prothorax. Upper surface of 

 abdomen with third segment slightly shorter than second, its 

 middle strongly elevated and with a ridge tipped with short and 

 somewhat golden setae, fourth with a large fovea on each side of 

 middle, the middle itself strongly raised, with the elevated part 

 flattened at its apex and tipped with somewhat golden sette; 

 lower surface with third and fourth very short in middle, fifth 

 flattened in middle, and sixth with a large median impression. 

 Metasternum strongly convex; each side of middle with a strongly 

 raised, slightly curved, truncated tubercle, with a minute tubercle 

 half-way between its tip and the hind coxa. Legs long; front 

 trochanters strongly and acutely dentate; femora moderately 

 stout, the middle pair feebly dentate at basal third, the hind pair 

 feebly dentate at the middle; tibiae thin and gently curved. 

 Length 4 mm. 



Hah.—^. S. Wales : Otford(A. M. Lea). 



Readily distinguished from all other described species by 

 its large size(it is, in fact, one of the lai-gest of the Pselaphidce) 

 and remarkable abdomen and pygidium. I have a vague idea 

 that the specimen described was found in a nest of ants, but 

 unfortunately kept no record as to this. 



Tyromorphus quadridentatus, n.sp. 



Bright reddish-castaneous, appendages somewhat paler, but 

 ninth and tenth joints of antennae and abdomen somewhat darker. 

 Sparsely pubescent. 



7/f3ao?(excluding neck) distinctly transverse; with a puncture or 

 very minute fovea close to each eye, and a moderately distinct 

 interantennal depression. Eyes very conspicuous. Antennae 

 moderately long, first joint cylindrical and as long as second to 

 fourth combined, second slightly longer than third, the others to 

 eighth(\vhich is slightly transverse) gradually diminishing in 

 length, ninth and tenth longer and wider, eleventh subovate, as 

 long as eighth to tenth combined. Palpi with first joint stout 

 and short, second rather strongly curved, with apical half inflated, 



