754 AUSTRALIAN AND TASMANIAN PSELAPHID^, 



Tyraphus major Sharp. 



There are before me three of each sex of a species that agrees 

 well with the description of this species. But one specimen was 

 before Sharp, and he considered it a male, although stating that 

 the " metasternum and hind body are not impressed." The type, 

 however, was a female. The male differs in having a distinct 

 tubercle on the middle of the undersurface of the large abdominal 

 segment; seen directly from above, this tubercle appears as a 

 short carina, but from the sides it appears subtriangular. 



Hah. — W. Australia : Vasse (in fiood-debris). 



Ctenisophus noctivagus, n.sp. 



1^. Pale reddish-castaneous, appendages somewhat paler. Moder- 

 ately clothed with pale, scale-like setae, denser at apex of elytra 

 and on the basal segments of abdomen than elsewhere. 



Head with two very shallow fovete between eyes. Antennae 

 rather long, first joint as long as second, but from some directions 

 apparently shorter, second stouter and slightly longer than third, 

 third to seventh small and subequal, eighth to eleventh about 

 three-fifths the total length of antennae, eighth cylindrical, dis- 

 tinctly longer than ninth or tenth, these subequal inter se, eleventh 

 elongate-elliptic, slightly longer than ninth and £enth combined. 

 Three apical joints of palpi each with a long, thin, appendage. 

 Prothorax lightly transverse, widest near apex, thence very feebly 

 decreasing in width to base; with a large but rather shallow sub- 

 basal fovea. Elytra each with a distinct sutural stria, and a 

 rather less distinct, and somewhat curved, disoal one. Mela- 

 sternum deeply sulcate. Abdomen with third segment large; its 

 undersurface somewhat flattened (scarcely impressed) in middle. 

 Legs long and thin. Length 1 mm. 



Q. Differs in having shorter antennae, of which the ninth joint 

 is no longer than the eighth, the tenth distinctly longer and 

 stouter than the ninth (but shorter than in the male), and the 

 eleventh joint shorter and stouter than in the male and almost 

 as long as the four preceding joints combined. The third ventral 

 segment is also regularly convex. 



