385 



punctured; tibia shortly spinose at apex, the front tibiae bowed 

 and coarsely notched on exterior margin. Dimensions — 

 11-14x6-8 mm. 



Hab. — Western Australia: Cue and Lake Austin (H. 

 Brown). 



Another interesting discovery of Mr. Horace Brown, who 

 has kindly given me four specimens, two of each sex. The 

 males are larger, with the fore tibiae more bent and notched, 

 and have the basal joints of the front tarsi slightly enlarged. 

 The species differs from 0. lateralis, Cart., in its (1) much 

 thinner lateral border of prothorax, with shallower channel 

 inside this border, and wider and less produced angles, (2) 

 much coarser puncturation of head and pronotum, and (3) 

 absence of the fourth elytral costa, inter alia. Type in 

 author's collection. 



Byallius laticollis, n. sp. 



Elongate-ovate; dull black above and beneath, basal joints 

 of antennae and under-sides of legs nitid, tibiae with a line of 

 golden tomentum, tarsi similarly clothed. 



Head — Mandibles bifid, labrum prominent; epistoma 

 truncate in front, angulate with the widely-rounded canthus, 

 its suture arcuate and faintly impressed; forehead convex; 

 whole surface densely and evidently punctate; antennae not 

 reaching base of thorax, joint 3 as long as 4-5 combined, 8-11 

 ovate, opaque, and hirsute, 11 larger than 10. Prothorax 

 5x8 mm., widest behind middle, very slightly convex, arcuate- 

 emarginate at apex; anterior angles widely acute, blunted at 

 apex and outwardly directed; sides feebly sinuate in front, 

 arcuately widening till near base, then rather abruptly but 

 roundly narrowed to the wide obtuse posterior angles; lateral 

 border very thick and round, terminating at the posterior 

 angle behind, much narrowed at apex (appearing there only 

 as a thin reflexed edge) ; lateral channel wide and continuous 

 with the disc, the latter closely and finely punctate, the punc- 

 tures smaller than on head. Scutellum very transverse. Elytra 

 slightly wider than prothorax at base, widest behind middle, 

 somewhat depressed, epipleural fold not evident at shoulders 

 from above, lateral border very narrow, with the usual line of 

 punctures within it ; disc finely reticulate-punctate, a sutural 

 and four other subcostate wavy lines on each elytron, the first 

 two and the last two of the latter connected near apex, the 

 fourth less raised than the rest at the sides. Abdomen and 

 legs strongly punctate, first two segments of the latter strigose, 

 intercoxal process wide, submentum coarsely, prosternum 

 finely, punctate, its process rounded at apex, bordered and 

 sulcate at sides. Dimensions — 19 J x 9 mm. 



N 



