SILPHIDAE. 387 
Zenocolon gen. nov. 
Compact, convex, oblong- oval. Maxillary palpi with slender basal 
articulations ; 3rd short, transverse; 4th large, nearly straight outside, on 
the inside strongly curved and dilated near the base, curvedly narrowed 
towards the extremity, which has a minute terminal appendage. Tarsi 
pentamerous, rather slender, without any dilatation of their joints. 
Prosternum deeply emarginate in front, concave at the sides, with pro- 
minent, contiguous coxae. Intermediate coxae embedded, separated by 
the mesosternal carina, which is broader, concave, and subvertical in front. 
Abdomen with 6 distinct segments, the basal longer than the 2nd, the last 
rounded behind. 
This genus should be located: between Camiarus and Choleva. The 
peculiar shape of the terminal joint of the maxillary palpi, neither oval 
nor securiform, is one of its chief characteristics. 
3840. Zenocolon laevicollis sp. nov. 
Nitid, light castaneo-rufous, palpi fulvescent ; sparingly clothed with 
slender, suberect, yellow pubescence. 
Head small, a good deal narrowed in front of the small, prominent, 
obliquely oval eyes, which have relatively coarse facets. Thorax closely 
applied to the elytra, truncate at the base, curvedly narrowed anteriorly, 
fully a third broader than long, its sides finely margined, posterior angles 
rectangular and directed slightly backwards, the ae smooth. Scutellum 
triangular. Elytra of the same width as thorax at the base, more than 
twice its length, their sides finely margined, nearly straight as far as the 
hind thighs, gradually narrowed behind; sutural striae rather fine and 
indistinct behind, obsolete elsewhere ; their punctation subseriate, fine, less 
distinct towards the extremity. 
Tibiae moderately slender, nearly straight, intermediate and posterior 
finely bispinose, with fine yellow setae. 
Underside rufescent, its pubescence fine, depressed, and yellowish. 
Antennae almost as long as the head and thorax, 2nd joint as elongate 
as the basal; 3rd shorter, yet rather Jonger than the 4th or 5th, these are 
nearly equal and distinctly longer tnan broad; 6th as long as broad, 
narrowed towards its base; joints 7-11 form an enlarged club, the 8th, 
though very short, being about as broad as the adjacent ones. 
Length, 2mm. ; breadth, 1 mm. 
Moa Basin, Canterbury. A single specimen found by Mr. T. Hall 
amongst decaying leaves on the ground, at a height of about 4,000 ft. 
Group TROGOSITIDAE. 
3841. Grynoma setigera sp. nov. Grynoma Sharp, Man. N.Z Coleopt. 
p. 181. 
Subdepressed, oblong-oval, moderately nitid ; nigrescent, sides of thorax, 
and the elytral margins near the base only, testaceous ; clypeus, labrum, 
and basal 2 joints of antennae rufo-testaceous, remaining joints and the 
legs fuscous ; there is scarcely any depressed white pubescence, the surface 
being almost entirely, yet thinly, clothed with erect, elongate and slender, 
ashy setae. 
Head almost as broad as front of thorax, indistinctly and closely punc- 
tate. Thorax twice as broad as long, apex subtruncate, its obtuse angles 
