OF NEW ZEALAND. 843 



Group-MELANDRYID^. 



Onysius. 



Nov. gen. 

 Head nearly as broad as thorax, epistome porrect, truncate in 

 front ; labritm transverse, prominent, with an almost straight edge, 

 covering the mandibles ; eyes large, reniform, with coarse facets ; 

 maxillary palpi hirsute, robust, basal joints minute, second elongate- 

 triangular, third short, obconical, fourth as large as second, elongate- 

 securiform ; labial short and stout, their terminal joint obtuse, 

 arched; mentum large, obliquely truncated towards the middle, 

 which, however, is straight ; mandibles robust, externally curved, 

 acutely bifid at apex. Antenna inserted before the emargination of 

 the eyes, extending backwards to the middle of the elytra ; stout, 

 not at all moniliform, basal joint short, swollen, sub-triangular, 

 second rather longer but more slender, joints 3-8 about equal, 

 thickened apically, each longer than second, ninth and tenth also 

 eleventh somewhat flattened, a little longer and broader than the 

 preceding, eleventh as large as tenth, oviform. Prothorax quadrate, 

 apex trisinuate, anterior angles obtusely prominent, yet not reaching 

 as far forward as the middle portion of the apex ; base medially 

 incurved; widest and somewhat rounded laterally in front, from 

 thence nearly straight to the obtuse hind angles, finely marginated 

 throughout, depressed. Scutellum large, curvilinearly triangular. 

 Elytra oblong, nearly twice the breadth and four times the length 

 of the thorax, their sides nearly vertical, posterior slope gradual ; 

 parallel to beyond the middle, from thence the margins are gradually 

 explanated, abruptly sinuously narrowed posteriorly, apices simple, 

 rounded, disc nearly plane but uneven. Legs moderate, femora a 

 little inflated ; tibice nearly straight, gradually and slightly thickened, 

 and minutely bi-calcarate at apex ; tarsi elongate, quite as long as 

 the tibiae, with simple soles, two front pairs pentamerous, narrow, 

 their joints entire and of equal width, the three basal of the same 

 length, fourth shorter than third, sunple, fifth longest, posterior 

 quadri-articulate, decreasing in length, fourth, however, rather longer 

 than first; claws well developed, simple. Prostermcm short, simple; 

 cox(2 globose-cylindric, prominent, narrowly separated. Mesosternum 

 short, with a plane, broad, triangular process slightly projecting 

 anteriorly and adapted to the slight prosternal notch, coxae a little 

 further apart than the anterior, moderately raised, rounded. Mcta- 

 sterniim moderate, episterna broad, narrowed posteriorly, hind coxae 

 embedded, transverse, more widely separated than the others. Coty- 

 loid cavities closed. Abdomen with five nearly equal segments; 

 inter-coxal process broadly triangular, with carinate edges. Eiji- 

 pleura narrow. 



1499. O. anomalus, n.s. Sub-oblong, sub-depressed, nearly 

 nude, shining, uneven ; head and thorax infuscate-red, the sides 

 of the latter suffused with pitchy -brown : elytra testaceous, the 

 scutellar region rufescent, and with two shining, blackish, arrow- 

 shaped discoidal marks, on other parts indistinctly tinged with green 



