new Species of Histeride. 427 
Orectoscelis humeralis, sp. n. 
Oblongus, piceus, punctatus ; pronoto antice bituberculato ; elytris 
humeris valdissime prominentibus, striis suturalibus integris, 
exteris nullis; pedibus brevibus, tibiis intermediis et posticis 
latis. 
L. 22 mill. 
Oblong, dorsum somewhat gibbous, piceous, semiopaque 
and coarsely and densely punctate above and below; the 
head is without strie; the thorax somewhat quadrate but 
shghtly widening out to its base, behind the middle of the 
neck are two tuberculate processes which widen out at their 
bases, along the lateral edges the coarse punctures give place 
to small tubercles ; the elytra, there is a sutural stria which 
is continued less conspicuously behind the thorax and along 
the apical margin, on either shoulder there is a large semi- 
circular elevation, not quite perpendicular but leaning out- 
wards, hollow in its centre, with its inner edge densely clothed 
with a very conspicuous, short, flavous pubescence, the upper 
rim is evenly punctulate, punctures relatively fine as com- 
pared with those of the dorsum, the lateral edges are some- 
what tuberculate but less conspicuously so than those of the 
thorax ; the propygidium and pygidium are punctured like 
the dorsum, except on the apical rim of the latter, where 
there are only small points. The prosternum is very feebl 
sinuous at its base, there is a marginal stria which is parallel 
laterally behind the anterior angles as far as the tibial groove, 
and it then follows the outline round the base; the meso- 
sternum is also marginate; the punctuation is similar on all 
the sterna and on the first segment of the abdomen as well 
as on the upper surface. 
Hab. Townsville, Queensland (F. P. Dodd, 16th Decem- 
ber, 1902). One example from an ants’ nest. 
Not much is known of the habits of the curious Australian 
Histerids included in the genus Chlamydopsis. CC. striatella, 
Westw., and C. inquilina, Lew., have been reported as oc- 
curring in ants’ nests, and it is probable that all the species 
are truly formicarious. Blackburn has described four species, 
but his specimens are stated to be unique and appear to 
have been captured fortuitously, two on fences and one in 
a pool of water. ‘here are probably many species yet to be 
discovered. ‘The insects have no special torm, such as the 
cylindricity seen in Z'ryponcus, which at once gives a clue 
to their mode of life; but they seem to have been subjected 
to treer conditions of environment, such as that which [ think 
has given rise to the various forms of Sternocelis (Aun, & 
Mag. Nat. Hist. x. p. 232, 1892). 
