Xvi 
the depth at the apex. The elytra of A. Odewahuii are much smaller than those of 
the other species. In neither do the tibie present any appearance of angularily or 
toothing, but this may be because they are both females. Mr. Du Boulay thinks the 
antenne are flexible, but in this Mr. Bostock does not agree. Referring to the 
species which I have named after him, Mr. Bostock writes as follows:—‘* The first 
caught was found (when disturbed ?) on his back, and two ants at once seized him to 
carry him to a place of safety. . . . . I saw another ona stick protruding from 
an under-ground nest, and as I approached nearer to capture it I plainly saw two 
ants, one on either side, seize it and hurry it down the hole. . . . . The latter 
specimen caught was resting with his body inclined at an angle of about 30°, and 
was bowing his head vertically and his antenne laterally in a most amusing manner.’ 
Mr. Bostock thinks there “is a ‘bag of ant-liquid beneath the fovea’ (cavity on the 
abdomen ?).” 
Mr. Pascoe also exhibited a small collection of Coleoptera from Fremantle, placed 
in his hands by the Rev. Hamlet Clark, to whom it had been sent by the Rev. George 
Bostock. In addition to the species of Articerus above described, the collection 
included Anthicus strictus, £’r., and two probably new species, found in ants’ nests, 
being, as Mr. Pascoe believed, the first instance of an Anthicus occurring in such a 
situation; a beautiful new species of Ptinus, Mezium sulcatum, two new species of 
Hyocis, Scopodes boops, E'r.; two species of Platynotus, one certainly and the other 
probably new; a Cryptophagus, two species of Brachypeplus, a Scymnus, Uloma?, 
Platysoma, &c.; an insect of unknown genus of the size and outline of Corticaria ser- 
raticollis, Duval, but with very peculiar tarsi; and a new Mecynotarsus, of which the 
following diagnosis was read :— 
“ Mecynotarsus albellus, n. sp. 
““M. testaceus, pube densa alba tectus; parte prothoracis protensa breviascula, 
ovata, dentibus quadratis rubris undecim instructa; elytris humeris producto- 
rotundatis; pedibus antennisque testaceis. 
Long. lin. 14. 
Hab.—Fremantle.” 
But the most remarkable insect in the collection was an entirely new form, also 
found in ants’ nests, for which the name of Ectrephes formicarum was proposed, and 
of which the following description was read :— 
““ ECTREPHES, 0. g. 
“ Caput insertum, subtus inclinatum, fronte pro receptione antennarum profunde 
excavata. Oculi parvi, rotundati. Mandibule rostriformes. Antenne tri- 
articulate; articulo basali breviter obconico; secundo minuto; tertio elongato, | 
compresso, apice oblique truncato. Prothorax transversus, utrinque pone apicem 
emarginatus, lateribus carinato-alatis. Elytra breviter ovata, convexa. Femora | 
et tibia compresse ; tarsi 5-articulati, elongati, filiformes. 
“ Hetrephes formicarum, n. sp. 
“ E. ommino fusco-castaneus ; elytris nitidis, pilis minutis erectis valde dispersis. 
Long. lin. 1. 
Hab.—Fremantle. 
