822 The Zoologist — August, 1866. 



" Mecynotarsus albellus, n. sp. 

 " M. testaceus, pube densa alba lectus; parte prothoracis protensa breviuscula, 

 ovata, denlibus quadralis lubiis undecim instructa ; elylris humeiis producto- 

 rotundatis; jiedibus aiiiennisque testaceis. 

 Lon». lii). 1^. 

 Hab.— Fieinantle." 



But the most remarkable insect in the collection was an entirely new form, also 

 found in ants' nesls, for which the name of Ectrepbes forraicarum was proposed, and 

 of which the following description was read : — 



" ECTREPHES, n. g. 

 " Caput insertiim, subtus inclinatum, fronte pro receptione antennarum profunde 

 excavata. Oculi parvi, rotundati. MandibuliB rostriformes. Antennae tri- 

 articulatae; artioulo basali breviier obconico; secundo minuto; tertio elongato, 

 compresso, apice oblique truncalo. Proihorax transversus, utrinque pone apicem 

 eraarginatus, lateribus carinato-alatis. Elytra breviier ovata, coiivexa. Femora 

 et tibiae compressa;; tarsi 5-arliculati, elongali, filiformes. 



" L'ctrephes formicarum, n. sp. 



" E. ommino fusco-castaneus ; elylris nitidis, pilis minulis erectis ?alde dispersis. 

 Long. lin. 1. 

 Hab. — Fremantle. 



" The position of Ectrepbes is uncertain ; the fact of the elytra closely embracing 

 and covering the abdomen cuts it off from the Paussidas; in its 3-joinled antenuce it 

 approaches Gnostus, Westw., another isolated genus. The antennae arise from a 

 cavity in front of the bead, and the latter is so bent down that the mandibles almost 

 touch the anterior cox«. The metaslernum is very shorl, and the intermediate and 

 posterior coxae are therefore closely approximate on each side, but widely apart as 

 regards their fellows. The anterior coxae are exsertcd, cylindrical and divergent. 

 The abdominal segments appear to be only four in number, owing probably to the 

 union of the second and third ; counting it as one only, that segment is of large size, 

 whilst the third is reduced to a mere line. I regret that I have not successfully 

 extracted the mouth, but so far as I could judge the mentnin was very small, with two 

 large fusiform palpi; T could not distinguish the maxillary lobes, of which Gnostus 

 has one only, and that very minute. I hope to give a figure of the insect, and to enter 

 into further details on a future occasion." 



Prof Weslwood considered Ectrepbes to belong to the PaussidiE, uotwithstanding 

 that the abdomen was entirely covered by the elytra. 



July 2, 1866. — Sir John Lubbock, Bart., President, in the chair. 



Additions to the Library. 

 The following donations were announced, and thanks voted to the donors; — 

 Hewitson's ' Exotic Butterflies,' Part 59 ; presented by W. W. Saunders, Esq. ' The 



