186 SIR J. LTJBBOCK ON ANTS, BEES, AND WASPS. 



descended one from the other ; and it seems incredible that the 

 modification has originated independently in the two species. 



It is interesting that, although these specimens apparently 

 never leave the nest, and have little use therefore for legs, man- 

 dibles, &c, the modifications which they have undergone seem 

 almost confined to the abdominal portion of the digestive organs. 

 The head and thorax, antennae, jaws, legs, &c. differ but little 

 from those of ordinary ants. 



Camponotus inplatus, n. sp. (Plate VIII.) 



Operaria. Long. 15 mill. Nigra, tarsis pallidioribus ; subtiliter co- 

 riacea, setis cinereo-testaceis sparsis ; antennis tibiisque haud pilosis ; 

 tarsis infra hirsutis; mandibulis punctatis, hirsutis, sexdentatis; clypeo 

 non carinato, antice integro ; petioli squama modice incrassata, antice con- 

 vexa, postice plana emarginata. 



Hab. Australiam? 



The colour is black, the feet being somewhat paler. The body 

 is sparsely covered with stiff cinereo-testaceous hairs, especially 

 on the lower and anterior part of the head, the mandibles, and 

 the posterior edge of the thorax. The head and thorax are finely 

 coriaceous. 



The antennae are of moderate length, twelve-jointed ; the scape 

 about one third as long as the terminal portion and somewhat 

 bent. At the apex of the scape are a few short spines, bifurcated 

 at the point. At the apex of each of the succeeding segments 

 are a few much less conspicuous spines, which decrease in size 

 from the basal segments outwards. The antenna is also thickly 

 clothed with short hairs, and especially towards the apex with 

 leaf-shaped sense-hairs. The clypeus is rounded, with a slightly 

 developed median lobe and a row of stiff hairs round the anterior 

 border ; it is not carinated. 



The mandibles have six teeth, those on one side (fig. 3) being 

 rather more developed and more pointed than those on the 

 other. They decrease pretty regularly from the outside inwards. 



The maxilla? (fig. 5) are formed on the usual type. The max- 

 illary palpi are six-jointed, the third segment being but slightly 

 longer than the second, fourth, or fifth ; while in Myrmecocystus 

 the third and fourth are greatly elongated. The segments of the 

 palpi have on the inner side a number of curious curved blunt 

 hairs besides the usual shorter ones. 



The labial palpi are four -jointed (fig. 4). The eyes are elliptical 

 and of moderate size. The ocelli are not developed. 



