58 Transactions. — Zoology, 



this the abdominal region proceeds in the form of a slender 

 tapering tube passing up the woody test and terminating in a 

 single point : in fact, the insect has something of the appear- 

 ance of a tadpole. The cephalic region occupies the whole 

 base of the woody tube ; and its lower surface is at first 

 slightly convex, applied to the wood of the tree by a small 

 central protuberance in which is situated the rostrum, which has 

 a short tubercular monomerous mentum and very short setae. 

 Antennae and feet absent. I have failed to find an anogenital 

 ring ; but in the abdominal tube, a little above the point, there 

 seems to be an orifice which may answer for it. There are four 

 large spiracular orifices, and seemingly some others smaller : 

 the trachetE of the former are very large. The abdominal 

 tube is obscurely segmented, the transverse corrugations being 

 very numerous; and it is also longitudinally striated, having 

 the appearance of being composed of strong muscular tissue : 

 at intervals along it there are transverse rows of very small 

 circular spinneret-orifices and of slender hairs. The dorsal 

 cephalic epidermis bears great numbers of circular and also of 

 tubular spinnerets. At gestation the under-side of the ce- 

 phalic region becomes concave, and frequently covers the 

 larvaa : no larvae or eggs have been observed in the abdominal 

 tube ; but possibly they may emerge through the orifice in it, 

 and make their way down to the cephalic disc, so as to escape 

 under the edges of the waxy indusium and thence up the woody 

 tube. 



Female of the second stage reddish-yellow, elliptical, taper- 

 ing slightly posteriorly : length about -g^-in. Antennae short, 

 of seven joints, of which the three first are the longest, the 

 sixth very short. Feet absent. Mentum tubercular, mono- 

 merous. Abdomen terminating in a small simple anal ring 

 with two moderately long setae. Epidermis bearing two median 

 longitudinal rows of figure-of-8 spinnerets and two marginal 

 rows of the same, the innermost of which last rows is only 

 on the cephalic and thoracic regions. This second stage is 

 found in very inconspicuous and minute brown papillae on 

 the bark, which are often scarcely to be detected except by 

 their comparative smoothness : they are not deep in the bark, 

 nor does the insect appear to reach the wood : there is some- 

 times noticeable a commencement of the woody tube ; but I 

 think that this second stage is not of long duration, for the 

 insects in tubes, however short, are nearly always of the adult 

 form and character. 



Larva yellowy darkening as it grows, flattish, elongated, 

 active : length about i^^yin. Form subelliptical, the abdominal 

 region rather dilated, the posterior extremity somewhat acu- 

 minate. Abdomen ending in two very small anal tubercles, 

 each bearing a long seta. Antennae of apparently six or seven 



