196 Coleojyterological Notices. 



upper surface, as well as the conical and attenuate form of the 

 abdomen, reminding us forcibly of P. Dudleyanus. 



Whatever future investigation may prove it to be, the following 

 short description will serve to make known its most salient charac- 

 ters : — 



Body fusiform, obtusely rounded in front, attenuate and acute behind — 

 nearly as in Lepisma, but with the abdomen more strongly and evenly coni- 

 cal, — convex, and covered densely above and beneath with large pearly-white 

 closely recumbent strigose scales ; integuments soft, membranous and pure 

 white throughout. The head is deflexed, densely squamose, devoid of eyes 

 and ocelli, having the antennae inserted on the front, approximate and sepa- 

 rated by a narrow very feeble ridge, very perceptibly attenuate from base to 

 apex, rather more than one-fourth as long as the body, cylindrical, 12-jointed, 

 the subbasal joints short, closely ai>proximate or subconnate, the outer more 

 elongate and more loosely articulated, the joints annulated with fine impressed 

 grooves, one to three in number. The maxillary palpi are moderate in length, 

 cylindrical, 4-jointed, the last joint longest. The labial palpi are large and 

 strongly developed, with the last joint very large, ovate, pointed at apex, 

 concave without and convex within. The three segments of the thorax are 

 distinct, the flanks thin and descending very noticeably below the plane of 

 the lower surface, the pronotum as long as the mesonotum and metanotum 

 combined, each of the dorsal segments, including those of the thorax, bearing 

 a transverse apical series of long widely spaced tactile setse. The six legs are 

 short, the coxje large, conical, the femora robust, the tibite robust, cylindrical, 

 each with a large terminal spur ; tarsi cylindrical, composed of two joints, the 

 second twice as long as the first ; claws two in number, minute, arcuate. The 

 abdominal segments are ten in number, counting the small terminal segment, 

 which bears a small axial anal style composed of seven or eight joints ; there 

 are also two short lateral anal stylets, composed of a few closely connate joints ; 

 the sutures between the abdominal segments almost concealed by the dense 

 vestiture. The length of the largest specimen examined is 2.5 mm., the 

 greatest width being 0.8 mm. 



One of the most remarkable structures distinguishing this larva 

 is a very large fleshy appendage projecting from the lower surface 

 of the abdomen, just behind the fifth segment, and nearly as large 

 as the entire abdominal vertex beyond it. It is mobile about its 

 point of attachment, elongate-oval, longitudinally and very narrowly 

 divided throughout the length, forming two thick elongate cylindro- 

 conical lobes, which are densely, finely pubescent, and provided in 

 addition with long sparse setae, especially at the sides. The lobes 

 are divided by transverse sutures into six segments, of which the 

 three basal are very large, together occupying four-fifths of the 

 length, the three last small and composing the rapidly acuminate 



