1890. J 181 



NOTES ON THE METAMORPHOSES of BRITISH LEPTOCERID^ (No. 2). 

 by kenneth j. morton. 



Section of ODONTOCEEUM. 

 II. — Odontocerum albicorne, Scop. 



Larva stout, nearly cylindrical ; head large, oval ; thoracic segments transverse, 

 prothorax about same breadth as head, the succeeding segments becoming very 

 gradually broader ; first abdominal segment (exclusive of the lateral processes) about 

 same breadth as metathorax, from the first segment the abdomen tapers only a very 

 little towards the extremity. 



Head sparingly hairy ; clypeus long and very narrow ; triangular piece very 

 small and narrow. AntennsB minute, apparently two-jointed, the proximal joint 

 stout, bearing towards its apex a single hair, the distal joint small. Labrum longer 

 than broad ; slightly hollowed and emarginate in front ; fore margin with four blunt 

 processes ; a number of bristles above ; ciliated lightly at sides and beneath. Man- 

 dibles irregularly triangular in outline when viewed from above or beneath ; upper 

 edge irregularly crenate ; seen from beneath the left mandible has a tooth which is 

 absent in the right (absolutely in situ the mandibles have a shorter and stouter look 

 than they have in the figures, and they are less distinctly crenate). Maxillae: the 

 blade on its upper-side armed with three strong spines and numerous small hairs ; 

 beneath with several strong hairs as shown in fig. ; palpi four-jointed, tapering, 

 third joint longest. Labium (spinneret) conical, with two-jointed palpi. 



Thoracic segments sparingly clad with hairs, which are most numerous on mar- 

 gins of plates. Pronotal plate straight in front, produced at sides into a strong 

 tooth ; posterior margin slightly excised, hind angles rounded. Mesonotal plate 

 not extending so far over the sides as the plate of pronotum ; front edge straight, 

 hind one rather rounded. The plates of metanotum apparently less hard ; they 

 consist of a transverse one covering about one-half the length of the segment, and 

 narrower than the plates of the preceding segments ; behind this is a linear one, 

 and there is also a small one above each leg. On either side of each segment there 

 is the usual small plate to which the leg is attached. Legs : fore-legs comparatively 

 long, and although the joints are dilated, they are not so much so as in the larvse of 

 the more typical forms of LeptoceridcB. The second and third pairs become in 

 order, longer and more slender. All the coxse ciliated with long hairs ; femora with 

 long hairs on the outer edge ; femora and trochanters on inner edge with spinulose 

 hairs, and also a few spines in the case of the fore-legs ; tibiae with a few hairs and 

 two short apical spines ; tarsi almost naked, with a few minute apical hairs in a 

 bundle, and one or two longer hairs (the tarsi of the 1st pair are also serrate in an 

 indistinct manner on the inner side) ; claws moderately long, with the usual basal 

 spine. 11^0 '■ 14 '■ 1^T% represent approximately the proportions of the pairs of legs 

 as to length. 



Abdomen with first segment sparsely haired ; two lateral processes and one 

 dorsal. The lateral fringe, composed of fine short hairs, runs from the 3rd to the 

 7th segment inclusive, and is represented on the 8th by a row of black points, from 

 each of which arises one or two short adpressed haii's. The last segment, which is 



