. Bulletin of the British Museum (Natural History). 2o8 A. F. STIMSON be due to real morphological differences. The lateral groove is absent on the first 33 to 39 annuli and becomes well defined between the 43rd and 55th annulus. The precloacal pores are well developed on BMNH , fainter on UMMZ 131700 and not visible to the naked eye on BMNH These pores are situated on the terminal segments of the first lateral annulus (fig. 2) The coloration of the paratypes is basically the same as that of the holotype, BMNH and MZUSP 21277 being more heavily pigmented and BMNH
. Bulletin of the British Museum (Natural History). 2o8 A. F. STIMSON be due to real morphological differences. The lateral groove is absent on the first 33 to 39 annuli and becomes well defined between the 43rd and 55th annulus. The precloacal pores are well developed on BMNH , fainter on UMMZ 131700 and not visible to the naked eye on BMNH These pores are situated on the terminal segments of the first lateral annulus (fig. 2) The coloration of the paratypes is basically the same as that of the holotype, BMNH and MZUSP 21277 being more heavily pigmented and BMNH and UMMZ 131700 less so. In alcohol the eye is not visible externally and there is no indication that the ocular scale is more translucent than the adjacent cephalic scales. Dissection of MZUSP 21277 reveals a small pigmented eye with a discernible pupil situated below the posteroventral angle of the ocular. Body annuli. Gans & Rhodes {1964 : 16) discussed irregularities in the arrange- ment of body annuli of A. kingii and remarked upon the lack of intercalated dorsal half-annuli. A. bilahialatus has up to six supernumerary dorsal half-annuli and exhibits numerous other annular irregularities, most of which occur in the anterior third of the body. These take the form of intercalated half-, quarter- and part- annuli and the fusion of one or more segments with those of an adjacent annulus. Shifts in alignment of halves and sometimes quarters of annuli are common and often result in combining two or more annuli into a single spiral. A good example of this occurs in the holotj'pe where nine annuli (49th to 57th) form a continuous spiral. Supernumerary dorsal half-annuli are calculated by simply deducting the ventral count from the dorsal count. In view of the intermittent vertebral non-alignment of annuli and other irregularities it was felt that a better picture of the extent of. 1mm. Please note that these images are extracted from scanned page images that may have
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Keywords: ., 1973, boo, bookauthorbritishmuseumnaturalhistory, bookcentury1900
