31. Viewed from the mesial or distal the buccal height of contour is in the gingival third of the tooth. 32. The head upperside is dark grey with a blackish mesial stripe and a distinct white line above the eye. 33. The underside of the palpus, middle of the thorax and the mesial abdominal patches are all greyish white. 34. There is a narrow, black mesial line on the abdomen upperside with five elliptical, pale yellow spots. 35. Type I involves failure of eruption of teeth distal to the most mesial affected tooth to be all same. 36. From a lingual aspect, they have well developed mesial and distal marginal ridges and a well-developed cingulum. 37. Like P 4, their distal root is wider than the mesial and formed by the fusion of two roots. 38. In the lower molars the accessory denticles on the mesial edges are replaced by a deep groove called the reentrant groove. 39. Adults have a rufous tail, a distinctive white iris, and a white throat bearing a dark mesial stripe bordered. 40. The green line, indicating the dental midline, is the defining line when it comes to mesial -distal direction.
