Broadly distributed throughout east Africa, R. boulengeri has been reported from Eastern Zaire (Democratic Republic of the Congo), Rwanda, Burundi, Uganda, Kenya, and Tanzania. It inhabitats the leaf litter and grasses of the rain forest floor. It was once considered a subspecies of R. spectrum. Both males and females possess a small rostral process of enlarged scales. The casque is flattened but there enlarged conical scales that form a spinose process above each eye. Males and females are best distinguished by the tail of the male. There is a small, scalloped dorsal crest. Gular and ventral crests are absent although there are a few scattered spinose scales on the throat. Maximum total length is only slightly more than 3 inches. The basic coloration is composed of browns and grays with 1 to 3 diagonal stripes on the flanks running in the anterodorsal to posteroventral direction
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