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Show 1900.] INSECTS AND ARACHNIDS FROM SOMALILAND. 51 them and the marginal groove on each side another similar but curved groove which extends from in front of the middle of the dorsal area back as far as the posterior end of the marginal groove; in addition to the punctures in the grooves there are a few coarse punctures scattered here and there ; posterior border with eleven festoons. Adanal plates narrowed in front, but not extending far forwards beyond the anus ; their inner border nearly straight, external border convex ; posterior border produced into a short external and a long spiniform internal tooth, which projects nearly as far back as the posterior border of the dorsal plate, the apex of this spine is obliquely truncate and subbifid, above it is a second strong spine; a pair of postanal sclerites. Coxce of 1st leg strongly bidentate; of 2nd to 4th also bidentate, the two teeth being on the posterior border, one proximal, the other distal and thinner. Total length 4-8 mm. Two undistended female specimens, probably referable to this species, have the cephalic plate about as wide as long, reddish in the middle, blackish at the sides, the cervical grooves deep, a row of large punctures representing the marginal grooves on each side, some large punctures along the lateral edge in front of the eye, a few between the cervical grooves, and a few large ones and many smaller ones on the middle of the posterior area. The abdomen is impressed posteriorly with three shallow grooves and is obsoletely festooned. Coxce of the legs posteriorly weakly bispinate, the external spine being the larger. Loc. Bularli in West Somaliland (May 1895). Six specimens. Type (male) and two co-types (male and female) in the British Museum. Three co-types (2 males and 1 female) in the Hope Museum at Oxford. The males of the three species of this genus obtained by Mr. Peel may be determined as follows :- (d) u. Dorsal plate marked behind with a pair of moderately long grooves, one on each side of the middle line; between these and the deep marginal groove there is a third long aud deep groove extending from the second or third sulcus of the festooned border past the middle of the dorsal plate ; adanal plate produced behind into a long and strong spiniform process, immediately above which there is a second strong spine ; a pair of chitinous postanal sclerites armatus. b. Dorsal plate with a longish posterior median sulcus and a pair of shallower impressions, one on each side of it, with only a very short shallow and inconspicuous groove between the marginal groove and the middle line ; adanal plate not produced behind into a long spiniform process; no spine above the termination of this plate. a'. Dorsal plate yellowish white, with large symmetrically disposed reddish-brown patches ; legs brown, painted with white above; dorsal plate sparsely punctured ; marginal groove represented by a series of punctures, marmoreus. b'. Dorsal plate deep brown with blacker patches and yellow lateral margin; legs uniformly brown; dorsal plate closely and irregularly punctured ; marginal groove distinct sanguineus. 4* |