Report of first expedition to South America, 1913 . Fig. 7. —Simulium larva, No. 2. Labium. the dentate apical margin narrow; median tooth large, trifid as the adjacent smalltooth is advanced forward, next tooth very small, next larger, followed by a largelateral tooth which is shorter than the median one; along the side of the labium isa row of three bristles, the anterior one large, the other two growing successivelysmaller. The anal respiratory organs are not extended in any of the specimensand I have been unable either to evert or observe them in examples treated withpotash or peroxide, al
Report of first expedition to South America, 1913 . Fig. 7. —Simulium larva, No. 2. Labium. the dentate apical margin narrow; median tooth large, trifid as the adjacent smalltooth is advanced forward, next tooth very small, next larger, followed by a largelateral tooth which is shorter than the median one; along the side of the labium isa row of three bristles, the anterior one large, the other two growing successivelysmaller. The anal respiratory organs are not extended in any of the specimensand I have been unable either to evert or observe them in examples treated withpotash or peroxide, although the integument covering these organs is not destroyedby such
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