. Fig. 1. Dolichojms ungnlatus d". Fig. 2. Tachytrechus ammobates d". Heads showing epistoma and clypeus. the occiput. The labrum is strong, and of a curious shape; it is high at the base, broad and arched; it has a less chitinised median tooth, and on each side a strong lateral tooth; as the labrum is strongly semi- tubular, the lateral teeth lie lower downwards than the median; sometimes the median tooth is not developed. Hypopharynx like- wise strong, it is more or less elongated triangular, sometimes some- what broadly, about of the length of labrum, and like this generally curve
. Fig. 1. Dolichojms ungnlatus d". Fig. 2. Tachytrechus ammobates d". Heads showing epistoma and clypeus. the occiput. The labrum is strong, and of a curious shape; it is high at the base, broad and arched; it has a less chitinised median tooth, and on each side a strong lateral tooth; as the labrum is strongly semi- tubular, the lateral teeth lie lower downwards than the median; sometimes the median tooth is not developed. Hypopharynx like- wise strong, it is more or less elongated triangular, sometimes some- what broadly, about of the length of labrum, and like this generally curved a little downwards at the apex; rarely the apex is two-pointed {MedeterusJ. There are no maxillæ, but one-jointed maxillary palpi, which are large, squamiform, more or less oval; sometimes they are very large; they are hairy and generally with one or several bristles. In rest the palpi repose on the front side of the proboscis. Labium short, as mentioned, only longer in Orthochile and some species of Herco- sfomus; it has the basal part about of the length of the labella; these latter are broad, when spread out they form a nearly circular disc surrounding the median cavity; they have generally hairs at the margin. Whon the labella are closed they form together a somewhat wedge-shaped part. Labium rather strongly semitubular, or nearly tubular, its upper edges going somewhat near to each other; the hole thus formed is rallier large. The basal connecting membrane of the
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishercopenhagengecgad
