FAM. 84. AGLYCYDERIDAE.—_Tarsi three-jointed, the second joint lobed; head not prolonged to form a beak._ The two most important features of Rhynchophora are absent in these Insects, while the other structural characters are very imperfectly known, many parts of the external skeleton being so completely fused that the details of structure are difficult of appreciation. Westwood considered the tarsi to be really four-jointed, but it is not {298}at all clear that the minute knot he considered the third joint is more than the articulation of the elongate terminal joint. The family consists only of two or three species of _Aglycyderes_, one of which occurs in the Canary Islands, and one or two in New Zealand and New Caledonia. The former is believed to live in the stems of _Euphorbia canariensis_; a New Zealand species has been found in connection with the tree-ferna. _Cyathea dealbata_ [Illustration: Fig. 151—_Aglycyderes setifer_. Canary Islands. A, Imago; B, tarsus according to Westwood; C, according to nature; D, maxilla; E, labium.] FAM. 85. PROTERHINIDAE.—_Tarsi three-jointed, the second joint lobed; head of the male scarcely prolonged, but that of the female forming a definite rostrum; maxillae and ligula entirely covered by the mentum._ As in the preceding family the sutures on the under side of the head and prosternum cannot be detected. The minute palpi are entirely enclosed in the buccal cavity. There is a very minute true third joint of the tarsus, at the base of the terminal joint, concealed between the lobes of the second joint. The family consists of the genus _Proterhinus_; it is confined to the Hawaiian Islands, where these Insects live on dead wood in the native forests. The genus is numerous in species and individuals. [Illustration: Fig. 152—_Proterhinus lecontei_. Hawaiian Islands. A, Male; B, female; C, front foot, more magnified.] STREPSIPTERA (or RHIPIPTERA, Stylopidae).—_Male small or minute; prothorax extremely small; mesothorax moderate, the elytra reduced to small, free slips; metathorax and wings very large; nervuration of the latter radiating, without cross nervules. Female a mere sac, with one extremity smaller and forming a sort of neck or head._ {299}[Illustration: Fig. 153.—Sexes of Strepsiptera. A, Male of _Stylops dalii_ (after Curtis); B, female of _Xenos rossii_ (after von Siebold).]