STRUCTURES USED IN CLASSIFICATION. 



13 



and Tachygoninse which we place next in the series with straight 

 antennas and each of these has other important supporting char- 

 acters. For example we find in Apionime the elongated tro- 

 chanter intervening between the coxa and the femur; in Alloco- 



Leg 

 a, 



tro- 



Bedei.) 



Fig. 13 Different forms of antennrc; a, of Apion; b, of 

 Allocoi'hynus ; c, of Tliecesterniis; d, of Tachygonns: e, of 

 Anclionits; f, of Acamptus. (Original.) 



rlujnns the extraordinary hind femora, swollen and 

 creuulate on the margin as shown in Fig 40 on a 

 later page, and in TdcJii/goniis (Fig. 15) the re- 

 markable form and length of the hind leg. In Tlic- 

 ccstennis, the antenna (Fig. 13-c) usually described 

 as feebly elbowed, is also of a primitive type. Here 

 the peculiar form of the prosteruum affords a similar 

 supporting character. However, the fades and the 

 form of beak strongly resembles those of Crypto- 

 c , fe- rhynchini, and the genus is therefore placed close 

 to that tribe among the forms with elbowed an- 

 tenna?. We have thus, as the lowest in rank of the Rhynchophora, 

 forms possessing the straight antenna?, common in Ooleoptera 

 genuina, and separated, as between themselves, by peculiarities 

 of structure not observed in the great bulk of the Rhynchophora. 

 In that great bulk we find a development in the antenna? in 

 a different direction. The first joint becomes 

 more or less elongate and is called the scape, and 

 beyond it the antenna is suddenly bent, elbowed 

 or "geniculate'' as it is called in most of the books. 

 Concurrently we find the development of anten- 

 na! grooves to receive the antenna 1 , already no- 

 ticed (Fig. 0), and often a dilation of the tarsi 

 to be noticed later. The club is usually compact, 

 formed of three approximately equal joints, pi g . 15. Hind leg 



of Taclivgoinis. 



plainly separated by sutures; the whole antenna (Original) 



