THE HEAD. G9 



and the male THIRTEEN joints. The Diptera, with ..uform and multi- 

 articulate antennae, possess a vai-ying number; BiUo, Latr. (Hirtcea, 

 Fab.), lias NINE ; ELEVEN, Diloplms, Scatopse, and Simnlia ; the Tipu- 

 laria, from THIRTEEN to SEVENTEEN; and all theTipularicefiwgivorce 

 have SIXTEEN. Multiarticulate (20 50) antennae are found among 

 the Lepidoptera; the most of the Ichneumonodea and Urocerata ; all 

 the Neuroptera, and the most of the Orthoptera ; but in many species 

 of the genus Locusta, Leach, there are found FOURTEEN or SIXTEEN; 

 in Gryllus, Fab., not many more than TWENTY ; in Forjicula, some- 

 times only TWELVE or FOURTEEN, but even as many as THIRTY. 



5. Forms of the individual Joints. 



They are in general CYLINDRICAL (teres, s. cylindricus) , but the 

 joints become very frequently thicker towards their end, and conse- 

 quently not unusually adopt an obconic form (a. obconici). Bell- 

 shaped, or CAMPANULATE (. campanulati), are those which are con- 

 cave at their broadest end (PI. VII. f. 10). TORULOSE (a. tornlosi), 

 such as have greater or smaller tumours upon them. Those which 

 are produced laterally into lobes or processes (art. lobati, s. producl'i), 

 have been previously mentioned. Moon-shaped, or LUNATE joints 

 (art. lunati), are found in the male individuals of the genera Ncphro- 

 toma andEucera (PL VIII. f. 29). The first conical joint upon which 

 the antenna turns like a ball within a socket, is called by Kirby and 

 Spence the TORULUS (torulus). 



6. Clothing of the Antennae. 



The great majority of antennae are completely naked ; others, on the 

 contrary, have a clothing consisting of shorter or longer hair, in which 

 case the terms explained above ( 25) may be applied to them. Some 

 peculiar terms, however, may here find a place. 



VERTICILLATE (verticillatce), are those antennae, the joints of which 

 are surrounded, at equal distances, with stiff hair (Erioptera, Psyctioda, 

 PI. VIII. f. 23). 



FIMBRICATE (fonbricatce), on the contrary, when the long parallel 

 hair is placed only upon one side of the joint ; or pectinato-JimbricatfS, 

 when the antennae are at the same time pectinated (Phalcena, PI. VIII. 

 f. 24). 



