5'2'2 EXTERNAL ANATOMY OF INSECTS. 



four joints naked, and the rest covered with a fine down. 

 In insects that have a knob at the end of these organs, 

 whether lamellated or perfoliate, this down is often con- 

 fined to it, or to its intermediate joints, and seems inter- 

 mixed with nervous papilla?. These are particularly vi- 

 sible in the flabellate antennas of Rhipicera, Lampryris 

 Lalreillii a , Elaterjlabellicornis b , &c. covering both sur- 

 faces of the processes of the joints. In some male bees 

 these papilla? are inclosed in hexagonal spaces into which 

 the antenna? are marked out c . It is to be observed, 

 that in many antenna? the joints of the clavolet have one 

 or two bristles or more at their apex, one above per- 

 haps, and one below; the lower angle in those of the 

 serrated antenna? of Elater is usually so furnished, and 

 sometimes the upper. In many Capricorn-beetles and 

 various insects the antenna? are clothed, instead of down, 

 with stiffish hairs or short bristles. Other insects have 

 these organs, at least the clavolet, beset with longer hairs 

 standing out from them on all sides: of this kind are 

 those of a singular beetle (Sarrotrium muticum) some- 

 times found in this country d . Again, there are some 

 that have only their underside bearded with longer hairs; 

 as Lamia curculiouoid.es, speculifera K., and other Ca- 

 pricorns e . In another of this tribe, Saperda hirsuticoi- 

 nis, the three intermediate joints are ornamented with 

 branches of long black hairs, which give them an elegant 

 and feathery appearance f . In Callichroma alpina the 



3 Linn. Trans, xii. I. xxi.f. 3, 4. Plate XXV. Fig. II. 



b Plate XI. Fig, 17. 



'■ Kirby Mon. Ap. Angl. i, 184. t. x. «.*. d. 1. f. 8. 



" Plate XXV. Fig. 27- c Plate XII. Fig. 26. 



f Plate XXV. Fig. 32. 



