250 PREDACIOUS AND PARASITIC 



width between the top of the eyes, and the entire width being as 

 nearly as possible two and a-half times the length. The projection 

 of the labrum is much less obvious than in the larva, no doubt 

 from the modification in the proportions of the parts ; the differ- 

 entiation of the ' face ' into the central lobe and the gence, or 

 cheeks, is generally well marked, and the attachment to the frontal 

 thoracic segment — the pionotion — is by means of a narrow collar. 

 The surface is smooth, impunctate in all specimens I have seen, 

 free from hairs or bristles, and varying in colour from black to 

 reddish brown and ochreous yellow. 



The Antenna. 



These organs are equal to or exceed, in length, that of the 

 entire insect, and are strongly characterised by the contrast between 

 the anterior and basal joints. The substantial first joint is about 

 one-eighth to one-tenth the length of the entire organ, and is 

 slightly inflated rather in advance of its centre ; it is approaching, 

 or quite, black in colour, and is fairly covered with rather long, 

 thin hairs of ordinary structure. The second joint occupies fully 

 one half of the entire antenna in average specimens. It is towards 

 the base narrow, rigid, and very distinctly black ; the central 

 portion in pale specimens is usually yellow, and in dark specimens 

 nearly black, and increases somewhat in size towards the final 

 portion, which is enlarged and ends with a square shoulder, and 

 has a slightly domed transverse termination. The whole of the 

 joint is regularly clothed with stiff, fine hairs of ordinary structure, 

 partaking usually of the colour of the derma, from which they 

 rise ; towards the thickened end they become much more dense, 

 and are also slightly longer and stouter ; the colour is here very 

 black. 



The two final joints are together about three-fourths the length 

 of the second joint. 'I'hey are parallel-sided and are considerably 

 less in diameter than the preceding joint at its narrowest point, 

 sparsely clothed in fine even hairs, which differ considerably from 

 those found in the same situation in the nymph. The colour of 

 these segments varies in different specimens from yellow to brown 

 or black ; the final joint is usually about two-thirds the length of 

 the third joint, which it otherwise resembles in every respect. 



