THE BRITISH NATURALIST. [August 



while the male rostrum is shorter and stouter it is also duller and more 

 punctured (or even pubescent) than in the other sex. In Erirhinus 

 vorax, however, and also it is said, in Apion minimum, A . Jilirostre, and 

 A. ononis the male rostrum is the longer. At times the rostrum 

 becomes more curved in the female, as in Balnninus and some Apions, 

 Avhile in a few instances {Magdalinus carhonarius, M. cerasi, 

 Rhopalomesites tardii, &c.) the rostrum becomes distinctly widened at 

 the apex in the male, and though in many instances the antennae are 

 inserted nearer to the apex in the male than in the female (Erirhinus, 

 Mecinus, &c.J the opposite is frequently the case (many Hypera). In 

 only a few instances among the British Coleoptera do we find any 

 sexual modification of the palpi. Those that I have noted are as 

 follows : — In the males of several species of Hydrcena there is a slight 

 difference in the degree of development of these organs ; thus in this 

 sex of H. atricapilla the last joint of the maxillary palpi is thickened 

 and somewhat cut out near the tip. Some of the species of Ocypus 

 fbrunnipes, ater and pedator) have the last joint of the palpi in the 

 male hatchet-shaped, while that of the female is cylindrical, and a 

 similar — but even more marked — securiform development of the last 

 joint occurs in the males of some of the Chrysomelidse — for instance, 

 in Chrysomela banksii, staphylcsa, hcdnioptera, and Gcettingensis, and in 

 Gonioctena olivacea. The most striking modification of the male palpi, 

 however, is seen in Hyleccetus dermestoides and the rare Lymexylon 

 navale, in which species these organs become fan-like from a develop- 

 ment of processes on the third joint. Of the sexual differences in the 

 antennae of beetles the most frequently noticed is a more or less 

 evident elongation of these organs in the male sex - with one exception 

 only among the British beetles, Enthia clavata, a recently discovered 

 clavicorn, in which, according to Fowler, the antennae oi the female 

 are one-fourth longer than those of the male. Simple elongation, 

 without any special alteration in the structure of these organs is 

 found in the males of many of the Coleoptera, and out of a large 

 number of instances the following must suffice as examples : Qiiedius I 

 rufipes and hoops, Prognatha quadricornis, Bryaxis sanguinea, Lanwphlceus 

 duplicatus , pursillus, and ferrugineus ; Lucanns cerviis ; Corymbites 

 tesselatus and quercus, Linionius cylindricus ; Eros aurora, Plwsphcenus 

 hendpterus, most Telephori and the British species of Rhagonyclia , '.\ 

 MaWiinus frontalis, Ptiniis fur, Dryophilus pusillns — in which also, as in ' 

 the genera Priohium, Anohiimi, and Ernohiiim, the last three joints are j 

 especially lengthened in the male; Cryptocephaluslahiatus d^nd pusillus \ \ 

 Ltiperus betidinus, &c. ; Osphya hipiinctata ; Anthrihus albinus, in which j 

 also the end of each joint bears, in the male only, a tuft of white j 

 scales. The maximum of development of the antennae is met with ; 

 m the males of the Longicornia— most notably in AcanthociniLS cBdilis, , 



