1902.] SPIDERS FROM BORNEO AND SINGAPORE. 251 



which will devovir a single specimen of beetle or butterfly entirely 

 for the sake of curiosity, only manifesting disgust or the reverse 

 wl en that cviriosity is fully satisfied. 



Of the mimicking species it is not necessary to say much, their 

 resemblances to their models being in every case most obvious. 



Amongst the Lamiidte, the Phytceciince again yield the majority 

 of mimetic species (a newly-discovered Daphisia, yellow in colour, 

 is banded with black in almost identically the same manner as 

 C . annularis) (compare figs. 34&31 on Plate XX.) ; and amongst 

 the Cera,mbycid«, the Lepturince are also fruitful in this respect. 

 One species of Leptura, with reddish head and prothorax and 

 yellow black-banded elytra, is closely similai- to Demonax mustela 

 (compare figs. 40 & 39, Plate XX.) : another species allied to 

 Leptura histrionica (Pasc), black with cream-coloured bands, is 

 not readily distinguishable from Xylotrechus decoratus (compare 

 figs. 42 (fe 41) and one or two species of Demonax. Plate XX, 

 and its explanation should be consulted for the representation of 

 other examples given in Table III. but not further indicated 

 in the text. Polyphida clytoides (Pasc), Psalanta chalyheata 

 (Pasc), and Chlorisanis viridis (Pasc.) I have never seen, but 

 good figures of them are published in Pascoe's paper on the 

 Longicornia Malayana (Trans. Ent. Soc ser. 3, vol. iii.). The 

 remaining mimics of the iridescent green CalUchromince, viz. 

 Nos. (4), (10), and (12) in Table III., are shown in figs. 47, 48, 

 and 44 on Plate XX. and their models in figs. 45, 46, and 43. 



[The mimetic resemblance to the Clytince exhibited by so namy 

 species of distantly related Bornean Longicorns is of extreme 

 interest. The widespread species of this dominant group have 

 developed, in a great majority of cases, a black and yellow or black 

 and orange transverse banding, which superficially resembles the 

 characteristic appearance of wasps and hornets. This rough 

 resemblance is further heightened by the active movements of the 

 living beetle, which suggest those of a Hymenopterous rather 

 than a Coleopterous insect. Such an appearance is found in 

 Clytince of many species from the whole Palsearctic and Xearctic 

 belt, from Mexico, Malaya, Australia, and probably many other 

 countries. An Australian species, Aridceus thoracicus (Donovan), 

 has the deep brownish-orange colour of the alternate sti'ipes, as well 

 as the comparatively few broad black bands which are character- 

 istic of wasps from the same region. Clytanthus sex-guitattis 

 (Lucas) from Morocco suggests the appearance of a Mutillid or 

 perhaps a Clerid with a Mutillid form of colouring. The 

 Bornean Scleihrus amvemis (Gory) mimics the aggressive Coleo- 

 pterous Tricondyla (Cicindelidse), while species of the Tillo- 

 morjihince, allied to the Clytince., mimic ants, e. g., Euderces 

 picipes (Fab.) of N. America and Clytellus icestiooodi (Pasc.) of 

 Borneo. Thus we witness within the limits of one large group 

 of Coleoptera a great development of mimicry of aggressive 

 specially protected forms. Such mimicry has been hitherto 

 assumed to be Batesian (pseudaposematic), although the dominance 



