Beetles of the family Rutelidse. 263 



this in such an extremely variable species cannot be 

 stated as absolutely invariable. 



The other species of Fairmaire's referred to above is 

 Anomala Q-oculata from Tibet, in which the elytra are pale 

 yellow in the female and brown in the male ; and this 

 exemplifies the general rule for those species which exhibit 

 colour differences, the female beiog characterised by a less 

 development of the colouring matter, which in the male 

 takes the form of darker markings of gronter or less extent, 

 or when at its maximum may suffuse tlie entire surface 

 with black. 



Closely related to A. Q-omdata, and showing the same 

 sexual difference, is A. straminca, Semenow, an insect from 

 North China, which in the female is uniformly straw- 

 coloured, while in the male the elytra are more or less 

 deeply fuscous and the thorax and head marked with 

 patches of the same colour. In his description of this 

 species, the" author speaks of it as " maculis nonnunquam 

 evanescentibus," showing that he had the female, but 

 regarded it as merely a variety. 



In A. mutans, Blanch., on the contrary, the male form 

 has been described as the variety and the female, which 

 is pale, with the exception of a dark-red head, scutellum 

 and suture, as the typical form. The male of this species 

 (the author's " var. tota nigro-picea ") is a shining black 

 over the whole upper surface with the exception of a 

 narrow margin to the thorax and sometimes a fine 

 median line. 



The following new species is remarkable as presenting, 

 as well as a similar disparity in coloration, a peculiar 

 difference in the sculpture of the upper surface, the elytra 

 of the male being shining while those of the female are 

 very densely rugose and opaque, thus recalling a somewhat 

 similar sexual difference which occurs in certain of the 

 Water Beetles. 



A. rugosa, sp. n. 



Ereviter ovata, rufo-testacea ; capite rufo-fusco, dense punctato, 

 clypeo semicirculariter arciiato, niargine paulo reflexo ; prothorace 

 brevi, convexo, nitido, pimctato, lateribiis valde arcuatis, angulis 

 posticis rotundatis, disco bimaculato, maculis triangularibus, basibus 

 in disci medio approximatis, nonnunquam confluentibus ; scutello. 

 rufo vel fusco, grosse punctato ; subtus cum pedibus rufis, tarsorum 

 anteriorum et mediorum unguiculis fissis. Long. 14 mm. 



