161 



every naturalist who has looked for insects in Australia ; 

 whilst the species of Mandalotus as a rule are obtained only 

 by entomologists who are well acquainted with insects hav- 

 ing similar hiding-places or habits. As a matter of fact, very 

 few localities in Australia have been systematically explored 

 for them. 



At a glance the species appear to be remarkably alike 

 and difficult to distinguish, and this is certainly the case 

 with the females. But the males of the majority have re- 

 markable secondary sexual characters. These have been 

 made use of in the table previously given by me,('*) but some 

 other remarkable ones occur in the species described below;, 

 in the prosternum, meso- and meta-sternum and coxae. 

 There is also a specimen of an undescribed species in the 

 National (Melbourne) Museum, with a conical tubercle on 

 each of the front coxae. It seems probable, therefore, that 

 many other remarkable features exist in the species which 

 have still to be described. 



Unfortunately these masculine features are confined to 

 the under surface and legs, so that to see them clearly it is 

 necessary to have the specimens mounted on their sides or 

 backs. 



To bring the males of the species described below into 

 line with those in the table previously given by me, the fol- 

 lowing letters, etc., may be of use: — 



A A. 1. Protlioracic sculpture transversely 



arranged mesosternaUs, n. sp. 



2. Protlioracic granules not so 

 arranged. 

 c. 



3. Space between middle and 



front coxee almost equal ... ruclis, n. sp. 



4. Space between middle coxse 



much greater than between 



front coxse cruclus, Er. 



AAA. 1. Prosternum tuberculate. 



* Tubercle in front of coxee 



and notched armipectus, n. sp. 



** Tubercle behind coxae and 



conical prosternalis, n. sp. 



2. Prosternum not tuberculate. 



B. ■ 



AAA A. Mesostevnum with a process 



which is notched at apex ... incisus, n. sp. 



BB. 1. Metasternum bituberculate ... metasternalis, n. sp. 



2. Metasternum not bituberculate ... 

 C. 



(4) These Transactions, 1907, pp. 131-135. 



