88 RKVISION OF THE AUSTRALIAN AMARYGMIDES, 



to apportion the species confidently between the two genera, 

 except in those instances where it is possible to identify them on 

 other characters. Fortunately there are fairly marked diflerenc' s 

 of other kinds distinguishing Amo.rygmus fiom Chalcopterus, so 

 that it is practicable in the case of most of the described species 

 to make at least a very good guess from the descriptions to which 

 genus they belong. The species with truncate mandibles are 

 never (judging from many hundreds of specimens that I have 

 examined) of very small size, whereas those with bifid mandibles 

 include many such and none very large ; the vestiture of the tarsi 

 in the species with bifid mandibles is always of bright fulvous 

 colour, whereas the vestiture in those with truncate mandibles is 

 usually black ; in the former the clypeus is, with scarcely ii.n 

 exception, much less reflexed above the base of the antennae than 

 in the latter ; in the former there are almost never well-defined 

 ocular sulci, and the colour of the legs is much more variable, not 

 a few species having them entirely rufous and many having black 

 legs with testaceous or rufous tarsi, while in the latter the ocular 

 sulci are often very strongly developed, and with one or two 

 exceptions (in which the whole legs, or the femora only, are 

 rufous) the legs are entirely black or pitchy-black. The following 

 species I can attribute definitely to Amarygmus as the result of tlie 

 examination of well authenticated specimens, viz. — convexiusculus, 

 Macl. ; convexus, Pasc. ; exilis, Pasc. ; foveolatus, Macl. ; striatus, 

 Mad. ; torridas, Pasc. ; tyrrhenus^ Pasc. ; variolarls, Fasc. ; and 

 I hav3 no doubt, judging from their general characters, that the 

 following are also Amarygmi, viz. — cupido, Pasc. ; ellipsoides, 

 Pasc. ; i7idagaceus, Pasc. ; mau7'ulus, Pasc. ; minutics, Pasc. ; 

 picicornis, Hope ; pusillus, Pasc. ; semissus, Pasc. ; tarsab's, Pasc. • 

 and tristis, Fab. Of these latter I have identified more or less 

 confidently — cuindo^ Pasc. ; indagaceus, Pasc. ; minutus, Pasc. ; 

 semissus, Pasc. ; tarsalis, Pasc. ; and tristis. Fab. There are thus 

 four species that I have been unable to identify and am obliged 

 to pass over in silence, viz. — eUip)Soides, Pasc, ; niauridiLS, Pasc. ; 

 pusiUus, Pasc. ; and picicornis, Hope. I do not think that I have 

 seen any of those four, but there is a possibility that I may have 



