68 Descriptive Catalogue [1897. 



Var. /3. Similar to the type ; elytra having in both sexes the 

 shoulders noticeable, a little rounded, but still quadrate ; eyes large. 



The shape of the elytra vary extremely ; in the type form both 

 sexes are attenuated at base without prominent shoulders, and the 

 eyes are small ; in the variety /3 the elytra are not attenuated at the 

 base in both sexes, and the shoulders are very marked, and square, 

 and the eyes are much larger. 



Whilst in B. variabilis polymorphism occurs only in the male, in 

 B. nasuta it is conspicuous in both^ sexes, but the characteristics of 

 the sexes do not vary, and form /3 must be considered as a mere 

 variety. 



It is easy to distinguish the male of this species by the projecting 

 frontal part and the excavation on the under side of the head. 



B. nasuta is closely allied to B. armata, both having a longitudinal 

 sulcus in the prothorax, but it differs in being smaller and of a 

 lighter colour, the head is longer, the antennae stouter, and the 

 prothorax less transverse. 



Common in the neighbourhood of Cape Town (Newlands, Table 

 Mountain). The variety /3 is much rarer, and seems so far to be only 

 found at Newlands. 



Eaffrayia calcarata, 

 Plate XVI. , fig. 6. 



Very closely allied to B. variabilis and B. incerta, and differs 

 merely by the sulci on the head being less oblique, the antennae 

 thicker and shorter and the jojnts more moniliform, the tenth is 

 slightly and the ninth very transverse ; shoulders oblique, better 

 defined ; the impression on the first dorsal abdominal segment is 

 much more conspicuous, and narrower than the third part of the 

 width of the disk. 



Male : Metasternum depressed, last ventral segment much sinuate 

 at apex ; intermediate tibiae with a long, strong, oblique inner spur a 

 little before the apex. 



Female : Metasternum convex, tibiae without spur. 



Only a few examples found in the vicinity of Cape Town. 



The three species B. incerta, B. variabilis, and B. calcarata are 

 very closely allied ; the male of variabilis is at once distinguished by 

 having the under part of the head impressed ; in calcarata and in 

 incerta the under part of the head is not impressed, but in the former 

 the intermediate tibiae have a very long spur, which is entirely 

 wanting in the latter. 



The females are not so easily distinguished. B. incerta differs 

 from both B. variabilis and B. calcarata in being larger, more 



