389 



Both of these are unknown to me ; but the characters given by Brandt 

 are sufficient to show that they belong to two distinct sections of the 

 group Spirobolus. In fact it is highly probable that olfersii is referable 

 to the section that Karsch has called Bhinocricus ; consequently for 

 bungii and its allies we may retain the name Spirobolus. Now a Chi- 

 nese species known to me and evidently a very near ally of bungii 

 belongs to a type which is very common in Mexico and some of the 

 Southern States of N. America. Probably Sp. americae-borealis (Beau- 

 vois) == marginatus (Say) is one of the best known examples of this 

 group. At all events I propose to restrict the name Spirobolus to 

 this perfectly natural assemblage of species. 



In the collection of Iulidse obtained by Dr. Max Weber there were no 

 representatives of Spirobolus , using the word as now restricted by me ; 

 but the specimens fall readily into three apparently natural sections, 

 one of which is certainly the typical Bhinocricus of Karsch, which I 

 have attempted more accurately to define. The second section is nearly 

 allied to Bhinocricus and it may be no easy task in every case to 

 distinguish the two. But there is no doubt that it contains a large 

 number of Oriental species which are recognisable at a glance as be- 

 longing to it. I select Sp. goësi, Porat as the type of this group 

 which may be called Trigoniulus. The 3 rd section which also contains 

 a large number of Oriental forms, I propose to term Spirobolellus , 

 selecting as the type the species here named chrysodirus. To define 

 accurately the limits of these three groups would entail the exami- 

 nation of an enormous amount of material and the expenditure of a 

 great deal of time. I have consequently in this paper confined myself 

 to pointing out some of the easily ascertained features of each. 



Synopsis of the species and genera. 



a. Labral punctures 2 + 2 : pores distinctly in front of the sulcus ; 



1 st segment smaller laterally ; colour uniform or transversely banded. 



a 1 . 1 st segment short and widely rounded laterally, not extending 



inferiorly nearly so low as the 2 nd ; scobina present. Rhinocricus 



a 2 . With an acute tail projecting beyond the anal valves, (of 



large size, stout, sulcus incomplete dorsally, the anterior 



dorsal area finely striate transversely) weberi. 



o 2 . Anal tergite not projecting beyond the valves. 



a 3 . Of small size , stout , legs shorter, segments almost smooth 



