1904.] 



OF THE GENUS HIPPORRHINUS. 



11 



8. (7). Geiife compressed ; rostrum never dilated at apex, parallel- 

 sided, or even slightly subulate. Mandibles equal in 

 size, of almost similar shape, scarcely overlapping when 

 closed and the united tips sharply acuminate. First 

 joint of fimicle subcompressed, distinctly bi'oader than 



second when viewed laterally */Stra')nia, gen. nov. 



(Type, Tanyrrhynchus costirostris Boh.) 



Of the above-named five genera the first three are confined 

 entirely to the Cape Colony. Strainia occurs in Natal, Orange 

 River Colony, and the Eastern districts of Cape Colony ; it 

 probably will be fovmd also in the Ti'ansvaal, but it does not yet 

 extend north of the troj)ic. Hvpporrlmius has a much wider 

 range, extending on the eastern side of the continent from Natal 

 to Abyssinia., and on the west from Cape Town to Angola. But 

 it is in the Cape Colony that the genus attains its greatest 

 development, and it appears to flourish even in the most aiid 

 districts ; indeed it is noticeable that these insects steadily 

 diminish the neai'er we apj^roach the heavier rainfall and more 

 kixuriant growth of the eastern littoral, and it is only along the 

 higher plateaux that the genus penetrates into the tropics. 



The Table on pp. 8 & 9 will give a good idea of the general dis- 

 tribvition of the geniis. Unfortunately in all the older collections 

 the specimens, if labelled at all, merely beai' the vague locality 

 " Cape of Good Hope " or " Caffraria." In the case of the Cape 

 Colony species given in the table, there is little doubt that they 

 wei'e all captured within that area, the only uncertainty being 

 whether they are from the Eastern oi- Western Districts. In 

 oi'dei' to make the table moi-e complete, I have ventured on 

 an opinion in these doubtful cases, all of which are marked 

 with a ?. 



Upon analysing the figures shown above, we can moi'e cleaily 

 perceive the distiibutional relationship existing between the 

 various areas, which may best be shown in tabular form. 



Distvict. 



CD QJ 







en ^ 



111? 

 ft Sri f^: 



be .-^ 

 -■' a r- rt 



« 3 ° ai - „ 



r 2P r^ 





CI 



=*^ 



Cape Colony, West . 

 East . 



Natal 



Transvaal 



Orange River Colonv 



Rhodesia 



Angola 



Central East Africa. 



65 

 19 



7 

 12 



2 



(71) 

 6 



3 



(17) 

 8 

 3 

 3 



1 



3 

 ti 



4 

 (11) 



* For description see Appendix. 



