506 Mr. G. Meade- Waldo's revision of the species of 



N. Rhodesia : 85 miles west of Kariba Gorge, vi, 1910, 

 type (0. C. Silverlock), 2 $; Lower Luangwa River, ix. 1910 

 {S. A. Neave). 1 ?. 



Dedicated to its captor, the late 0. C. Silverlock, who 

 was drowned in the Zambesi River, owing to his canoe 

 being overturned by a hippopotamus. The species may be 

 distinguished from 0. gambiensis by the different shape 

 of the second tergite, and distribution of colour, 



0. (Lionotus) pakasae, sp. n. 



$. Flavo-ferrugineus ; capite plerumque, mesothorace, nigris ; 

 clypeo, scapo infra macula triangulari supraclypeali, sinu orbitali, 

 macula lineari post oculos, pronoto, tegulis, scutello, postscutello, 

 tergite 1 anguste, 2-6 late fasciis apicalibus tergite 2 lateribus, 

 flavis ; mesopleuris plerumque pedibusque, flavis ; mandibulis» 

 antennis, segmento mediano, abdominis segmentis 1 et 2 (areis 

 flavis exceptis) coxis anticis ferrugineis; alis fuscis. Long. 8 mm. 

 (^ similis. 



Clothed with a very short, pale pubescence. Clypeus rather 

 longer than broad, pyriform, very slightly emarginate at apex. 

 Pronotum truncate anteriorly, rather wider at the tegulae ; scutel- 

 lum and postscutellum raised, the lateral teeth of postscutellum 

 acute, the space between them not crenulate; median segment 

 with the lateral angles rounded. First abdominal segment very 

 short and broad, the second as broad as long, the first segment 

 entirely ferruginous except for the apical fascia, the second with 

 a large dorsal bilobed area ferruginous, the sides and apex, yellow, 

 following segments with a series of fuscous lateral spots. Posterior 

 coxae with a distinct tubercle behind. 



Head and thorax (except clypeus, tegulae and abdominal seg- 

 ments apically) coarsely punctured; clypeus, tegulae, median 

 segment and abdomen for the most part finely punctured. Wings 

 fuscous. 



Length 8 mm. 5 $ $, 1 c?. 



N, Rhodesia: Pakasa, i. 1911, 3 $$ 1 c^; Sinapunga, 

 ii. 1911 (0. C. Silverlock), 1 $; Portuguese East Africa: 

 Rikatla, Delagoa (Jimod), Schulthess Coll., 1 $; German 

 S.W. Africa: Grootfontein {Volkmann), Coll. Schulthess. 



The specimen from German S.W. Africa is a colour 

 variety with the 4-6 segments of abdomen orange instead 

 of black. 



The species is a distinct one, the different sculpture in 

 the postscutellum of the sexes being interesting. 



