On new Species o/Tabani. 311 



EXPLANATION OF THE PLATES. 



Plate XIL 



Fiff. 1. Leptocheirus subsalsus, sp. n. Antenuules and antennea. 



Fig. 2. „ ,, First ^'nathopod. 



Fig. 3. „ ., Second gnathopod. 



Fig. 4. „ „ First peiieopod. 



Fig.b. „ ,, Last peraeopod, terminal joints. 



Fig. 6. ,, „ Urosonie. 



Fig. 7. Leptocheirus bispinoius, sp. n. Secondary appendage ofantennula. 



Fig. 8. „ „ Plrst peneopod. 



Fig. 9. „ „ Last perseopod, terminal joints. 



Plate XIIL 



Fig. I. Leptocheirus bisj)inosus,H-p.n. First <rnathopod. 



Fig. 2. „ „ Second gnathopod. 



Fig. 3. „ „ Urosonie. 



Fig. 4. Leptocheirtis pinguis,Siim]^aon. Secondary appendage of antennule. 



Fig. 5. „ „ First gnathopod. 



Fig. 6. „ „ Second gnatnopod. 



Fig. 7. „ „ First periBopod. 



Fig. 8. ,, „ I^ast perajopod, terminal joints. 



XLIX. — Deacriptions of Thirty new Sperus o/Tabani /re?//* 

 Africa and Madagascar. By Gertkude Ricardo. 



[Concluded from p. 278.] 



Tahanus tritceniatus, ? , sp. ii. 



One female (type) from Bailundo, Angola, Dec. 1904- 

 Ja.i. 1905 {Dr. F. C. WeUmai^), 1906. 139; one female 

 from l^ilie, Angola, Dec. 1904 (/);•. F. C. JVellman), 

 1906. 139. 



A very small black species nearly allied to T. gratus^ 

 Loew, from which it is further distinguished by the shape 

 of the middle callus, which is larger, occupying nearly 

 the whole width of the forehead, and almost square, with its 

 anterior and posterior borders often irregular, blackish brown; 

 in T. grains it is much smaller and narrower oblong in shape. 

 Its .«mall size will distinguish it at first sight, the type 

 measuring 8 mm., the other female oidy 6^ mm. 



Abdomen with three grey stripes, the middle one attaining 

 the sixth segment, tlie side ones the fourth segment, but 

 sometimes ending before this. Antennie reddish ; the first 

 joint greyish with black-haired upper angle, the third blackish 



