294 



A NEW SPECIES OF TSETSE -FLY ALLIED TO 

 GLOSSINA PALPALIS, ROB.-DESV. 



By ERNEST E. AUSTEN. 

 {Published by permission of the Trustees of the British Museum.) 



Glossina caliginea, sp. n. 



^ ? . Length, cT (15 specimens) 8 to 8*5 mm.*, $ (15 specimens) 9 to 

 10 mm. ; width o£ head 2*8 to 3 mm. ; width of front at vertex, (^ 0*75 mm., 

 ? 1 mm. ; length of wing, (^ 8 to 8'75 mm., ? 9'4 to 10 mm. 



Allied to and resembling Glossina palpah's, Rob.-Desv.^ but browner^ and 

 usually somewhat larger ; head distinctly broader, front if anything slightly 

 narrower., at least in ^ ; dark portion of dorsal surface of abdomen browner 

 {dai'k sepia-brown, instead of clove-brown or blackish-brown), paler area on 

 second segment, instead of being confined to a, usually narrow, median triangle, 

 broad and more or less quadrate or irregular in outline, its lateral margins 

 being generally ill-defined ; liypopygium of ^ buff or ochraceous-buff', instead 

 of grey as in typical G. palpalis ; pollinose dorsum of seventh abdominal 

 segment in both sexes often cream-buff, and consequently yelloiver than in 

 G. palpalis ; extreme hind margins of preceding segments [except posterior 

 angles) never lighter. 



Head : face, jowls, and occiput coloured as in G. palpalis, but sides of face 

 (parafacials) slightly narrower, and jowls not descending so much posteriorly 

 {i. e. lower margin of eye nearer to lower margin of head on each side) ; 

 frontal stripe chestnut ; frontal margins (sides of front or paraf rontals) 

 varying from light mouse-grey to olive, often darker than in G. palpalis, 

 showing, as in the latter species, a dark brown elongated area below when 

 viewed from the side ; ocellar triangle drab-grey or mouse-grey, ocellar 

 spot and dark brown band uniting vertical bristles as in foregoing species ; 

 antennce mouse-grey, narrowly cream-buff at apex of second joint and 

 extreme base of third joint on outer side, anterior and posterior edges of 

 third joint in both sexes without a long and conspicuous fringe of fine pale 

 hair f isf- hgs. 1 and 3), and its distal extremity only moderately prominent, 

 arista distinctly longer and more slender (tapering off less abruptly) th:m in 



* A specimen in tlie Museum collection with its abdomen distended "by coagulated blood 

 measures 9-4 mm. in length. 



t There is a fringe on the third joint of the anteimge, but it is so short and the hairs 

 composing it are so minute as to be scarcely noticeable when the joint is examined in profile 

 under an ordinary platyscopic lens. 



BULL. ENT. RES. VOL. I. PART 4, JANUARY I9II. 



