BASED ON A STUDY OF THE MALE GENITAL ARMATURE. 33 



dilated (listally ; lips reflexed; editum((?), or lappet-like extension of the body wall, 

 with nnmerons long hairs. Apart from the form of the superior claspers there 

 is no marked difference between the armature of this species and tliat of 

 G. suhmorsitans. 



Sixty-five examples liave been examined. 



Grlossina submorsitans, Newstead. 



G. siihmorsitans, Newst., Ann. Trop. Med. and Pavasit., IV, p. 371 (1910). 



Nearly related to Glossina morsitans, Westw., in having the tips of all the 

 tarsi dark. There are two well-marked varieties : a dark form and a light form. 

 The former may be readily distinguished by its general dusky or dull vinous grey 

 colour and generally smaller size ; the pale form, however, very closely, resembles 

 G. morsitans in the general colour of the abdomen ; but in both forms the 

 transverse black abdominal bands are : 



(a) much more clearly and sharply defined ; 



(b) equally and more narrowly interrupted in the median line on the third, 



fourth, and fifth segments : 



(c) slightly rounded medially and suddenly tapering towards the lateral 



margins. 

 In G. morsitans the bands are : 



(a) not so sharply defined medially ; 



(b) imequally interrupted in the middle line, the space between the two 



divisions of the band on the third being much greater than the space 

 between those on the fifth segment ; and the dark colour gradually 

 shading off into the pale colour forming the median line ; 



(c) broadly rounded medially nnd very gradually tapering towards the 



lateral margins. 



The genital armatures of the males of these two species are easily separable 

 by the form of the median lobes (figs. 16, 17, ml) and other characters 

 (see p. 36). 



Length, 7 to 8 millim ; length of wing, 7 to 8 millim. 



Dark Form. — Head. Frontal stripe smoky brown or red brown to ochreous, 

 ridges paler ; cheeks clothed with greyish dust ; jowls clothed with long white 

 hairs ; roof of buccal cavity with two more or less angular patches of brown. 

 Antennae dusky ochreous grey to pale red-bufF, sometimes infuscated at the 

 tip : arista with the proximal ventral portion dark brown. Palpi greyish buff : 

 usually cinereous above, apical portion infuscated, tips usually black. Thorax 

 grey, often with a faint vinous tinge, the elongated brownish markings sometimes 

 reduced to small and more or less elongated spots ; scutellum normal ; pleurae 

 ochreous grey. Abdomen olivaceous grey (greenish grey), generally with a 

 vinous tinge, paler at the margins ; second (first visible) segment generally with 

 a large infuscated blotch on each side, near the outer lateral margin of which is 

 a clearly defined small blackish brown spot ; in some instances the small spot is 

 quite separated from the infuscated blotch, in others the small spot only i,o 

 visible ; segments 3 to 6 with clearly defined brownish black bands interrujDted 



19127 G 



