Sifnopsis of the Tsetse- Flu s. loo 



of S abdomeu less Lairy laterally ; bristles 

 on sixth segment in J stouter and more 



conspicuous morsitans, AVestw, 



7. Dorsum of thorax with four sharply defined 

 small dark brown oval spots, arranged in a 

 parallelogram, two in front of and two 

 behind transverse suture ; bulb at base of 



proboscis brown at the tip lonyipennis, Corti, 



Dorsum of thorax without such spots, though 

 with more or less distinct longitudinal 

 stripes ; bulb at base of proboscis not brown 

 at the tip fusca, "Walk. 



In the Monograph aheady referred to, Olossina tachinoides , 

 Weslwood, was regarded by the writer as a variety of 

 01. palpah's, Rob.-l)esv.* Within the last few days, how- 

 ever, the British Museum has received from Mr. W. F. 

 Gowers a series of fifty tsetse-flies from the Benue River, 

 Northern Nigeiia, wliere they were collected by the donor 

 during a journey down the river in a canoe in the latter half 

 of May and beginning of June of the present year. In 

 general appearance these specimens closely resemble small 

 individuals of GI. morsitans, but may be at once distinguished 

 from this species by their dark hind tarsi. On comparison 

 wnth the type of Gl. iachincides , Westw.f, now in the collec- 

 tion of the Hope Museum, Oxford, not only were Mr. Gowers's 

 specimens found to be specifically identical with it, b;it the 

 examination of this fine series showed that Ol. tachinoidis 

 must be restored to specific rank, as a near ally of GL morsi- 

 tans, Westw. Except as regards the colour of the hind tarsi, 

 Gl. taclnnoi'des, which is the smallest of all the tsetse-flies, is 

 not closely related to Gl. 2yo/palis. The forms previously 

 regarded by the writer as constituting a variety of Gl.palpalis, 

 Eob.-Desv., and designated by him var. tachinoides, Westw., 

 must now be considered a variety of palpalis, which may 

 for the present remain unnamed. The Biitish Museum also 

 possesses two other specimens — one from Old C^alabar, May 

 14, 1900 [Dr. Annett), the other from Benin {A. Millson) — 

 which appear to represent a second variety of Gl. palpalis. 

 In the colour of the abdomen, at any rate, this second variety 

 presents a certain approximation to Gl. pallicera, Bigot. 



Quite recently Gl. tachinoides, Westw., has been redescribed 

 by Dr. E. Brumpt, of the Laboratoire de Parasitologic, Paris, 

 under the name Glossina Decorsei. An examination of 



* Cf. op. cit. p. 74. 



t This type is a mere fragment, but fortunately sufficient leaiains for 

 purpoE.es of idenlitication. 



