^5^ Zoological Society. 141 



Hv " I fancy it is not met with south of the Tropic of Capricorn. It 

 ^B» usually found on hills, plains being free from it. I have ridden 

 P"l^ a hill and found the Setse increasing at every step, till at last forty 

 or fifty would be on my horse at once. The specimens you saw cost 

 j me one of the best in my stud. He was stung by some ten or a dozen 

 j of them, and died in twenty days. I myself have been bitten by the 

 Setse ; you would almost fancy it was a flea biting you. Some parts 

 j of South Africa are, I should say, rendered inaccessible by the presence 

 of this pest ; I mean of course to a man who travels in the usual way, 

 with his oxen and horses. 

 ME^ " How far the Setse extends in the interior is of course as yet un- 

 Hpown, but I have certaia information as to its being 200 miles north 

 "of the 'Great Lake' recently discovered by my friends, Messrs. Living- 

 ston, Oswell and Murray. 



" Yours faithfully, 



" Frank Vardon." 

 " J. O. Westwood, Esq." 



The various specimens forwarded to me by Captain Vardon have 

 enabled me to determine that the insect is a new species of Wiede- 

 mann's genus Glossina, which may be thus characterized : — 



Glossina MORSiTANS, Westw. 



I Luteo-albida, thoracis dorso subcastaneo, griseo subtomentoso, vit- 



tis quatuor longitudinalibus in medio interruptis nigris, scutelli 

 apice punctis duobus parvis fuscis ; abdomine paUide lutescenti, 

 segmento basali utrinque macula parva laterali nigra, singula 

 segmentorum quatuor proximorum ad basin fascia nigricanti, in 

 medio interrupta, notatis ; alis parum infumatis. 

 'Long. Corp. lin. 5 ; expans. alar. lin. 8^. 



[The head is of a dirty buff colour, narrower than the thorax, with 

 Irge eyes ; the epistoma is paler coloured and clothed with whitish 

 hairs ; the proboscis is rather longer than the height of the head ; 

 it consists of a slender, horny seta or compound bristle, chestnut- 

 coloured in its chief length, but dilated at the base into a large oval 

 bulbous horny lobe, and upon maceration I was enabled to withdraw 

 from the upper side of the seta (which is consequently grooved), two 

 very delicate styles as long as the proboscis ; the sides of this instru- 

 ment are defended by a pair of elongated, slender setose palpi, as long 

 as the proboscis itself; these are concave on the inside and blackish 

 at the tips, and the setse with which they are clothed are also black, 

 as well as the branched setse with which the arista of the antennae is 

 furnished; the outer surface of the arista itself, under a powerful 

 microscope, is evidently villose. The antennae are inserted in a de- 

 pressed obconic space between the eyes, rounded above, and there 

 are two dark spots on the upper part of the epistoma ; the two basal 

 joints of the antennae are dark in front, and the large third joint is 

 dirty buff-coloured. The thorax is chestnut-red, clothed with a very 

 delicate grey tomentosity and finely punctured ; it is impressed across 

 the middle of the dorsum, and is marked with four longitudinal broad 



