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16. A New Genii* <>f Chirouoinid (Dipterci) from the Cape. By 



J. J. KlEFFER, D.Sc. 



THE two insects from the Cape which I described under the names of 

 Paraclunio fuscipennis and P. minor, u. spp.,* must form a new 

 genus Trissoclmrio. It will be placed airong those in which the 5th 

 tarsal joint is trilobate and without pulvilli, and the palpi bi-jointed 

 as in the following table. 



1 Wing rudimentary, without nervine; em- 

 podium filiform and bearing on the ex- 

 ternal side simple or bifurcate hairs ; no 

 hair on the medial side ; claws simple in 

 the $ , bifid in the $ , the two ranii equal ; 

 antennae 6-articulate, scape obconical, not 

 thickened ; joints 3-5 transverse ( <J ? ) - Psamathyomy^Deby. 



Wings normally developed, glabrous, with 

 the neuration of Cliinniomus; empodiuni 

 filiform, much ramified, i. c. emitting on 

 both sides branches that are themselves 

 divided into rami several times bifurcate, 2. 



2. Abdomen very strongly compressed, equal 

 in height everywhere ; anal segment ver- 

 tically truncate as far as the middle, 

 thence obliquely as far as the base, where 

 there are two cerci. Head with two carinae 

 extending from the hind border to near 

 the antennae, hardly convergent in front 

 and nearing almost the edge of the eyes ; 

 1st palpal joint obliquely truncate at the 

 distal end and nearly at right angle with 

 the 2nd ; antennal joints 2-5 transverse. 

 6th long, conical, bearing at the base a 

 verticillate bunch of 5 or 6 hairs shorter 

 than the thickness of the bunch, which is 

 also the case for 2-5 ; tarsal joints 2-4 

 obconical, cordiform at the distal end 

 which bears short and simple hairs inter- 



* < Ann. S. Afr. Mus./ x, 1914, p. 259. 

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