320 Piof. D. M. S. Watson on 



along the costal region ; Sc long, cell l.s/ M^ relatively 

 small, tending to be open by the atrophy of m ; cell M^ 

 lacking. 



Male. — Length 12 ram. ; wing 11 mm. 



Female, — Length 20 mm. ; wing 15 mm. 



Rostrum and palpi brownish black. Antennae short in 

 both sexes, black. Head brownish black, paler adjoining 

 the inner margin of the eyes. 



Thorax brownish black, sparsely dusted with brown. 

 Halteres and legs brownish black. Wings with a strong 

 brown tinge, the costal region more saturated, this intense 

 coloration including the costal and subcostal cells and the 

 radial region to the wang-apex; veins dark brown. Vena- 

 tion : ^c very long, Sc^ ending approximately opposite ?•, 

 Sc^ some distance from the tij) of 6c'i, the latter alone being 

 about equal to the deflection of i^4+5 ; Rs elongate, arcuated 

 at origin; cell Is/ M<], open or closed, m tending to be 

 evanescent; veins beyond cell Is/ ilfj very long and parallel; 

 cell M^ lacking; basil deflection of Cuy beyond the fork 

 of M ; Cu2 and the basal deflection of Cu^ subequal. 



Abdomen black with a brown pollen. Abdomen of 

 female relatively elongate ; valves of ovipositor elongate, 

 acicular, black, the apices of tergal valves horn-coloured. 



Hah. Cameroun. 



Holotrjpe., $ , Metet, 200 miles inland, east of Batanga, 

 June 20, 1918 {A. I. Good). 



AUotopotype, ? , in ccpula with type. 



Carnegie Museum, Accession No. 6317. 



Type in the collection of the Carnegie Museum. 



XXIX. — On the Coelacanth Fish. 

 By D. M. S. Watson, University College, London. 



For some years I liave been interested in Coslacanth fish, 

 becauj^e, although commonly included with the Osteolepids, 

 they differ from those forms in many respects, and have in 

 s me ways marked resemblances to the Teleosts. I therefore 

 investigated the structure of Macropoma in specimens partly 

 of my own, partly lent me by Mr. G. E. Dibley, F.G.S. 

 Whilst I was actually writing this paper I received from 

 Dr. E. A. Stensio a copy of his great work on the ' Triassic 

 Fishes from Spitzbergeu^ (Vienna, Adult Uolzhauseu, 1921), 



