80 COi!?TEIBUTIO]S"S TO SOUTH-AFRICAX BOTANY. 



Somerset East, MacOwayi 521 ; CafFraria, in bumidis clivia montis 

 Baziya, alt. 2000 pad., flor. Mart. Apr., Baur 151 ! 



The species is allied to D. Cooperi^ Harv. Thes. Cap. ii. t. 172 *; 

 and raust also be allied to D, stenoplectroTiy'Reichh. f. (which the 

 author says is very near to _D. Cooperi^ Harv.), but differs from 

 that by its galea being cucullate, not fornicate, and obtusely acute, 

 not acuminate; also by the posticous lobe of its labellum being 

 narrower, not wider, than the auticous lube. In this species, as 

 in D. secunda^ i>. cuciillata^ the apex of the anterior lobe of the 

 labellum is closely fitted to and under the apical point o£ the 

 galea. 



DESCRIPTION OF PLATE I. 

 South-African Orchids. Floral parts of species of Disperis. 



A. Figs. 1-5. Disperis TVeolii, Eeich. f. 



B. „ 6-12. oxyglossa, Bolus, n. sp. 



C- „ 13-17. Macowani, Bolus, n. sp. 



D. „ 18-22. Woodii, Bolus, n. sp. 



E. „ 23-27. namaqxtensis, Bolus. 



F. ,, 2S-33. Tysoni^ Bolus, n. sp. 



The figures are numbered consecutively in the Plate, but the following small 

 letters apply similarly to each species : 

 a. Galea, or back sepal, side view. 



h. Side sepal, front view. | 



c. Side petal, side Tiew. 1 Enlarged 3 diameters. 



d. Labellum, side view. ^ 



e. Ditto, front view. Enlarged 6 diameters, except in D. oxy 

 /. Ditto, front oHique view. } 9^osm, y^hioh are x3 diam., and 

 g. Ditto, in front and from above. J ^- ^^*'"""' ^^^^^ ^''« ^^ ^'^'^- 



In the side petals the median nerve shows the line of attachmeut to the galea ; 

 the anterior or free portion is generally marked by coloured spots ; iu J), oxy- 

 fflossa it is to the right ; in D, Wealii to the left. 



Kearly all the figures are drawn from dried specimens of actual types. In 

 the case of J), oxyglossa^ figs. G, 8, 9, 11, and 12 are drawn from Tyson's plant 

 No. 1603, and figs. 7 and 10 from Baur's specimen No. 813. In fig. 9 tlie 

 claw is straightened out iu a line with the limb ; and in fig. 10 it is shown more 

 in its natural position, although the limb is flattened out, not arched, as it 

 would be when iu its natural position. 



Figs, 23-27 {D, 7ia maquetifiis) are drawn from living specimens. Fige. 2S- 

 33 {D. Tysoni) have been drawn from flowers preserved in spirit, viz. specimens 

 of Tyson*9 No. 1079, which were compared by me, and found to agree with 

 specimens of MacOwan's No. 52!, which had been marked '* U. Cooperi, Harv./ 

 by Prof. H. G. Reiehenbach. Fig. 33 is viewed from above, the anterior lube 

 being pulled down to show the upper surface. 



[* The flowers of B. Cooper?\ Ilarv,, are twice as large, and not nearly ao 



numerous, as those of Mr. Bolus's new species D- Tyso7ii. — N. E.. Bkows.] 



