ORCHIDACEiE 



most flowers of the raceme and the uppermost leaf. In Schlech- 

 ter's type specimen the peduncle is about 3 cm. long between 

 the raceme and the leafy portion of the stem and in my speci- 

 mens exhibits an extreme range of 3-4 cm. In the type of E. 

 purpurea the part of the peduncle that extends between the ra- 

 ceme and the leaves is 13.5 cm. long and in duplicates of the 

 type number preserved in the United States National Herba- 

 rium it is 12-13.5 cm. long. Aside from habital differences there 

 are other reliable guides to aid one in distinguishing between 

 these species, one of the most important being the calli that are 

 found on the anterior wall of the sac alternating with the three 

 main nerves. In E. argyrosticta these calli are four elongated 

 ridges, hardly thickened at the free basal tip, the two outer ones 

 about 1 mm. long, the inner ones equally long but so situated 

 that they extend nearly to the base of the sac. In E. purpurea 

 there are also four ridges on the anterior wall of the sac, but they 

 are more or less thickened and papilliform at the basal tip and 

 in the type do not form such distinct carinae or raised lines as in 

 E. argyrosticta. In both species the sepals are provided exter- 

 nally with four or five-celled hairs, but in E. purpurea the hairs 

 are more or less localized as tufts near the tip, only a few scat- 

 tering ones occurring elsewhere. 



Erythrodes bicolor {Rodr.) Ames covib. nov. Physurus bi- 

 color Rodr. Orch. Nov. 2 (1882) 290. 



Erythrodes bifalcis (Lindl.) Ames comb. nov. Physurus bi- 

 falcis Lindl. Gen. & Sp. Orch. (1840) 502. Microchilus bifalcis 

 n. Dietr. Syn. PI. 5 (1852) 166. 



In Lindley's herbarium at Kew the flower of this species is 

 shown by a rough sketch to have extraordinarily large falcate 

 lobes at the end of the labellum. The spur is very long and slen- 

 derly cylindrical. 



[67] 



