154 Proceedings of the Biological Society of Washington. 



lobus terminalis porrectus, late oblongus, rotundatus, margine minutissime 

 ciliato; discus inferne callis binis latis serailunatis crassis ornatus. Colum- 

 na in alam latam tridentatam extensa. Anthera pileata, membranacea. 

 Pollinia duo, pyriformia, complanata. 



The elongated rhizome and small flowers distinguish this species from its 

 allies. From Scaphosepalum Pittierii Schltr. it differs in having long, 

 creeping rhizomes and a dorsal sepal that is not dilated above. The 

 acuminate petals and distinctly trilobed labellum are also important 

 differentiating characters when comparisons with »S'. Pittierii are made. 



PANAMA, Province of Chiriqui. Humid forest of the Cordillera, 

 east of the Rio Caldera, Killi-p 3567, February 17-19, 1918. 2,000 meters 

 altitude. 



Scaphyglottis laevilabium, sp. nov. 



Herba epiphytica, erecta vel patens, circa 10-17 cm. alta, rhizomate 

 valde abbreviato. Radices numerosissimae, densae, ramosae, glabrae, 

 fiexuosae. Pseudobulbi circa 3 superpositi (2-4), congesti basi pluriarticu- 

 lati, anguste fusiformes vel cauliformes, pseudobulbo infimo nunc bi- vel 

 trifurcato, articulis nunc radices ferentibus, in sicco valde longitudinaliter 

 sulcati vel striati, pseudobulbi infimi plus minusve 5 cm. longi, plus minusve 

 3 mm. crassi (usque ad 7.5 cm. longi et 1 mm. crassi). Folia anguste 

 linearia, apice rotundata, minute bilobata, basi conduplicata, leviter 

 angustata, plus minusve 5 cm. longa, 4.5 mm. lata, tenuiter coriacea, nervo 

 medio supra sulcato, subtus carinato. Flores saepissime duo ut videtur, 

 ex apice pseudobulborum exorientes, ovaria pedicellata vaginis scariosis 

 arete imbricantibus omnino obtecta. Segmenta perianthii membranacea, 

 patentia. Sepala lateralia linearia vel oblongo-linearia, apice dorso carin- 

 ato acuta, basi leviter angustata et columnae adnata, circa 7 mm. longa et 

 1.75 mm. lata. Sepalum dorsale simile, gynostemio altius adnatum, 

 oblongum, parte libera 6 mm. longa et 1.65 mm. lata. Petala multo 

 angustiora, linearia, cum sepalo imparl columna alte adnata, abrupte 

 acuta, circa 5.8 mm. longa et .9 mm. lata. Labellum positu naturali ungue 

 convoluto, expansum ex ungue crassiore in laminam laevam sensim dila- 

 tatum, in circuitu oblanceolatum vel spathulatum, circa 7 mm. longum, 

 3 mm. latum trans dimidium anteriorem, prope apicem obscurissime 

 trilobatum, apice late truncato-retusum, marginibus anterioribus erosulis. 

 Gynostemium conspicuum, prope stigma brachiis binis triangularibus 

 ornatum, ad basim sensim paulo dilatatum, basi ipsa caverna praeditum. 

 Anthera semiglobosa. Pollinia ut videtur quattuor. 



Related to Scaphyglottis guatemalensis Schltr. which is distinguished 

 from it by means of smaller flowers, a carinate labellum and an ebrach- 

 iate column. S. Cogniauxiana DeWilld. is set apart from S. laeoilabium 

 by its simple labellum. 



PANAMA, Province of Panama. Two miles east of Juan Diaz, 

 Killip 3113. October 2, 1917. 60 meters altitude. On branch of tree in 

 dense forest. 



Bussey Institution, Harvard University. 



