410 THAXTER. — MONOGRAPH OF THE LABOULBENIACE.E. 
Laboulbenia Guerinii Robin. 
Sufficiently abundant material of this species has been examined from a variety of localities including 
spec hums on Gyrrles miceus in the Paris Museum collected in Venezuela, if I recollect aright, by Guerin- 
Meneville, from whom the original material of L. Guerinii was obtained, so that there can be no doubt 
as to the accuracy of my former reference of the North American forms on Gyretes to this species, despite 
the fact that, as in the case of L. Rougctii the plant does not agree in all particulars with Robin's account 
and figures. The species is in general constant in its characters, the most striking departure from the 
usual form occurring in the specimens of G. ductus in the Berlin Museum, the locality of which, Rio 
Janeiro, was doubtful, according to my memoranda. These specimens vary from the type in the consid- 
erable elongation of cell II, which is quite hyaline and contrasts with a deep brown distal suffusion of cell I. 
Specimens have been examined from the following sources: Hope Collection: No. 227 on Gyretes 
sp., Mexico: No. 228 on (7. ductus Germ., Brazil. Paris Museum: No. 105 on Gyretes sp., Arauca, 
Venezuela; Nos. 97 and 104 on G. sericeus Lab., U S. America" and Venezuela; No. 107 on G. ductus 
< rerm., Brazil. British Museum: No. 468 on G. pulverulent us Sharp, Columbia; No. 771 on G. acutangulus 
Sharp, Bugaba, Panama; No. 770 on G. proximus Sharp, Costa Rica; No. 769 on G. Guatemalensis 
Reg*, Paso Antonio, Guatemala; No. 767 on G. minor Reg., Torola, Mexico ?; on G. Borcandri Chev. 
Mexico. Sharp Collection: No. 1080 on G. leionatus Duby, Mexico; No. 1078 on G. sericeus Lab., 
Cameras, Venezuela, U. S. National Museum; on Gyretes sp., Texas. Berlin Museum: No. 800 on 
G. rinctui Germ., Rio Janeiro ?; No. 801 on G. dorsalis Brulle, Brazil; No. 802 on G. immarginatas, 
Mexico; \'o. S03 on 0. pruinosus Sharp, Columbia. 
Laboulbenia drepanalis Thaxter. Plate LXVII, figs. 5-6. 
Proc. Am. Acad. Arts and Set., Vol. XXXV, p. 173. Dec, 1899. 
Perithecium smoky olive, the inner half or less usually mueh paler, the upper three fourths free, fal- 
cate; the inner margin concave, the tip undifferentiated, the lip-edges forming a small hyaline rounded 
abruptly distinguished papilla. Receptacle rather short, concolorous with perithecium; cell I paler or 
hyaline with a basal blackish suffusion; cell V large, growing upward above the oblique insertion-cell 
which is thus pushed out free from the perithecium together with the basal cells of the appendages. In- 
sertion-cell small, unmodified. Basal cells of the appendages closely united, and finally indistinguish- 
able from one another, forming a prominent rounded outgrowth which gives rise to about six or eight 
branches, their dark basal septa of variable diameter only remaining, as a rule; the basal cells of the 
branches are distally inflated, and bear several branchlets externally and terminally, the basal cells of 
the branchlets mostly similar to those of the primary branches and similarly branched, the ultimate 
branchlets closely septate, the septa dark. Perithelia, Panama specimens 100 X 40 ft, Amazon 140 
X 35 } t. Total length to tip of perithecium, Panama 210 ft, Amazon 275 ,u; to insertion-cell, Panama 
1 >0 /i, Amazon 140 /t 
On Gyrcte* acutangulw, Sharp, I5rit. Mus. No. 771 (Biologia Coll.), Bugaba, Panama; on Gyrcks 
!»., Bnt. Mus. No. 477, Amazon. On mid-elytron. 
This species is distinguished from others of the same section by its falcate perithecium and small 
prominent insertion region. Specimens from Panama differ from the Amazon material, which is taken 
as the type (fig. 5), in their smaller size and darker color; but are not otherwise essentially distinguished. 
* S ill so many of the aquatic forms, the appendages arc either badly broken or wholly wanting in the 
specimens examined. 
ABOULBENIA heterocheila Thaxter. Plate LXIV, fiV. 16. 
Am 
Dec, 1899. 
dist, \W rtTT 0l : Ve ; br0W i n ' United t0 <* B IV nearly to its base, rather short, inflated below, tapering 
of h , tw P , UP •" differentiated > blackened below, the four lip-cells all differently modified: 
IWP mner lips one produces an erect rather slender brown finger-like terminal outgrowth, the other 
