368 



THAXTER. MONOGRAPH OF THE LABOULBENIACE^E. 



On Pericolitis gutattus Chev., Paris Museum, No. 78; Brit. Mus. No. 571; Hope Collection, No. 

 301, Java; Sharp Collection No. 1202. On P. flavoguttatus Dej., E. Indies. Hope Coll. No. 279, Type 

 On elytra. 



This very peculiar species is well characterized by the unique modification of the tip of its perithecium, 

 which looks like a pair of mandibles. The more slender of the two projections varies somewhat in length, 

 and is not always as erect as is represented in the figures, and the whole tip sometimes has the slightly 

 bulbous habit indicated in fig. 13. The branches of the inner appendage may be erect, as in fig. 13, or 

 strongly divergent on either side, as fig. 12, which also shows the appearance of the fully matured and 

 nearly opaque individual. The species is most nearly allied to L. separata and L. corethropsis. 



Laboulbenia forficulata Thaxtcr. Plate LIX, figs. 9-11. 

 Proc. Am. Acad. Aits and Sd., Vol. XXXV, p. 178. Dec, 1899. 



Perithecium free, straight or someAvhat curved, slightly inflated, brown except the basal wall-cells 

 which form a mostly hyaline well developed narrow neck-like stalk less than one third as long as the 

 ascigerous portion, the latter tapering rather abruptly at the tip, two of the lip-cells prolonged to form a 

 pair of erect pointed hyaline symmetrical apposed outgrowths which resemble the tips of a pair of shears. 

 Receptacle short, stout, subtriangular, cell I hyaline below, forming a short slender usually curved pedicel ; 

 the body of the receptacle deeply suffused below with blackish brown, the more deeply suffused portions 

 coarsely punctate with darker spots. The outer appendage consisting of a basal cell from the blackened 

 upper and outer margin of which arise usually three branches in an antero-posterior series, which are 

 curved slightly outward and give rise from their convex side to secondary branches which in turn may 

 bear branchlets in a similar fashion: of the primary branches the inmost is more copiously branched, the 

 outmost being small, usually broken; all the branches black externally and brown on the inner margins, 

 or wholly opaque, usually constricted on the inner side at the blackened septa, the terminal cells of some 

 of the ultimate branchlets abruptly inflated at the base: the basal cell of the inner appendage gives rise 

 to a branch on either side, the two divergent and very similar in character and mode of branching to 

 those of the outer appendage. Perithecium exclusive of neck, 150-200 X 28-38 jx; the neck 35-50 [i 

 long. Total length to tip of perithecium 300-450 /x; to insertion-cell 100-150 /_*; greatest width 50-70 /x. 

 Appendages 175-200 /i. 



On Thyreoptems striatus Guer., Hope Collection, No. 302, Madagascar. On elytra. 



This species is very closely allied to L. imitans in its general form and the character of its appendages, 

 and is also the nearest known relative of the two large species, L. pahncUa and L. Kunkcli which occur 

 on the allied Mormohjcc. It is distinguished from all other species by the shear-like tip of its perithecium. 

 The material is scanty and the appendages are badly broken in all the adults. Whether the flask-like 

 terminations of the inner appendages represented in fig. 9 arc sterile extremities, or peculiar antheridia 

 I am unable to determine, although I am inclined to the former view. 



Laboulbenia palmella Thaxtcr. 

 This species has been obtained on Mormolyce phyllodes in the Brit. Mus. No. 550, Ding Ding Is. and 

 No. 55Gb, Penang, and in the Berlin Museum No. 975a, Sumatra, on the same host. It appears to be 

 constant in its characters and always separable from the much larger L. Kunkelii, which has been again 

 observed on the inferior surface of a specimen of M. phyllodes from Sumatra in the British Museum, No. 

 556. 



Laboulbenia corethropsis Thaxter. Plate LIX, figs. 3-6. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 168. Dec, 1899. 

 Perithecium relatively large, translucent brown or yellowish brown, generally larger distally through 

 a subterminal external bulge, the tip moderately well differentiated, often bent rather abruptly inward, 

 wholly blackish brown or hyaline in the median line, the inner lip-cells smaller and usually more promi- 

 nent than the outer, sometimes overlapping them, the whole perithecium free from the receptacle. Recep- 



