344 



THAXTER. MONOGRAPH OF THE LABOULBENIACE.E. 



or with the basal wall-cells nearly hyaline. Receptacle slender, bulging slightly at the base of the perithe- 

 cium, cell II narrower distally than cell I, the base of which is hyaline. Outer appendage consisting of 

 a basal cell several times as long as broad, hyaline, externally suffused, usually curved strongly outward, 

 constricted distally at the deeply suffused septum, the subbasal cell abruptly narrower and shorter, usually 

 terminated by two branchlets, the outer distinguished by a dark septum. Inner appendage consisting of 

 a small basal cell bearing a short branch on either side, distinguished by a blackened septum, simple or 

 once branched, usually not longer than the pcritheeium. Perithecium 120-140 X 35 /(. Total length to 

 tip of perithecium 340-470 p; to insertion-cell 220-300 p. Appendages (longest) 400 p. 



On Copfea armafa Lup., Brit. Mus. No. 595, Santarem, Amazon River, Brazil. On elytra and 

 superior prothorax. 



This species is readily distinguished from allied forms by the blackened septa which separate the 

 basal cell of the inner appendage from its branches, a condition seen in no other species of the same gen- 

 eral type. The types are in good condition and show little variation. 



Laboulbenia bidentata Thaxter. Plate LOT, figs. 18-20. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 161. December, 1899. 



Uniformly pale dirty brown. Perithecium rather darker, free, except at its base; somewhat inflated 

 below, tapering symmetrically from the extremity of the basal wall-cells to the rather narrow apex; the 

 two inner lip-cells suffused with blackish brown and projecting beyond the others to form two blunt promi- 

 nences, their tips hyaline, contrasting. Receptacle rather short and stout, uniform pale dirty brown, 

 inconspicuously striate punctate with minute somewhat darker points, the lower part of the small basal 

 cell mostly hyaline. Outer appendage consisting of a basal cell several times as large and long as that of 

 the inner, giving rise to an inner (lower) and an outer branch the latter distinguished by a horizontal black 

 septum, its basal cell somewhat rounded and giving rise distally to an outer and an inner branchlet, each 

 commonly once branched, the outer deeply blackened at the base (usually broken): the inner appendage 

 consisting of a basal cell which bears a branch on either side which may be twice branched, hyaline, bear- 

 ing solitary antheridia laterally. Spores 50 X 4 p. Perithecia 115-130 X 45 p. Total length to tip of 

 perithecium 220-270 p; to insertion-cell 135-150 p. Greatest breadth 70 p. 



On elytra of Homothis sp., St. George's Sound, Australia, Hope Coll., No. 309. 



Although this species appears at first sight to be a very ordinary type of the polyphaga group, the 

 conformation at the tip of the symmetrically inflated perithecium, due to the peculiar form of the lip-cells 

 is quite unlike that of any other species, and serves as an absolute distinction. 



Laboulbenia pedicillata Thaxter. 

 Specimens of the short stout form of this species have been obtained from Bembidium nigrum Dej.> 

 South America, in the Berlin Museum, No. 869; and a group of individuals, which I am unable to sepa- 

 rate specifically, was found at the tips of the elytra on a specimen of Dyschirius thoraeicus Rossi, from 

 Europe, in the same collection, No. 893. A figure of this form on Dyschirius is given on Plate LVT, 

 fig. 11. A somewhat more elongate form was also found on Dyschirius globosus Herbst, from England 

 in the Hope Collection, No. 349. 



Laboulbenia flagellata Peyritseh. 

 L. elongata Thaxter, Proc. Am. Acad. Arts and Sci., Vol. XXIV, p. 10, 1890. 

 There can I think be little doubt that the form which I have described as L. elongata should be re- 

 ferred to Peyritsch's species since, although I have as yet seen no specimens on species of Bembidium, 

 the form which generally occurs on European Anchomeni cannot be separated from the American mate- 

 rial. It appears to be the common type on Anchomeni the world over, and is subject even in its more 

 typical conditions to very considerable variations in form, size, color and in the characters of its append- 

 ages. A comparison, moreover, with the varied material which I have included under L. polyphaga 



