390 



THAXTER. — MONOGRAPH OF THE LABOULBENIACE^E. 



90 (i, average 275 X 60 a. Receptacle very variable. Total length to tip of perithecium 425-1480 //; 

 to insertion-cell 275-1200 fi. Appendages, longest 000 /i, average about 400 it. 



On Trichognathus marginipennis Latr., Hope Collection, No. 267, Columbia, Brit. Mus. No. 525, 

 "Tamaz," S. America; on " T. marginata Latr." Brit. Mus. No. 526, Brazil: Hope Collection, No. 266, 

 "S. America"; on Trichognathtis sp. indet.: Paris Museum, Nos. 70, 71, and 135, Venezuela and "S. 

 America." Berlin Mus. No. 955 on T. immarginatus, Columbia; No. 957 on T. cinctus Chaud., ( 'aracas, 

 Venezuela. On all parts of host. 



This species appears to be a decidedly variable one, not only in size and coloration, but in the devel- 

 opment of its appendages. It is the only species of the section in which the cells of the inner primary 

 appendages may show a secondary proliferation which results in more than the normal single series of 

 appendiculate cells. This proliferation gives rise to variably developed secondary series of appendicu- 

 late cells, each of which bears its branch; so that where this phenomenon is pronounced, the inner 

 appendages, as a whole, give rise to a dense tuft of very numerous branches; especially noticeable in 

 the material on the Paris specimen, No 135, from Venezuela. Although the ordinary form, in which the 

 inner appendages consist, as usual, each of a single series of obliquely superposed appendiculate cells, 

 this simpler form may be associated on the same host with others in which a greater or less degree of 

 complication has resulted through the proliferation above referred to. In the simpler type, the branches 

 tend to be more or less constant, with two basal cells usually little, or not at all, inflated, and distinguished 

 by blackened septa; but in the proliferous conditions, especially, this distinction is more or less lost; 

 the number of blackened septa varying very considerably, as is indicated in fig. 2. The antheridia are 

 normally paired, dark, and borne on a rather long single stalk-cell. Small specimens of this species are 

 not unlike certain individuals of L. Helluomorphae, or even of L. triordinata; the essential differences 

 of which are pointed out under these species. It is apparently not uncommon on its host, which is a 

 carabid allied to Galerita and Brachinus. 



Laboulbenia abunca Thaxter. Plate LXII, figs. 7- 9. 

 Proe. Am. Acad. Arts and Sci., Vol. XXXV, p. 1.54. Dec, 1809. 

 Perithecium long and slender, straight or nearly so, the outer half clear dark translucent brown, the 

 inner pale olivaceous, wholly free, a short well distinguished hyaline neck formed by the basal wall-cells; 

 the tip well distinguished, wholly blackish below or especially on the inner side, the inner lips black- 

 margined, curved outward completely over the outer lips in a characteristic hook-like fashion. Receptacle 

 uniform dirty olivaceous, cell I paler, the cells above it faintly punctate. Insertion-cell black, broad, 

 indistinguishable from the blackened basal portions of the basal cells of the appendages. Outer appendage 

 consisting of a very large externally rounded basal cell, becoming wholly blackened, except its upper margin, 

 and surmounted by a series of usually six superposed hyaline cells which is curved toward the perithecium, 

 each cell producing externally a single simple branch consisting of a basal portion made up of two roundish 

 short cells constricted at the dark septa, and a distal portion six or more times as long, tapering, hyaline 

 or tinged with brownish; the inner appendages consisting of basal cells wholly or almost wholly black, 

 giving rise on either side to a short series of cells, usually three or four, similar to that of the outer append- 

 age and similarly branched. Perithecia 225-245 X 40 p. (including neck, which is about 18 p. long). 

 Total length to tip of perithecium, average 450 /z; to insertion-cell 200 fi, greatest width 50 /z. Appendages 

 150 p. 



On Galerita unicolor Dej., Brit. Mus. No. 516, Amazon River. Inferior surface of prothorax. 



This species is distinguished from L. geniculata, to which it appears to be most nearly allied, by the 

 peculiar conformation of the tip of its perithecium, as well as by the color of the latter, which is evenly 

 suffused in the last mentioned species. The externally rounded basal cell of the outer appendage and 

 the general suffusion and punctation of all the cells of the straight receptacle, above cell I, serve further to 

 distinguish it. 



