THAXTER. —MONOGRAPH OF THE LABOULBl MAC I 1 
are associated on a single individual and the material examined has been so aliuiiclanl thai it > ins hardb 
probable that there is ever more than one type in a given individual. 
In the Sharp CoQection a specimen of Vhihnthm labeled "P. vantmsl Victoria, Australia, 
parasitized by a form closely related to the present, if not identical with it, but the s|>ecini» n in too much 
broken to render an accurate determination possible. As far as has hcen definitely determined th< host 
is always P. wnbratilis, a rather large species with dark secondare 
Dichomyces ixsiGNiB Thaxter. Plate XXXII, fi: . : (». 
Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 421. April, IttO, 
Basal cell suffused with reddish brown or partly hyaline; the lower tier wholh opaque or translue* lit 
along the median line; the middle tier consisting of about thirteen to se> nteen cells, exclusive of (In. . 
which are indistinguishable in the slender fork-like prolongations which extend on cither side higher than 
the middle of the upper tier, the margin broadly blackened, continuous with the 0|>a<juc margin of tin 
lower tier; the lower portion of the three to five median cells marked by a fcl large attered transver ■ ly 
elongated brown patches which merge on either side into the opacity of the marginal cells; anthcridia 
very large, the venter slightly inflated, the neck sharply pointed, conical, brown, often abrupth limit- 
ing, three to five of the cells immediately external to them bearing normal brownish app< ud je.s: distal 
tier very large subtriangular, distally concave, consisting of from twenty-nine to thirty-nine narrow and 
elongated cells and bearing from four to eight perithecia with some irregularity; th« appendages brown- 
ish, paired above the subtending cell, not as long as the perithecia. Peritl ia relatively small, purplish 
brown, tapering almost continuously from the broad base; the tip moderately Well distinguished, the 
posterior lips prolonged to form long nearly straight and horizontal slightly inflated apj>endag« s which 
project from the tip on either side; the anterior lips forming the truncate apex, which consist- of two 
distinct lateral projections With an intervening convex portion having a median apiciiltis, Pcrith< ia 
about 85 X 30 /i, appendages from tip to tip 35-39 pu Anthcridia 50 X 11 "■ Receptacle 800 810 X 
200-230 pu Total length to tip of perithecium 37.5-400 pu 
On an undetermined staphvlinid collected by A. K. Wallae. at Sarawak, Borneo, Hope ColL No. 218, 
The largest and finest species of the genus, sometimes even larger than the type represented in fig. o. 
The perithecia diverge somewhat from the plane of the upper tier and thus seem in the figure* somewhat 
shorter relatively than they really are. No indication was seen in the material obtains I of the occur- 
rence of a second type of perithecium. The figure given of the antheridium H only intended to siifjj 
its structure, the outlines of the antheridial cells being too confused to draw with exactness. The au- 
theridial cells appear to arise from more than one basal cell. 
Dichomyces bifidus Thaxter. Plate XXXII, figs, 1 1 16. 
Proc. Am. Acad. Arts and Sci., Vol. XXXVII, p. 2& June, L90L 
Basal cell slightly enlarged, pellucid, tinged with brown, about as long as broad: the lower tier, 
and more or less of the middle tier, opaque; the marginal cell of the latter forming a bluntly rounded, 
sometimes almost obsolete projection on either side, hardly extending above the ven r of tto boil tout, 
short-necked anthcridia: the upper tier relatively large, more Off less en cnt-shapcd according to the 
degree of lateral development, edged externally with blackish brown, mow broadly beta tin brown 
area punctate; the cells about thirty-one in the larger individuals, the marginal one- forming a i her 
slender series, which may curve abruptly upward nearly to the middle of the perithecia, or aasttm i 
hecigerous area horizontal, producing normally four peritl da, thn< 
►wn middle ones and one between each of the others, the external ceils 
pen 
be 
length 
yellowish brown, conspicuously tinged with purplisl 
i 
perfectly 
rge ear-like app« nda_ 
tapers to a pointed apex 
