272 



MONOGRAPH OF THE 



L ABOU LBENI ACE^E. 



consisting of a squarish basal cell followed by a somewhat larger sub-basal cell, almost the 

 whole of which becomes divided into numerous small cells to form the antheridium proper, which 

 is bordered internally by a narrow sterile cell above which the appendage becomes repeatedly and 

 variously branched ; the branches seldom extending beyond the middle of the perithecium. 

 Spores, 25 x 3.5 fi. Perithecia, 90-130 x 33-55 ft, average, 114 x 42 fi. Total length of appendage, 

 90-180 fj,, average, 150 fi. Total length to tip of perithecia, 200-370 /x, average, 280 ft. 

 On Bledius assimilis, Champaign, 111. 



I am indebted to the courtesy of Prof. S. A. Forbes for abundant material of this species, 

 kindly sent me from the locality mentioned. A single undetermined species of Bledius, from 

 northern Illinois in the Museum of Comparative Zoology, was also found infested by the same 

 parasite ; but no fresh material has been available for examination. The species varies very 

 considerably in size ; and forms in which the sub-basal cell is blackened might be mistaken for 

 a distinct species, owing to the slight distortion which accompanies the discoloration. It 

 occurs on all parts of the host, even the legs and antenna?. A species bearing some resem- 

 blance to the present form was also found on a species of Ancyrophorus from Lake Superior ; 

 but the two specimens examined are not sufficiently perfect to warrant their description, 



Cantharomyces occidentalis Thaxter. Plate VII, figs. 15-16. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 161. 



More or less suffused with brown. Perithecium rather short, sub-conical, slightly inflated 

 toward the base ; the distal portion very slightly curved outward, the apex bluntly pointed ; 

 stalk-cell large, cylindrical, not exceeding the antheridium ; basal cells each several times as long 

 as broad. Basal cell of receptacle very small, the sub-basal cell much larger, inflated without 

 blackening, or externally and inferiorly deeply blackened and slightly incurved. Basal cell of 

 the appendage similar to the distal cell of the receptacle, larger and unmodified, or similarly 

 blackened ; the sub-basal cell large, its upper inner portion obliquely cut off and divided into 

 numerous small cells to form the antheridium, which bulges slightly on the inner side ; the ap- 

 pendage terminated by several superposed cells. Perithecium, 96-100 x 60 \x. Stalk-cell of per- 

 ithecium, 120-140 x 26 fx. Length of appendage to tip of antheridium, 110-150 fi. Total length 

 to tip of perithecium, 280-335 /j,. 



On Bledius armatus Er., Utah. 



Distinguished from C. Bledii by its brown color, the greater elongation of the basal cells of 

 the perithecium, and the relatively small antheridium, which in C. Bledii is external and com- 

 prises five-sixths to three-quarters of the sub-basal cell. The two specimens examined have each 

 a single perithecium, and but one appendage, the tip of which is somewhat broken. A number 

 of young specimens apparently belonging to this species, and occurring on B.jacobinus Lee, have 

 the terminal portion of the appendage unbranched and consisting of a short tapering series of 

 superposed cells. 



The figures given represent the two type specimens which were found on the abdomen of the 

 host. 



