THAXTER. - 



MONOGRAPH OK TII10 LA MOU LUKN I A( 'EA<) 



133 



The type of (liis genus, B. roatratua, was formerly included in ('rrnlovn/rr.i but, as I have pointed 

 out below under the last mentioned genus, there can he no question as to the advisability of separating 

 the three well marked species here enumerated in a group by themselves. As the venter of the peril he- 

 cium develops, the whole base of the appendage becomes incorporated with it, as well as the basal cells 

 of its lower branches, which actually, in the end, form a portion of the perithecial wall, and seem to arise, 

 as is shown in Plate LXVIII, lig. 5, from wall-cells above the base of the main appendage. The neck, 

 or trunk-like prolongation of the perithecium is most characteristic, and at maturity becomes abruptly 

 reflexed in all the species, while in the two described below, it is further peculiar in possessing tooth-like 

 outgrowths below the curvature. The known species all inhabit water beetles belonging to the IIv- 

 diophilidse, and have been found in North America and Oceanica. 



Rhynchophoromyces elephantinus nov. comb. Plate LXVIII, fig. 5. 

 Ccr atomy ccs elephantinus Thaxtcr. Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 110. Apr., I !!()(). 



Faintly tinged with pale amber-brown; the neck stout, its upper three fifths (more or less) abruptly 

 recurved: certain corresponding cells of two opposite rows just below this curvature producing broad 

 rather short, blunt, tooth-like outgrowths, one to two or three to four, usually, in each group, or sometimes 

 solitary from one group only; the tip snout -like, broad, slightly and irregularly sulcate. Receptacle 

 consisting of from seventeen to twenty-two squarish or flattened cells, sometimes hardly broader distally. 

 Appendage producing numerous long slender flexuous branches repeatedly branched. Perithccia, asciger- 

 ous part, about 140 X 65 ft, the neck to recurved part 475-525 p.; recurved part 390-400 p. Spores 

 70 X 3.5 p. Receptacle 370-550 p. Longest branch of appendage 600 fi. 



On legs of Hydrobius (?) sp., Eustis, Florida. 



This very striking species is closely allied to R. denticulatus, but differs in general form and size, 

 and especially in the number and character of the tooth like perithecial appendages or outgrowths. 

 The accompanying figure shows the posterior view of an individual, the cells in the median line above 

 the receptacle corresponding to the base of the appendage, and the upper cells cut off from this row 

 corresponding to the main basal branches of the appendage. The host, a rather large hydrophilid, 

 possibly Hydrobius sp., was found swimming in rain pools in the pine woods near Lake Eustis. 



Rhynchophoromyces denticulatus nov. comb. Plate LXX, fig. 1. 

 Ceratomyces denticulatus Thaxter. Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 4-15. April, 1000. 



Amber-brown, the ascigerous portion of the perithecium slightly inflated and rather abruptly dis- 

 tinguished from the elongate neck, which at maturity is straight or slightly sinuous; the cell rows contain- 

 ing about fifty-five cells, the neck more slender toward the base, distally somewhat broader; successive 

 cells in two adjacent rows in this broader portion projecting to form well marked rather slender tooth-like 

 blunt outgrowths, directed obliquely upward and separated by a basal septum, one series usually con- 

 sisting of five cells, sometimes six, the cells immediately below often bulging prominently or forming 

 shorter tooth-like outgrowths; the second series consisting of usually not more than three well defined 

 similar tooth-like outgrowths: above these two series the upper fifth (about) of the neck is bent abruptly 

 backward, lying nearly parallel to the portion below it; the tip broad snout-like, the lip-cells forming a 

 small papillate prominence above and external to a broad rather distinctly differentiated cell, which 

 terminates one of the inner rows, and is almost as large as the lip-cells taken together. Receptacle rather 

 slender, tapering toward the base, consisting of (about) ten superposed cells, exclusive of the foot-cell, 

 which is not always wholly blackened. Appendage as in C. rostratus, the numerous branches and branch- 

 lets rather slender, not very long, forming a rather compact tuft more or less appressed around the base 

 of the perithecium. Perithecium, ascigerous portion about 85 X 35-40 //, neck to recurved portion 

 475-500 X 20-25 p, recurved portion about 125 p, tooth-like projections 15-35 X 6-7 p. Receptacle 

 (ten superposed cells) 130-150 p. Appendages (longest branches) 175 X 3 p. 



On under surface, of a small hydrophilid beetle, Paris Mus., No. 11, Isles Mariannes, Oceanica. 



