NEW DIMORPHOMYCETEAE. 271 



overlapping the small subbasal cell which appears to produce a branch 

 to the right and left; the two similar, rather closely septate, often 

 broader distally, curved upward on either side of the one to several 

 perithecia; one, the secondary appendage, often slightly longer and 

 stouter, than the other, which represents the primary appendage, and 

 is subtended by the first perithecium; a second usually developing 

 from the basal cell of the secondary appendage, accessory perithecia 

 not infrequently arising from cells adjacent to those which produce 

 the first, seldom more than four maturing. Perithecium asymmetrical, 

 irregularly fusiform, the stalk-portion relatively short and tapering 

 to its narrow insertion, not distinguished from the gradually much 

 broader ascigerous portion, which is slightly bent inward distally, 

 strongly convex externally and straight or concave on the inner side 

 below the tip; the apex often bent rather abruptly upward, broad, 

 flat or blunt. Perithecia 55-75 X 13 m- Appendages 30-48 X 6-7 ^i. 

 Total length to tip of perithecium 70-92 ix. 



On the elytra of Tomarus afotuarius Sharp. No. 1527, Columbus, 

 Ohio; No. 1609, Los Amates, Guatemala; No. 1599, El Rancho, 

 Guatemala. 



The hosts bearing this parasite were collected for me by the late 

 Professor Kellerman to whose kindness I am indebted for numerous 

 other new and interesting forms. The species is nearly allied to D. 

 Tomari, from which it differs especially in the form of its perithecia 

 and appendages. Although in specimens which bear two or more 

 perithecia, the general development appears to be more or less bi- 

 laterallv svmmetrical, the structure does not seem to be fundamentally 

 different from that of other species of the genus. The presence of 

 adventitious perithecia might be compared to the much more striking 

 phenomenon seen in D. adveniitiosus, while the development of short 

 branches bearing antheridia finds an occasional parallel in B. Thaxteri. 

 The males adhere so closely to the base of the female that they can 

 only be separated with the greatest difficulty, and but few ha\e been 

 clearly seen. The antheridium is not typical, the neck being hai-dly 

 developed at all, and the antheridial cells but two in number, as far 

 as it has been possible to determine. The antherozoids hardly seem 

 to enter a common tube, but rather to make their exit directly from 

 the neck of the antheridial cell. They are so small, howe^"er, and the 

 outlines are so vague, that a definite determination of these points 

 has been impossible. 



