CHITONOMYCES AND RICKIA. 21 



the cells asymmetrically placed with reference to one another, four to 

 twelve in each series; the upper cell of the anterior series protruding 

 abruptly beside the base of the ascigerous cavity: the posterior series 

 continued along the posterior margin of the perithecium nearly to its 

 apex ; these marginal cells, six to seven in numlier, successively smaller, 

 externally hardly convex, all of them usually cutting off distally and 

 laterally small appendiculate cells, except the basal and also the 

 subterminal cell, which is smaller than the terminal; the latter being 

 an appendiculate cell separated from it distally. Perithecia relatively 

 long and narrow; the anterior margin and the apex free, the latter 

 terminating in a well defined, erect, short, stout prolongation of one 

 of the inner lip-cells; the tip well distinguished. Base of the primary 

 appendage long and slender, arising externally from the third, fourth 

 or fifth cell above the basal cell of the receptacle. Spores about 

 30 X 3.5 n. Perithecia 00-60 X 14-18 /x, the marginal cells X 7 ^u. 

 Basal part of the receptacle 45 X 30 //; X 12 /i at base; its longest 

 divisions 250-675 /z. 



On the superior surface of a species of Euzercon parasitic on passa- 

 line beetles; No. 2794, Diquini, Hayti, M. C. Z. (Mann). 



A species most nearly related to R. Cornuti, and also to R. arach- 

 noidcs among other species parasitic on mites. From the latter it is 

 at once distinguished by the straight hyaline projection from the apex 

 of its perithecium. 



Rickia Cornuti nov. sp. 



Hyaline. Receptacle branching, the axes biseriate: consisting of a 

 short basal primary axis comprising a small basal cell, the pointed end 

 of which is usually intruded between the lower of usually two succes- 

 sive pairs of cells, all the members of which may cut off one or more, 

 often two, appendiculate cells; the slender two-celled, straight, nar- 

 rowly conical, free divergent base of the primary appendage arising 

 from, or just above, one of the upper members. Above, the receptacle 

 is divided into two somewhat divergent branches: one of them simple 

 or giving rise from the inner side near the base to one, rarely two, short 

 perithecial branches; always greatly elongated, with indeterminate 

 apical growth, the very numerous cells biseriate and for the most part 

 cutting off appendiculate cells bearing appendages of the usual type: 

 the other division similar, or more often shorter, and terminated by a 

 perithecium. Perithecia rarely nearly sessile, more often borne on a 

 variably developed axis of biseriate cells irregularly paired, from two 



