398 PROCEEDINGS OF THE AMERICAN ACADEMY. 



with the results hereafter indicated. These dipterous parasites alone are 

 included in the present paper ; but descriptions of the remaining novel- 

 ties will be published shortly. A set of duplicate preparations of all the 

 material found at Berlin has been made, and will be deposited there as 

 soon as the illustrations for the Supplement to my Monograph, which is 

 in preparation, are completed. 



A majority of the following forms belong, as will be observed, to 

 Stigmatomyces, a distinctly dipterophilous geuus, which must certainly 

 prove very large and widely distributed. That it is at the same time 

 very difficult from a systematic standpoint is evident from the material 

 studied, and few single characters, even of the appendages, seem to be 

 wholly reliable. In describing the species the two superposed cells 

 above the foot are regarded as constituting the receptacle, the upper 

 bearing the stalk-cell of the perithecium terminally, and that of the ap- 

 pendage laterally, in mature individuals ; the appendage proper consist- 

 ing of a more or less distinctly differentiated basal cell, which may or 

 may not bear antheridia like the series of fertile cells superposed above 

 it ; the antheridia, though often single, are more often asymmetrically 

 paired. The American species were obtained from small flies in part 

 collected for me by Mr. W. T. Clarke at Berkeley, California, and in 

 part by myself at Kittery Point, Maine, or in the vicinity of Cam- 

 bridge during September, for the determination of which I am indebted 

 to the kindness of Mr. D. W. Coquillett. The remainder, with the ex- 

 ception of the single African species on Diopsis, were all obtained from 

 the Ralum collections of Professor Dahl already referred to. 



Stigraatomyces rugosus nov. sp. 



Venter of the perithecium dark amber brown, roughened by about ten 

 transverse more or less irregular and sometimes anastomosing darker 

 ridges formed by irregular wart-like elevations ; evenly oval or elliptical, 

 and abruptly distinguished from the rather stout neck, which is usually 

 bent outward and about equal to it in length or somewhat shorter, dis- 

 tally distinctly enlarged, especially posteriorly; the tip beyond this en- 

 largement abruptly somewhat narrower ; the apex asymmetrical, the 

 three posterior lip-cells forming three corresponding projections, rounded 

 or bluntly pointed and more prominent than the bilobed papilla formed 

 below them by the anterior lip-cells. Stalk-cell of the appendage small, 

 subtriangular, amber brown, abruptly prominent below the relatively 

 large dark brown basal cell, which, though narrower, nearly equals it 

 in size, may or may not bear antheridia, and has a well-marked annular 



