698 THAXTER. 



is in general characteristic in form, but, although it is usually quite 

 smooth, it may as in the case of S. purpureus, be modified by variably 

 ■developed tubercular outgrowths, four vertical double rows of which 

 may be developed on the venter, and which may also involve the neck. 

 Such types are more often found on the wings of the host, and have 

 been obtained on species of Oscinis from Mexico, Jamaica and Trini- 

 dad, W. I. The material examined includes twenty five numbers: 

 from various localities in Jamaica on species of Oscinis, Siphonella 

 and Hippelates; two numbers from Bocas del Toro Panama, on 

 SiphoneUa and Oscinis; one number on Siphonella from the Grand 

 Etang, Grenada, W. I.; five numbers on Oscinidae from Trinidad, 

 W. I., and eight numbers from Kamerun on Oscinidae, of which one, 

 only, the very beautiful and peculiar Anatrichus erinaceu^ has been 

 kindlv determined for me bv Professor Aldrich. 



On Drosophilidae. 



Stigmatomyces Sigaloessae nov. sp. 



Receptacle subclavate, slightly broader at the septum, the subbasal 

 cell sometimes much longer than the basal, stout and rather abruptly 

 broader and convex distally, the region immediately above it abruptly 

 somewhat narrower. Stalk-cell of the appendage short subtriangular, 

 distally somewhat inflated. Appendage relatively small, somewhat 

 curved, consisting of usually six or sometimes seven cells; the basal 

 larger, distally oblique, somewhat suffused with amber-brown; the 

 rest small, broader than long, each bearing a single antheridium; the 

 series terminated by two; all somewhat irregularly superposed in a 

 vertical series. Stalk-cell and secondary stalk-cell of the perithecium, 

 as well as the basal cells and the stalk-cell of the appendage, not differ- 

 ing greatly in size, and forming a rather short, compact region some- 

 what sufPused with amber-brown, narrower below. Venter of the 

 perithecium relatively large, with broad base, subelliptical, or tapering 

 more distinctly distally, more or less suffused with amber -brown; 

 the wall-cells distinguished by a conspicuous ridge, or wing, which is 

 strongly spiral, making a half turn with two strong curves: the neck 

 and tip very slightly or not at all. distinguished from one another, 

 abruptly distinguished from the venter, hardly tapering, hyaline; the 

 apex well distinguished, as long as the tip, the terminations of its cells 

 forming four rounded, well defined prominences symmetrically dis- 



