690 THAXTER. 



On Ochtheroidea sp., No. 2062b (Type), St. George, Grenada, W. I., 

 at base of right Aving. On Psilopa sp. on wing, No. 1387, Island of 

 Margarita, Venezuela (Blakeslee). 



The specimens from the two localities above mentioned are abso- 

 lutely identical, and seem well distinguished from other forms which 

 occur on related hosts. Its nearest alh^ appears to be the rather 

 variable S. Discoccrinac , which is distinguished by its normally shorter 

 more compact appendage, uniformly hyaline receptacle indented at 

 the septum and differently developed perithecium. 



Stigmatomyces dubius Thaxter. 



A form that seems to correspond so closelj' to this species that I 

 am unwilling to separate it specifically, has been found growing on 

 the legs of Ochthcra exsculpta Loew., No. 2807, St. George, Grenada, 

 B. W. I. It corresponds in general form with the New Guinea types 

 from Ralum, New Pommerania, which were obtained from a fly 

 allied to Ochthcra and possibly belonging to this genus. In the West 

 Indian form, the appendage consists normally of eight cells, of which 

 the seventh is spinose. The tip of the perithecium also, is more 

 abruptly distinguished from the neck, while the lips are hardly promi- 

 nent and lack entirely the tongue-like prolongations of the type. 



Stigmatomyces gracilis Thaxter. 



I refer to this species, also with some hesitation, a form which 

 occurs on the abdomen and at the base of the posterior legs of Ochthcra 

 mantis De G., from Fayetteville, Arkansas, Nos. 1802 and 1803. 

 The appendage is terminated by a spinose antheridium, and, although 

 it consists of usually six cells, instead of five as in the New Guinea 

 material, is otherwise identical. The general form of the individuals 

 from the abdomen is stouter, curved, or with the axis of the perithe- 

 cium directed inward at an angle to that of the receptacle, while the 

 tip is much less abruptly distinguished from the neck. The apex may 

 be exactly similar in both; or more or less well developed, slightly 

 divergent, ear-like projections may be present at maturity from the 

 outer lip-cells. These projections, however, may be quite undevel- 

 oped. The individuals growing at the base of the posterior legs,. 



