THAXTER. — NEW LABOULBENIACEAE. 39 



On Tachys incurvus Say, Cambridge. On Tachys sp., Cocoauut 

 Grove, Florida, December. 



Laboulbenia Formicarum nov. sp. 



Basal cells of the perithecium small, compact, not distinguished from 

 the body, which is suffused by darker brown shades and tapers from 

 near the broad base, with but slight inflation, to the well-distinguished 

 tip ; which is more or less distinctly curved outward, with subterminal 

 blackish suffusions on both sides; the rather blunt, coarse-lipped apex 

 outwardly oblique. Receptacle abnormal in form, very short and stout, 

 the basal cell small hyaline, narrow below, abruptly broader distally 

 below the subbasal cell, which is broader than it is long and bulges 

 prominently externally, giving the plant a humpbacked habit; cell III 

 small, broader than it is long ; cell IV small, squarish, separated from 

 cell V, which is slightly smaller, by a nearly vertical septum. Append- 

 ages normal, insertion-cell blackened, but not deeply, the outer append- 

 age simple, the three lower cells inflated, the subbasal cylindrical and 

 distinguished by dark septa. Spores 30 X 2.5 p. Ferithecia 50-60 X 

 16—18 ju. Receptacle 30-35 x 18^. Longest appendages 90 fi. Total 

 length to tip of perithecium 70-80 /*. 



On all parts of Lasius Americanus M. and of Formica neogagates M., 

 Cambridge, Mass. I am much indebted to Mr. Theo. Pergande for the 

 identification of these hosts. Rickia Wasmanni Cavara, a genus with 

 compound antheridia belonging among the Peyritschiellae, is the only 

 other form that has been found on true ants. 



Laboulbenia fusiformis nov. sp. 



Perithecium relatively long and slender, becoming nearly opaque and 

 marked by scattered blackish points more conspicuous near the base, 

 sometimes nearly obsolete, erect, or slightly divergent above the stalk, 

 straight, subfusiform ; the basal wall-cells forming a short hyaline stalk ; 

 the tip often rather abruptly differentiated, darker, often curved outward ; 

 the lips suffused, or the edges hyaline. Receptacle very long and 

 slender ; the basal cell short, nearly hyaline ; the rest pale dull browish, 

 indistinctly transversely striate-punctate ; cell II very long, isodiametric 

 throughout, except where its distal end is obliquely overlapped for a 

 short distance by cell VI, separated by a short horizontal septum from 

 cell III, which is much elongated and is separated from cell IV by an 

 oblique septum, above which the receptacle shows a slight but abrupt 

 contraction in diameter ; cell IV more than twice as long as cell V. 



