TIIAXTER. — MONOGRAPH OF THE LABOULBENIACB^EJ. 



terminal blackish shade on the inner side. Appendages divergent and free through the enlargement of 

 cell V: the outer appendage simple, short, four- to five-celled; the basal cell of the inner appendage some- 

 what smaller than that of the outer, bearing a branch on either side similar to the outer appendage, the 

 three straight closely applied in a more or less compact group. Receptacle rather coarsely punctate, the 

 basal cell slender below and suffused above the foot, rather short, and separated from the usually very 

 long subbasal cell by a more or less distinct constriction; cells III, IV and VI subequal, more than half 

 the upper margin of cell V free. Perithecia 100-125 X 35-40 ft. Receptacle 220-275 X 45 ft. Ap- 

 pendages about 90 ft. Total length to tip of perithecium 290-360 ft. 



On elytra and abdomen of Bledius jacobinus Lee, California; Sharp Collection, No. 1 174, on Bledius 

 basalts Lee., Florida (Henshaw Collection). 



Figure 8 and 10 of the accompanying plate represent the Californian specimens of this species, and 

 fig. 9 one of the smaller stouter forms occurring on Bledius in Florida. None of the material is in very 

 good condition and I have even been led to suspect that the species might prove a depauperate condition 

 of L. Philonthi which, however, in its typical condition would appear to be abundantly distinct. 



Laboulbenia Formicarum Thaxter. Plate LVIII, figs. 14-15. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVIII, p. 39. June, 1902. 



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-dis- 

 tinguished 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. Appendages normal, insertion-cell blackened, but not 

 deeply, the outer appendage simple, the three lower cells inflated, the subbasal cylindrical and distinguished 

 by dark septa. Spores 30 X 2.5 ft. Perithecia 50-60 X 16-18 ft. Receptacle 30-35 X 18 ft. Longest 

 appendages 90 ft. Total length to tip of perithecium 70-80 ft. 



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



This very minute and peculiar species appears to be common on small ants in the Cambridge region. 

 It is perhaps as nearly related to L. inflata as to any other species, the appendages being very similar in 

 both cases. The conformation of the receptacle is, however, unlike any other species. Rickia Wass- 

 manni is thus far the only other member of the family that is known to occur on true ants. 



Laboulbenia microscopica Thaxter. Plate LVI, fig. 17. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 187. Dec, 1899. 



Perithecium one half or wholly free, pale olivaceous, somewhat inflated, tapering to the relatively 

 long narrow subtruncate blackened tip which is bent slightly inward. Lower half of receptacle greatly 

 reduced in size, the basal cell hyaline or nearly so, the rest suffused with dark brown, cell III paler, cell II 

 broader than long, cells III to V relatively large, bulging prominently outward beyond and below the 

 insertion-cell. Outer appendage consisting of a basal cell which becomes sub-triangular through the 

 protrusion of its upper outer angle which renders its distal margin twice as broad as the basal cell of the 

 single branch which rises from its upper inner half. The inner appendage arising from a much smaller 

 basal cell which produces two branches. Spores about 35 X 3 ft. Perithecia 75-93 X 27-34 ft. Total 

 length to tip of perithecium 120-140 ft; to insertion-cell 75-90 p.. Greatest width 45-60 ft. Appendages 

 about 70 ft. 



On elytra of Pelmatellus nitescens Bates, Brit. Mus. (Biologia Coll.), No. 683, Vera Paz, Guatemala. 

 One of the very smallest species, in which the perithecium is larger than the whole of the receptacle. 

 Apart from other peculiar characters, the shelf-like projection of the basal cell of the outer appendage 



