344 



MONOGKAPH OF THE LABOULBENIACE.22. 



ber of cells corresponding to the number of branches which it bears, the partitions running 

 obliquely downward and inward (fig. 27). In some specimens the basal cell of the receptacle is 

 curiously modified in a fashion (fig. 28) similar to that referred to in connection with Comp- 

 somyces verticillatus ; but this hoof-like structure does not appear to be either connected with 

 any special position occupied by the plant or with any peculiarity of the host, and is much less 

 frequent than the normal form. Many species of Philonthus appear to be subject to its attack, 

 whether they occur in moist or dry situations ; but the parasite rarely occurs in any great 

 abundance on a single insect. A form allied to this, but in such poor condition that it cannot 

 be described, was found on specimens of Bledius basalis Lee, collected in Florida. 



Laboulbenia curtipes Thaxter. Plate XVII, figs. 1G-19. 



Proc. Am. Acad. Arts and Sci. Vol. XXVII, p. 40. 



Becoming dark olive-brown except the contrasting hyaline basal cell. Perithecium relatively 

 large, stout, inflated ; its upper inner margin bulging strongly, the short, flat tip abruptly dis- 

 tinguished, bent slightly outward, the tips of the lip-cells hyaline. Appendages consisting of an 

 outer and inner basal cell not clearly distinguishable, the outer producing several, the inner 

 many branches sub-dichotomously branched, the ultimate branchlets slender, hyaline, somewhat 

 or hardly exceeding the tip of the perithecium. Receptacle short, sub-triangular, distally more 

 or less opaque, the basal cell hyaline. Spores, 40 x 4 yw. Perithecia, 110-135 X 55 fi. Append- 

 ages (longer), 100-125 yu,. Total length to tip of perithecium, 200-225 /x. 



On Bembidium bimaculatum Kirby, Washington. 



This species occurs usually on the posterior legs of its host, and is distinguished by the 

 peculiar form of its perithecium, in which are produced great numbers of spores. The append- 

 ages are almost invariably broken, and as no young specimens have been examined, their exact 

 origin at the base has not been made out. The outer basal cell bears a branch terminally and 

 probably laterally on its inner side, while a large number of branches usually arise from the 

 inner cell on either side. The basal cells, as well as the lower cells of the branches proceeding 

 from them, are usually so deeply suffused that the structure is obscured. The base of the 

 trichogyne is often persistent, as in figs. 16 and 18. 



This species was obtained in considerable numbers from specimens of its host sent me by 

 Miss A. M. Parker. 



Laboulbenia cornuta Thaxter. Plate XIII, figs. 28-30. 



Proc. Am. Acad. Arts and Sci. Vol. XXX, p. 476. 



Dark blackish brown. Perithecium tapering to a broad blunt apex, from which projects a 

 prominent straight, dark-brown appendage, unicellular, bent abruptly outward from its base, 

 tapering slightly to its nearly hyaline rounded tip. Appendages as in L. luxurians, the branches 

 fewer and stouter. Receptacle short, expanding somewhat abruptly, above the sub-basal cell, the 

 basal cell becoming narrowed and nearly hyaline towards its base. Perithecium, 85 x 29 p. Its 

 appendage, 26 x 7 p. Total length to tip of perithecial appendage, 185 greatest width, 52 /ot. 



On Bembidium complanulvm Mann, Washington. ^ 



