THAXTER. — MONOGRAPH OF THE LABOULBEM \< K. 2 : I 
on one side only, and consisting of from five to twelve cells. Peritheeia one to five in mm. I, r, the »|>- 
pendages from three to six, alternating with them, or succeeding one another somewhat invgularh 
the two series, peritheeia and appendages, somewhat divergent; the subtending cells relatively large 
and obliquely placed with reference to the bordering extension of the basal evil, so that the) Spjxar 
larger from one side than from the other. Perithecium rather long and slender, nearly straight, ttotlter 
and somewhat inflated in small individuals; the tip blunt or nearly truncate, tinged with smoky brown 
borne on a short inconspicuous stalk-cell from which it bends abruptly upward. Apj«ndages rela- 
tively large, consisting of two superposed cells, constricted at the septa; the basal one longer, distally rnor. 
deeply suffused; the upper distally suffused, and modified like the corresponding portion of the primal} 
appendage. Spores about 20 X 3 /i. Peritheeia, in well developed individuals, 100 X is /t . Primary 
receptacle about 60 //. Secondary receptacle (larger) 75 ft. Append; ;e.s about 58 X 13 ,". 
On Myrmedonia flavicornis Fauw, Hrit. Mus. (Biologia C.) No. Toil. Guatemala. 
This singular looking plant was found on various parts of the host, especially on the abdomen, ami 
shows considerable variation in the development of the secondary receptacle especially, small forms 
occurring with a single perithecium only. The accompanying figures reprex ut the most highly devel- 
oped individuals, and .show the tendency to degeneration which affects the tips of both primary and 
seconds ry appendages. 
Dimorphomyces Tiileopoims Thaxter. Plate XXVIII, figs. 12-13. 
Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 410. Apr., }<MH). 
Male individual much as in D* muticus, the primary appendage ending in a short blackened cell, 
bluntly rounded or nearly truncate. Total length to tip of antheridiuin fir, ^ to ti|> of sterile eell 37 ;i. 
Female individual. Structure of the receptacle tike that of the other j>eei« , \m\ only developed 
on one side of the median sterile portion, or primary appendage, which consists of three cells like (hat 
of the male individual and is black tipped. The appendages and peritheeia arising as in tin* other ipe- 
cies, the latter nearly symmetrically subfusiform, bluntly rounded at the tip, tinged with smoky brown, 
the tip undifferentiated, the appendages relatively large and simple. Peritheeia (not quite mature) 
50 X 14 p. Foot, to end of lateral portion, 50 /£. Total length to tip of perithecium 80 ". 
On Thleopora eorticalw Gz., Paris Museum, No. 297, Santa Anna, Madeir On inferior surface 
of abdomen. 
The material 
of the male 
terial of this species is very scanty and it is impossible to determine the exact appearand 
individual, since a single specimen, only, is present in the preparations plaecd . is shown 
in fig. 12 at the right. The species is closely allied to the preceding, but differs in the form of the peri- 
thecium, as well as in that of the primary and secondary appendages, the di i ionization at the tips of 
the latter causing them to appear truncate. 
DIMEROMYCES Thaxter. 
Eight additional forms of this very peculiar dioecious genus show that, although if (9 extremely well 
defined in general, the species present remarkable variations in structure, and, with the exception of 
Labovfbrnia, inhabit more diverse hosts than the members of any other genus. With th- iception of 
Herpomycea, no other genus has been found on Orthoptera, and three East Indian forms occur on small 
species of Diptera. Two of these dipterophilous forms, D. coarctatus and D. rh *phofV9, which are ver 
closely allied, are of especial interest; since, although both occur on the integument of the inferior surface 
of the abdomen of their soft bodied hosts, and thus live under practically identical contftfwia, theon 
absorbs its nutriment by a well developed haustorium which penetrates the body-cavity, Plate X\\ III, 
fi>. 7. whilo tliP nth»* fin. i I« nHnohod bv the usual foot and mows no sign of any penetration It 
«- 
hers of this genus will prove characteristic par. it« on For/8 
jK'cies of H> 
