300 



MONOGRAPH OF THE LABOULBENIACEiE. 



On Musca domestical L., Europe. 



I am indebted to Miss Helen Bondy, of Vienna, for material of this interesting form, which 

 I found sufficiently abundant on house flies, of which she was kind enough to send me a large 

 collection. The parasites were attached to all parts of the host, but as a rule were more com- 

 monly found on the back of the head and thorax and near the base of the anterior pair of legs 

 and the adjacent portions of the body. Although there seems to be a tendency in the case of 

 female flies to bear the parasite on the upper, and of males to bear it on the lower side, as a 

 result of transference during coitus, I have found this condition by no means invariable as stated 

 by Peyritsch. The original account given by Karsten appears to be distinctly more correct 

 than that of Peyritsch; since he not only saw and figured the trichogyne with antherozoids 

 attached, but noted the twisting of the wall-cells of the perithecium, which seems to have been 

 overlooked by the latter observer. 



The figure of a mature specimen (Plate VIII, fig. 9) was reproduced from Peyritsch before 

 the material mentioned was obtained ; but is sufficiently good for purposes of identification. I 

 have searched for the species in several localities in this country without success ; but even if it 

 is not indigenous, it is very improbable that it does not occur here in view of the habits of its 

 host, large numbers of which are fcfcing constantly imported from Europe on vessels. 



I have not seen the original paper of Enoch in which the species was first described; yet 

 if the title given by Peyritsch is correct, " Laboulbenia Baeri Enoch, einer neuer Pilz auf 

 Fliegen," one cannot agree with the conclusions of Earsten (Hedwigia 1. c.) by which the name 

 Stigmatomyces Muscce Earsten is retained. 



Stjgmatomyces entomophilus Thaxter. Plate VIII, figs. 5-8. 



Proc. Am. Acad. Arts and Sci. Vol. XXIV, p. 8 ; Append icularia entomop/ii/a Peck, 38th Report (1885), p. 95, Plate III, figs. 



1-4 ; Berlese and Voglino in Saccardo, Sylloge Fungorum, Additamenta ad Vols. I-IV, p. 354 ; Appendkulina ento- 

 mophila Berlese, Malpighia, Vol. Ill, p. 59, Plate II, figs. 1-5 ; Saccardo Sylloge, Vol. VIII, p. 914. See also Gerke : 

 Wiener Entomol. Zelfnng, V, p. 168 ; Taf. II, fig. 14 (1886). 



Perithecium consisting of an ovoid, pale amber-brown base, abruptly narrowed above to form 

 the greatly elongated sub-cylindrical, beak-like, nearly hyaline distal portion. Receptacle tinged 

 with yellowish, long and slender, consisting of a basal and greatly elongated sub-basal cell, fol- 

 lowed by two cells, a posterior longer and narrower, which bears the appendage, and an anterior 

 (stalk-cell), separated from the perithecium by four small cells. Appendage small, consisting of 

 a more or less rounded basal cell, bearing the usual series of cells, the venters of the succes- 

 sive antheridial cells more or less completely united, the necks papillate, not very prominent. 

 Spores, 40 x 3.7 fi. Perithecium, 275—300 /x long, its base about 90 x 60 fi, its terminal beak about 

 195 x 18 fi. Receptacle, 300-325 x 30 fi. Appendage about 55 /jl long. 



On Drosophila nigricornis Loew., Nyack, New York (J. L. Zabriskie). On D. funebris F., 

 Europe (G. Gerke). 



I am greatly indebted to its discoverer for several preparations of this curious form, which 

 was originally collected by him on small flies found in a cellar during the month of March. 

 The species is chiefly remarkable for the great elongation of the sub-basal wall-cells of the peri- 

 thecium, which form almost the whole of its slender, beak-like, terminal portion. Professor 



