THAXTEIt. 



— MONOGRAPH OF THE LABOULBENIACE. E . 



257 



auricles, and the conformation of the tip of the perithecium. A few specimens lack entirely the usual 

 blackish-brown sufl'usions, and except tor the auricles very closely resemble typical individuals of l>. 

 princeps. It was found abundantly on a single specimen in a large series of its host in Dr. Sharp's 

 ( lolled ion. 



DlCHOMYCES PERUVIANAS Thaxter. Plate XXX, figs. 3-5. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 426 April, 1900. 



Receptacle with faint brownish shades especially along the septa, almost in the form of two super- 

 posed isosceles triangles, the lower very regular, including the basal cell and the first and second tiers, 

 its distal margin horizontal, the upper truncate at the base and distally concave. The basal cell short, 

 the lower tier consisting of from three to four cells, nearly equal in length; the middle tier of typically 

 thirteen cells, the antheridia of medium size, the outer five cells distally appendiculate, one of the append- 

 ages situated behind the antheridium as usual; the distal series consisting of usually twenty-seven cells 

 bearing typically four perithecia, the appendages placed as usual, colorless, somewhat shorter than the 

 perithecia, which are mostly brownish externally and hyaline on the inner side, the brown or reddish 

 fawn-color sometimes predominating, asymmetrical, somewhat inflated, slightly bent inward near the 

 tip which is small, pointed, and well distinguished. Perithecia about 120 X 30 /i. Receptacle 207- 

 240 X 140-175 pi. Appendages 185 ;i (longest). Total length to tip of perithecium 300-350 /i. 



On Braehyderus simplex Sharp, Sharp Collection, No. 774. Peru. On Plodopterus /actus Sharp, 

 Garrao, Amazon, Sharp Collection, No. 1156. 



The types of this species from Peru (fig. 4) are somewhat more slender and darker than the Amazon 

 material (fig. 3). The species differs from all others by the pointed tip of its perithecium, which results 

 from a prolongation of the posterior lip-cell, i. e. on the side opposite that which corresponds to the in- 

 sertion of the antheridia. The suffusion of the anterior and posterior wall-cells is also a well marked 

 character not seen elsewhere, the limitation of perithecia! suffusions in other species being transverse, as a 

 rule. It is most nearly allied to D. princeps, stout forms of which often resemble it closely except for 

 the perithecial suffusions and pointed tip. 



DlCHOMYCES princeps Thaxter. 

 The occurrence of forms resembling this species, or identical with it in appearance, has been noted 

 under D. vulgatus and D. dubius. Specimens of the typical form occurring unassociated with any other 

 have been found as follows. British Museum No. 371, Philonthus sp., Blois, France; No. 380, Phil- 

 onthus sp., S. W. Australia; No. 40G, Philonthus Scybalarius, Madeira; No. 424, Philonthus rephaloies 

 Grav., Europe; No. 372 on Philonthus sp., North India; No. 743, (Biologia Coll.), Mexico, on Quedio- 

 marcus puniceipennis Solsk. : Paris Museum; No. 208, on P. longicornis Steph. Madeira; No. 4G, on 

 ? Philonthus sp. Mexico; Berlin Museum No. 815, P. sordidus, Europe; No. 816, on Philonthus sp., St. 

 Vincent: Sharp Collection, No. 1118, on P. sordidus, California. 



Dichomyces infectus Thaxter. Plate XXXI, figs. 3—1. 

 This species, which was described from a unique type, has been found again at Fresh Pond, Cam- 

 bridge, on Xantholinus ohsidianus sometimes associated with D. furcatus, or a form hardly distinguishable 

 from this species. It usually assumes the form represented in fig. 4, but sometimes develops short "forks" 

 as in fig. 3. The perithecia are always normally paired and usually diverge decidedly. 



Dichomyces Angolensis Thaxter. Plate XXX, figs. 6-7. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 421. April, 1900. 

 Basal cell hyaline. Lower tier opaque or the middle cell subhyaline, the marginal cells opaque, 

 extending up on either side of the middle tier: middle tier relatively large, consisting of about thirteen 

 to sixteen hyaline cells, the three to four external ones continuing the margin of the first tier directly and 

 either subhyaline or blackened below, each bearing a normal appendage; the antheridia of medium 



