252 THAXTER. — MONOGRAPH OF THE LABOULBENIACE^E. 
formed by the prolongation of the anterior lip-cells, the posterior lips forming a usually angular, some- 
times sharply pointed projection between them. Antheridia purplish, nearly straight or slightly curved, 
rather abruptly enlarged below the sharply pointed apex, the venter somewhat inflated. Perithecia 
80-100 X 25 pu Antheridia 35 X 7 pu Total length to tip of perithecia 200-225 X 100-115 /*. 
Appendages 35 //. 
( )n Philonthus flavolifnbahu Erichs., Panama, British Museum, No. 750 (Biologia Coll.); Las Ve- 
gsis, Mexico, Sharp Coll. No. 1130; P. parvimanus Sharp, Chontales, Nicaragua, British Museum, 
No. 710 (Biologia Coll.); Ph Hon thus sp., M 
(Smith Coll.); P. sn/balarins Nord., British 
No. 1 126; P. longicornis Steph., British Museum, No. 408, Island of St. Helena, also M 
Mus 
Museum. No. 400. M 
Coll., No. 1127; P. cruentatus Gmel., British Museum, No. 358, Europe; P. variant Peck, British Mu- 
seum, No. 359, Ealing, England; Philonthus sp. near oarians, Australia, Sharp Coll. 1128; Europe, Berlin 
Mus., No. 821; P. dimidiatus Er., British Museum, No. 761, Notting Hill, England. On abdomen. A 
form, apparently this species, also from Hong Kong, on Philonthus sp., British Museum, No. 396, on 
Philortihut sp. near P. scybaJarhis Nord., Sydney, Australia, Sharp Collection, No. 1125 (very typical); 
P. agilis Gra v., Austria, Berlin Museum, No. 822; Philonthus sp., Arabia, Sharp Coll., 1120; P. ehcneus, 
Grav., Siberia, Sharp Coll., No. 1121; also Berlin Museum, No. 820, Europe; Philonthus sp., Chile, 
Berlin Museum, No. 817; P. bipmtulatus Panz., Europe, Berlin Museum, No. 819. 
This common and widely distributed form, although it is in its typical form (Plate XXXI, fig. 5) 
one of the best distinguished and most easily recognized species in the genus, varies very greatly in the 
suffusion and development of its receptacle," which sometimes wholly lacks the black, fork-like upgrowths 
so characteristic in the figure referred to. It is very often associated, also, with what appears almost 
certainly to be a variety (fig. 9), that lacks the perithecial auricles and differs in its larger longer peri- 
thecia, and usually in its larger, sometimes almost colorless, receptacle: such forms, though usually 
shorter and stouter than the typical D. princeps, resembling this species very closely. A similar auricled 
form has not, however, been found to accompany the typical D. princrps, and specimens of typical D. 
vuhjatus, from Europe, Australia (fig. 5) and North and South America, correspond in even the most 
minute details. Its hosts are usually larger Philonthi on which it may occur in large quantities. The 
species is closely allied to D. dubius. 
Dichomyces dubius Thaxter. Plate XXXII, figs. 7-10. 
Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 426. April, 1900. 
Receptacle much as in D. princeps and similarly colored, smaller, shorter, and stouter, antheridia 
large purplish; the distal tier of cells producing typically two, rarelv more, perithecia, which are dull 
brownish and dimorphous; usually rather slender, tapering slightly, the posterior lip-cells producing 
- °;\ th5 ; recurwd or bent forward as in D. vulgatus: more rarely larger and stouter, the blunt, 
of en asvnunetncal tip without appendages; the two forms sometimes, but not usually, associated on 
neri 1^,!!! l< U \ CXtem a PP enda « es normall y large, long, colorless, reaching to the middle of the 
en It" ; J' 1 ' IndividUa,S as >— trical, with a single antheridh.m and perithecia of 
length to J of ;4he,nm avera^ ^0 *"" " X * * ""*■* *" ™ * ^ * ^ 
This^^s'T'T T S " f^^ FaHS ' NCW Y ° rk = F - h P <** Cambridge, Mass. 
thus ^^o^^t^t^T^Tr from Nia * ara PaUs ■* *■ **»* - d l l,ave 
dani material Ins «£ ♦. u ° ne ° f the Iar * est s P edcs of Philonthus in this region. Abun- 
-, ,,;":;! l M ffis^ 1-7 i resh Pond ' near Cambri ^ *«* *-* -* 
semble forms of D vrtZZ .^ " wh,ch the Pithed, are not auricled and which closely re- 
^^•/>-^P and some of the forms of D • ^/ 7 a/,, which are without auricles. It is per- 
