MOXOGRAni OF THE LABOULBENIACE.f!:. 351 
LABOrLBENIA VARIARILTS Tliaxtcr. Plale XXT, figs. 1-4. 
Proc. Am. Acad. Arts and Sci, Vol. XXVII, p. 38. 
Nearly hyaline or suiTusod, sometimes deej>1y, with srnoTvV brown. PfTlthorium siriiighf and 
rather narrow, or stout and inflated; hyah'nc or deep smoky-brown, IJnHcencd deci>ly beluw flie 
hyaline tips of the lip-cells, which arc rather coarse and turned slightly outward or nearly 
straight Appendages numerous, arising from as many small cells, which take the ])lacc of (he 
ordinary insertion-cell, several times sub-dichotomously branched, the lower three or four septa 
blackened and oblique, the cells between them inflated, the ultimate branchlets straight, taperi!tL^ 
rather slender, erect or slightly divergent Authcridia borne on short brnnchluts about the 
lowxr portion of the nppondages, furmhig a conical cluster and arising laterally as well as ter- 
minally in variable numbers, Receptar^le normal, except that cells IV and V uiay be diistall/ 
■ 
and irregularly divided into a few small cells; bhurt and stout or very elongate, hyaline or 
wholly or partly suffused with smoky brown, the darker ]>ortions jainctatc. rcrithccia, 100 X 
225-35 X 125 fi. Appendages, longest, 475-500 fi. Total length to ti]» of i*crithecium. 180 fi to 
1.65 ram. Spores, 50-75 x 6-7 fi. 
On Anomoghsni^ pusiUiis Say, Chhvnms ocstirus Say, C. cuvintlUn Jjcc, C\ cvrsor Ohev,, C. 
leucoscelis Chaud., C. fioridanus Horn, C. pennsifhanicnn Say, C, rujxcauila Chaud., C. >f^>ar>?/t 
Lee., 0. texanus Horn, C. tricolor Dcj., C. viridicoUh Reiche, Omoplivon americamnn Pej., Omo- 
pliron spp. indet., Nebria paUipes Say, Pterostichiis adoxus Say, P. lu^tuoHys T>ej., P. corvmns 
Dej., P. caudicalis Say, P. Sayi BruUe, Pairohus loyigicornis Say, PlafifnuB extemicoUh Say, 
Mauic to Florida and Texas, Utah, Nebraska, Washington, California, and Mexico. On Pterosti- 
chus (?) sp., Brazil. 
This species is remarkable for its great variation in size, even on the same host; specimens 
Pterosti 
o 
Omophron are less than 200 /x in length. The form and relative position of the pcrithecium 
also differs very considerably, and in one instance the tip of the pcrithecium scarcely exceeds 
cell Y, being united to the receptacle throughout its length. Although their number and length 
varies very greatly, the species is always readily recognized by the character of the appendages 
and their insertion on an irregularly cellular base, which is made up partly from divisions of an 
original single insertion-cell and irregular terminal divisions of cells IV and V. It is a commi>n 
form, occurring on all parts of its hosts, though preferring defmite positions in certain cases, as 
for example in PUrostichus luduosus^ where it is usually found along the edges of the elytra, 
especially the left near the base. It grows usually scattered, but often rather closely crowded. 
It is more closely connected with the aquatic forms than any other species, unless perhaps L. 
armillaris, through the irregularity of the cells which form the base of insertion of its api)rnd- 
ao-cs, and affords a connecting link which renders the exclusion from the genus of the fust 
mentioned forms quite unwarrantable unless they may prove to present essential variations in 
their sexual processes. 
The material from South America, which was obtained from specimens uf a Brazilian Pd n> 
tichus{l) in the Museum of Comparative Zoology, was found on the legs and on the lower sur- 
face of the thorax of the host, and although some of the specimens are peculiar in habit, 
