33 PROCEEDINGS OP THE AMERICAN ACADEMY 



multicellular base, which is more highly developed than in L. lux- 

 urians or L. fumosa. 



Laboulbenia luxurians, Petr. 



A form which appears to be identical with this species, and 

 closely allied to L. fumalls, occurs usually on the tips of the 

 elytra of species of Bembidium in Maine, and has also been sent 

 to me from Washington by Miss Parker. 



Laboulbenia variabilis, nov. sp. 



At first hyaline, becoming more or less tinged with brown. 

 Perithecia moderate, tapering only slightly to the rather blunt, 

 outwardly oblique, coarse-lipped apex, which is more or less deeply 

 blackened below, especially on the inner side. Pseudoparaphyses 

 very variable in number, sometimes hardly branched, sometimes 

 forming a dense fascicle : arising more or less indefinitely from a 

 small number of basal cells above cells IV. and V. of the recepta- 

 cle, from which they are not separated by any disk of insertion : 

 the basal portion short, constricted at the blackish septa, the seg- 

 ments slightly inflated; the distal portion slender, cylindrical, 

 aseptate or obscurely septate, hardly tapering; often hardly ex- 

 ceeding the perithecium, sometimes several times its length. 

 Antheridia overlapping one another on special lateral branches, 

 forming a subcorneal cluster. The plane of insertion of the 

 pseudoparaphyses usually opposite the middle of the perithecium, 

 sometimes carried beyond its apex by the elongation of cells III. 

 and IV. of the receptacle. Receptacle medium or much elongated; 

 cell V. often enlarged, and protruded along the inner face of the 

 perithecium, so as to throw the pseudoparaphyses and their inser- 

 tion outwards. Spores 50-60 x 6 ll. Perithecia 92-130 x 33-50 /*. 

 Pseudoparaphyses 150-480 p. Total length to tip of perithecium 

 180-550 fi. 



On Omophron Americanum, Chlcenius Pennsylv >anicus, Connecti- 

 cut. On Nebria pallipes, Chlcenius cestivus, Virginia (Pergande). 

 On Platynus extensicollis, Patrobus longicornis, Pterostichus cor- 

 vlnus, S. Dakota (Aldrich). 



A species remarkable for its great variation in size even on the 

 same host, as well as the irregularities connected with the number 

 and relative insertion of its pseudoparaphyses. The latter are 

 peculiar from their differentiation into a basal short portion, com- 

 posed of a small number of slightly inflated cells, and a distal 



