OP ARTS AND SCIENCES. 187 



cium each consisting of about eight cells. Antheridial appendage 

 very large, consisting of twenty cells (more or less) bearing branches 

 at irregular intervals from its inner surface. Spores 85-90 x 4 p.. 

 Perithecia 130-150 x 45-60 /*. Receptacle 90-110 X 45-55 p. 

 Antheridial appendage 300-425 y.. Perithecial appendage about 

 325 n. 



On inferior surface of thorax of Berosus striatus Say, Maine. 



Ceratomyces minisculus nov. sp. 



Becoming more or less deeply tinged with reddish brown. Recep- 

 tacle consisting of about three superposed basal cells, all blackened 

 opaque and indistinguishable, surmounted by a few small cells partly 

 blackened below, from which arise the appendage and perithecium. 

 Perithecium subcorneal, ten or eleven cells in each cell row, a short 

 blunt conical unicellular projection borne sublaterally below the tip 

 which is usually curved slightly outwards. Appendage tapering to a 

 slender tip, simple, or bearing a few short branches near it- apex, 

 seldom as long as the perithecium. Spores 75 X 4 fi. Perithecia 

 110-150 X 30-40 /m. Receptacle, average, 90 X 40 p. Appendage 

 50-110 n long. 



On the edge of the elytra of Tropisternus nimbatus Say, Maine, 

 Connecticut, Texas. 



Ceratomyces filiformis, nov. sp. 



Suffused with reddish brown. Receptacle consisting of three super- 

 posed cells, the basal one partly blackened, surmounted by two cells 

 which form the origin of the perithecium and antheridial appendage. 

 Perithecium very long and slender, nearly cylindrical, tapering 

 abruptly and symmetrically to the subtruncate apex, the cell rows 

 composed of very numerous cells (maximum forty five). Appeni 

 short, tapering, straight, bearing terminally or subterminallv one or 

 two slender branches. Spores 55-00 X 3 M . Perithecia -'"•<> 330 

 X 33-40 fi. Receptacle 35 X 85 fi. Appendage 90 M . 



On the edge of the elytra of Tropisternus glaber (III).) and 71 



nimbatus Say. 



This species was at first taken for an abnormal form, but sufficient 

 material shows that it is a well marked Bpecies. It occurs near the 

 tip of the elytron, and is with difficulty distinguished from the bristle- 

 like hairs among which it occurs. It is remarkable for the srery -mall 

 number of spores present in the perithecium. 



