OP ARTS AND SCIENCES. 81 



Perithecia 55-60 X 11-12^. Length of receptacle 75 jx. Basal 

 cell 15 X 7.5/1. Total length 90-100 p. 



On LaccophUus maculosus, Hydroporus spurius, etc., Connecticut. 



A very common species, occurring in considerable numbers on 

 the elytra of the host, possessing the simple typical structure of 

 the genus, and distinguished by its evenly curved habit, blunt 

 perithecium, and uniform color. 



Heimatomtces htalinus, nov. sp. 



Hyaline or very faintly tinged with yellowish brown. Perithe- 

 cium large, at first hunched externally, and bent inward near the 

 apex, becoming nearly straight, tapering to the rather small apex, 

 which is bent somewhat abruptly outwards at maturity. Basal 

 and sub-basal cells of receptacle broad, nearly equal, or the basal 

 twice as long as the sub-basal, the two separated by a well defined 

 septum. Spores 8 X 2.5 /*. Perithecia 75-90 X 20 /x. Total 

 length to tip of perithecium 110-120 fx. 



On LaccophUus maculosus, Connecticut. 



Differing from the last in its larger size, and stouter straight 

 perithecium, as well as in minor points. It occurs only on the 

 posterior legs of its host. 



Heimatomtces affinis, nov. sp. 



Rather strongly suffused with yellowish brown. Perithecia 

 commonly slightly curved inwards, or nearly straight, the tips 

 often slightly bent outwards. Basal cell of receptacle large, sub- 

 triangular, suffused laterally and terminally with deep black- 

 brown : sub-basal cell very flat ; terminal cell small, its axis bent 

 strongly inwards. Spores 50-55 X 3 jx. Perithecia 100-110 X 

 30 fi. Basal and sub-basal cells of receptacle 40—15 fi. Total 

 length to tip of perithecium 150-170 fx. 



On LaccophUus maculosus and Hydroporus sp., Connecticut. 



Nearly allied to H. hyalinus, from which it may be separated 

 by its larger size and suffused basal cell. It occurs at the apex of 

 the right elytron. 



Heimatomtces appendiculatus, nov. sp. 



Becoming faintly brownish. Perithecium tapering to a rather 

 sharp apex, curved strongly outwards, hunched externally (often 

 distorted by twisting), and bearing a straight, sub-clavate, one- 

 celled, brownish appendage arising externally below the apex. 



