194 PROCEEDINGS OF THE AMERICAN ACADEMY. 



cell of the inner appendage bearing one or two short branches, the 

 lower cells of which bear a few antheridia. The perithecium is 

 straight, very slightly inflated, the tip clearly distinguished, deeply 

 blackened, the lips hyaline, turned slightly outward, separated by a 

 slight apiculus. 



Laboulbenia hemipteralis nov. sp. 



Receptacle rather short and stout, the basal and subbasal cells 

 subequal in length; the former hyaline; the rest of the receptacle 

 more or less deeply tinged with olivaceous,- especially the relatively 

 broad distal portion; cell VI (stalk-cell) small, triangular, its oblique 

 contact with cell II not extending to the end of the latter; the basal 

 cells of the perithecium obsolete; the ascigerous cavity lying immedi- 

 ately above the stalk-cell. Perithecium olivaceous, tapering, its 

 distal half, only, free; the tip conspicuously blackened and bent 

 slightly inward; the apex subsymmetrically rounded, or slightly 

 pointed, concolorous with the tip; the pore turned inward. Insertion- 

 cell relatively very broad, lying somewhat higher than the middle of 

 the perithecium, the basal cell of the outer appendage bearing a single 

 branch, consisting of a single cell externally suffused at its base, bent 

 inward slightly, producing four or five closely successive branchlets 

 externally, the lowest of which is distinguished by a thin darkened 

 septum and bears about four secondary simple branchlets in a simi- 

 lar fashion, the lowest of which is more slender and suffused especially 

 at its base, usually projecting subhorizontally, the others hyaline; 

 the remaining primary branchlets hyaline, simple or furcate, often 

 spirally curved above: the basal cell of the inner appendage giving 

 rise normally to an outer and an inner and two lateral branches, 

 consisting of single short cells, each bearing a large terminal brown 

 antheridium, which may be replaced by a sterile branch bearing hya- 

 line branchlets like those above the base of the outer appendage. Peri- 

 thecia 66X20-23 /x- Spores 22X2.6 yu (in perithecia). Receptacle 

 85X23 /x. Appendages to tips of longest branchlets, 105 m- Total 

 length to tip of perithecium 100-120 /x. 



On the legs and inferior surface of Velia Platensis Berg., Palermo, 

 near Belgrano, 'No. 1951 along the margin of a pool. (Van Duzee 

 det.) 



This very clearly distinguished form which was found with the fol- 

 lowing species, is the first of the genus thus far reported on Hemiptera. 

 The material is abundant and in good condition. 



