THAXTER. — LABOULBENIALES PARASITIC ON CHRYSOMELIDAE. 27 



Laboulbenia Braziliensis nov. sp. 



Receptacle often straight and narrowly wedge-shaped, sometimes 

 slightly curved and less regular, but tapering more or less regularly 

 from summit to base; hyaline, becoming yellowish or tinged with 

 brown, deeply along the posterior margin especially immediately 

 below the insertion-cell; cell III longer than cell IV which is abruptly 

 prominent below the insertion-cell, sometimes forming a rounded 

 projection beyond it: cell V relatively large, sometimes as large as 

 cell IV, and in contact with cell III: cell VI relatively very large, 

 exceeding cell III in length. Insertion-cell thick and rather narrow; 

 basal cell of the outer appendage rather small somewhat rounded, 

 tinged with brown externally, separated by an oblique blackened 

 septum from a distal and external furcate branch, within which one 

 or more additional erect branches arise, not thus separated; basal 

 cell of the inner appendage much smaller, also pale brownish, giving 

 rise to branches on either side which are usually once branched, and, 

 like those of the outer, are rather stout hyaline or faintly brownish, 

 erect, slightly tapering, seldom reaching beyond the tip of the peri- 

 thecium. Perithecium deep rich brown becoming opaque or nearly 

 so, wholly free; the base of the venter somewhat narrower than the 

 basal cell-region below it, the outer margin nearly straight, the inner 

 convex; the tip bent outward, not distinguished except on the inner 

 side, the apex symmetrically rounded or almost truncate; the lip- 

 edges broadly hyaline, contrasting. Perithecia 130-158 X 40-48 /x. 

 Receptacle, average, 175 X 52 /x. Appendages, longest, 160 /x. 

 Total length to tip of perithecium 350-380 /x. 



On a chrysomelid allied to Wedionychus. Rio de Janeiro, Brazil, 

 M. C. Z. 'Mrs. Munro,' No. 1786, on the legs and elytra. 



This species seems to be very well distinguished from any of the 

 other species on Chrysomelidae. The host is a stout chrysomelid, 

 the elytra dark bluish black, with a red margin all around. More 

 than twenty mature individuals and numerous younger specimens 

 have been examined, in which the measurements seem unusually 

 constant and the variations in other respects slight, except that in 

 some specimens cell IV protrudes in a fashion which recalls less well 

 developed individuals of L. Bruchii. 



