THAXTER. — LABOULBENIALES PARASITIC ON CHRYSOMELIDAE. 35 



either side which may be multiplied by successive branching so as 

 to form a rather dense tuft, none of the branchlets extending beyond 

 the tip of the perithecium. Perithecium free, erect, straight, deep 

 slightly olivaceous brown above its contrasting basal cells, the tip 

 bent slightly outward ; lip-cells hyaline, tipped by two minute papillae. 

 Spores about 40 X 3.5 fx. Perithecia, suffused part, average 75-85 X 

 32 fx. Appendages, longest, 85 fx. Receptacle, average, 135 X 25 fx, 

 (85-175 //)• Total length to tip of perithecium 140-250 fi. 



On Nisotra dilecta Dej. and Nisotra sp. Kamerun, German W. 

 Africa, (Schwab) usually on elytra: On N. Chapuisi Jac, Mada- 

 gascar, M. C. Z., No. 2504. 



The abnormal septation of cell II is more common than the normal 

 type on N. dilecta while on the second species, a uniformly steel blue 

 form, it is comparatively rare. Specimens in which the septation is 

 pronounced might well be mistaken for a species of Misgomyces. Speci- 

 mens also occur having the simplified structure of " Laboulbeniella" 

 as separated by Spegazzini. The material from Madagascar includes 

 only the normal type and the individuals are smaller and less well 

 developed. 



Laboulbenia Dysonichae (Speg.). 



Laboulbeniella Disonychae Speg., Contr. al Est. d. 1. Lab. Argent. 



p. 188. 1912. 



This species has been made the type of a new genus Laboulbeniella 

 by Spegazzini, which he based on the fact that cells II and IV are 

 replaced by a single cell. As I have already pointed out above, this 

 character seems to me too trivial to form the basis of a new genus, for 

 the reasons mentioned. It appears, however, to be the normal condi- 

 tion in many of the chrysomelid forms and is found in all the following 

 species, as well as occasionally in several of those above described, as 

 for example in L. Halticae. L. Tucumanensis described by Spegaz- 

 zini on a similar host, which is said, to possess stouter perithecia, does 

 not appear to differ in any essential respect from the present form, 

 as far as can be determined from the figures and description of the 

 author. 



Material of this species has been examined from Mexico, Biologia 

 Coll., No. 1768 on Disonycha figurata Jac, and was obtained by my- 

 self in Trinidad on D. austriaca Schf., Nos. 2474, 2474b and 2474B, 

 from the vicinity of Port of Spain and from Sangre Grande. It is 



