94 



BULLETIN 120, UNITED STATES NATIONAL MUSEUM, 



(Cope), three abundant infections, two from Tehuantepec, Mexico, 

 F: Sumichrast, collector, and the other labeled merely " Mexico," F. 

 Sumichrast, collector. The individuals of this third infection are 

 poorly preserved and have not been studied in detail. 



a d 



Fig. 61. — Zelleuiella [engystomopsis], from ENGYSTOxiors stentok, X 460 diameters. 



Measurements : A., of a large individual of the broader form; B, of 

 a full-sized individual of the more wedge-shaped form; C^ of an 

 individual in division — 



Many individuals of this species, even some of the broadest, are 

 pointed posteriorly (figs. 61a and 62). In some cases the point is 

 abrupt and small. The number of the massive chromosomes can not 

 confidently be stated from the preparations available for study. Fur- 

 ther study of a larger series of infections may show this form to be 

 very close to, or possibly identical with, Z. couchii. I am therefore 

 bracketing the specific name. 



