HO ENTOMOLOGICAL NEWS. [Mar., 'l/ 



in width as the stridulating field widens, while in the female 

 this difference in the form of the pronotum is apparently the 

 only feature which will readily separate the forms. Females 

 of couloniana and quadrata are very similar, so much so that 

 they are sometimes extremely hard to separate. We have giv- 

 en figures of the principal differences separating the species, 

 as they are so comparative that their use in a key would be 

 difficult and at most unsatisfactory. We find no other features 

 of sufficient importance to use as diagnostic features. 



Stilpnochlora marginalia (Serville). Plate X, fig. 1. 



1839. Phylloptera marginclla Serville, Hist. Nat. Ins., Orth., p. 405. 



["Cape of Good Hope.""] 

 1869. Phylloptcra magnifolia Walker, Catal. Derm. Salt. Brit. Mus., 



II, p. 377. (Part.) [Brazil; Guayaquil.] 



Trinidad. (F. W. Urich.) One male. [A. N. S. P.] 



Surinam. V, 1881. (C. G. Hering.) One female. [U. S. N. 

 M.] 



Cayenne. One male. [A. N. S. P.] 



Peixe Boi, east of Para, Para, Brazil. XI to XII, 1907. (H. 

 B. Merrill.) Two females. [A. N. S. P.] 



Igarape-assu, Para, Brazil. (H. S. Parish.) One male. 

 [A. N. S. P.] 



Bonito, Pernambuco, Brazil. XI, 1883. (A. Koebele.) One 

 male. [U. S. N. M.] 



Piracicaba, Sao Paulo, Brazil. One male, one female. [Heb- 

 ard Cln.l 



The species has been previously recorded from as far south 

 as Rio de Janeiro, Brazil. This form is smaller than the av- 

 erage of the other types of this group. It has the narrowest 

 pronotum and stridulating field of the male tegmina and the 

 general form is faintly more compressed than in the other spe- 

 cies. The specimens from Piracicaba have the lateral lobes 

 of the pronotum faintly narrower in proportion to their depth. 

 The male stridulating field is identical in its important features 

 with the north Brazilian males. We consider these specimens 

 to represent the extreme condition of marginella. 



