30 MUSEO NACIONAL DE BUENOS AERES. 



seen in side view. This gronp includes at least unimaculata De 

 Geer, ocJiracea Burra., ^wZ/a Burm., and, if Mr. Kirby's interpreta- 

 tion of Erichsou be correct, Erichsoni Kirby. Unimaculata is very 

 cióse to jjulla (see my description of Burraeister's type: Trans. 

 Am. Ent. Soc. xxv, p. 75, 1898), but is larger, and differs from tlie 

 type at least in tlie coloration of tlie sides of tlie thorax; on tlie 

 other band tbe male genitalia are precisely as in pulla. 



3[r. Kirby (Ann. Mag. N. H. (6) xiv, p. 263, 1894) has apparent- 

 ly separa ted unimaculata Burm. (which Burmeister states has 

 «gleicb anfangs drei Zellenreiben» in the posttriangular field of 

 the front wings), from unimactilafa De Geer, Eamb., because E-am- 

 bur places it in liis eleventh group having «deux rangées d'aréoles 

 discoidales». In m^- remarks on Burmeister's Domitia type (1. c. 

 p. 76), I bave shown bow little weight is to be attaclied to this 

 very división of Burmeister's, and it may be pointed out here that 

 Eambur places in his same eleventh group trivialis, a sj)ecies which 

 frequently (always?) has í/íree posttriangular cells, followed by two 

 rows, on the front wings. 



Unimaculata was originally described from Sminam: Hagen 

 (1875) added Pernambuco, and the Museum of Comparative Zoo- 

 logy at Cambridge, Mass., contains siDecimens from Para, by the 

 Tha^'er Expedition. The present locality is therefore more sou- 

 thern than any previously recorded. 



7. Tritheniis fusca Rambur. 



One male, compared with specimens in the Hagen collection 

 bearing this sj^ecific label in the handwriting of Barón de Selys, 

 who j)ossesses Rambur's type. Previously recorded from Cayenne 

 to Minas Geraes and Xew Friburg in Brazil. and from Paraguay 

 by M. Martin. 



8. Trilheniís Ijasí fusca Cal vert. 



Proc. Cahf. Ac. Sci. (2) iv, p. 530, 1895: (3) i, p. 396, 1899. 



Two males. Two females with the posttriangular cell formulas, 



front wings, 3. 3. 2. 2. 2. 3 , and 3. 2. 2. 2. 3 , apparently 



belong to this species, f or I find similar conditions existing in some 

 of my types, male and female, of basifusca although three post- 



