42 PROCEEDINGS OF THE ACADEMY OF [Feb., 



quented one, the description is such that it could be identified with 

 Httle difficulty. 



The name Pseudostauronotus was proposed by Giglio-Tos under the 

 impression that the type, hrunneri, was a member of the very insuffi- 

 ciently described genus to which Brunner applied the same name two 

 years previously .^^ As Brunner's name rests on a description of seven 

 words without included species or tjrpe mentioned, it is really a nomen 

 nudum and as such not invalidating the later use of the name by Giglio- 

 Tos, even when used in misapprehension. Scudder has shown ^^ from 

 the evidence of material sent him by Brunner that Pseudostauronotus 

 of that author equals his much older Stirapleura. 



Some species of the genus appear to resemble species of Boopedon, 

 others forms of Stirapleura and several have a striking superficial 

 resemblance to forms of the Locustine genus Schistocerca. The fol- 

 lowing arrangement appears to present their relationship as clearly as 

 possible in a linear arrangement. 



Species but little variegated, the coloration rather uniform; lateral 

 carinas of the pronotum moderately arcuate, not prominent; super- 

 ficially resembling Boopedon. 

 Scyllina uniformis Rehn. 

 Scyllina instabilis n. sp. 



Types: 6^ and 9 ; Sao Paulo, Sao Paulo, Brazil. September 5, 

 1900. (Adolph Hempel; No. 202.) A. N. S. Phila. 



This species is closely allied to S. uniformis, but differs in the sharper 

 caudal angle of the pronotum, the longer metazona of the pronotum 

 (much longer than the prozona), the slightly narrower interspace be- 

 tween the eyes and the rather different type of coloration. 



Size medium ; form robust. Head with the f astigium broad, rounded 

 rectangulate, depressed area crescentic, interspace between the eyes 

 equal to the interantennal width of the frontal costa, lateral foveolse 

 oblong, punctate, slightly impressed; viewed laterad the fastigium 

 rounds into the frontal costa without' angle; frontal costa broad, sub- 

 equal, slightly constricted above the antennae, two rows of punctures 

 dorsad; supplementary facial carinas indistinct ventrad; eyes acute 

 reniform, slightly longer than the infraocular portion of the 

 genae; antennae slender, slightly depressed proximad. Pronotum 

 with the cephalic margin arcuato-truncate, caudal margin obtuse- 

 angulate, sharper in the male than in the female; median carina 

 rather high, distinct, cut slightly cephalad of the middle by the 



" A?w. Mus. Civ. Stor. Nat. Genova, XXXIII, p. 123, 1893. 

 « Canad. Entom., XXIX, p. 76, 1897. 



