226 PROCEEDINGS OF THE ACADEMY OF [May-Oct., 



Musonia" costalis new species. (Plate X, figs. 3 and 4.) 



This species is a quite interesting one, being on the borderland 

 between the genus Musonia{Promusonia GigUo-Tos'-) and Musoniella 

 GigHo-Tos, but apparently nearer the former assemblage. When 

 compared with a St. Laurent cotype of Chopard's Mionyx fusces- 

 cens,^^ which is a member of the restricted genus Musonia and to 

 which the new form is closely allied, costalis is seen to differ most 

 .strikingly in the deeper frontal shield, the shorter and broader pro- 

 notum, this showing Musoniella tendencies, the strongly infuscate 

 marginal field of the tegmina, which has a strikingly marked pale 

 line on the costal margin, and in the infuscate proximal sections of 

 the tranverse veins. The apex of the abdomen is lacking in the 

 specimens seen. From surinama, the genotype, costalis is separated 

 by a number of characters, the shorter pronotum and bicolored teg- 

 mina, with infuscate bases to the cross-veins, being sufficiently dis- 

 tinctive in costalis to separate readily the two forms. 



Type. — cf (presumably); Goyaz, State of Goyaz, Brazil. [Hebard 

 Collection, Type no. 217.] 



Size small: form moderately elongate. Head much wider than 

 the pronotal expansion, when seen from the cephalic aspect strongly 

 transverse, the greatest depth contained one and one-half times in 

 the greatest width: occipital line between the juxta-ocular sulci 

 straight transverse, between the juxta-ocular sulci and the eyes the 

 margins is slightly declivent and developed into low obtuse-angulate 

 lobes, from the side the longitudinal angle of the occiput is seen 

 to be slightly acute: oceUi large, but little separated, placed in a, 

 reversed, slightly depressed triangle: facial shield strongly trans- 

 verse, the greatest depth contained two and one-half times in the 



^^ We have nothing to add to our previous remarks regarding the generic name 

 Paramusonia (Proc. U. S. Nat. Mus., XXVII, p. 567, footnote, (1904)), the indi- 

 cated type of which is Thespis cubensis Saussure. Relative to GigHo-Tos' genus 

 Diainusonia, based on Mantis parva Drury, all we can say is that we do not 

 know the genotype, but we have a male of his species media from Caparo, Trin- 

 idad (April, 1913, S. M. Klages, [Hebard Chi.]) before us. However, the generic 

 name cannot be maintained, as in February, 1904, the present author first defin- 

 itely designated (Proc. U. S. Nat. Mus., XXVII, p. 56-5, footnote), the type of 

 Thespis Serville as Mantis parva. In consequence the name Diamusonia must 

 give place to Thespis Serville. Our species Paramusonia seclusa (Proc. Acad. 

 I\at. Sci. Phila., 1913, p. 29.5, fig. 7, (1913)), from Alto Pencosa, Argentina, has 

 been referred by Giglio-Tos (Bull. Soc. Entom. Ital., XLVII, p. 6, (1916)), to 

 his genus Promusonia {=Musonia Stal), but a re-examination of the type shows 

 no reason for us to change our assignment, as it does not appear generically 

 separable from cubensis, the genotype of Paramusonia. 



^n^ide Rehn, Proc. Acad. Nat. Sci. Phila., 1918, p. 167, footnote 27, (1918). 



" Ann. Soc. Entom. France, LXXX, p. 333, (1911). [St. Laurent, La Fores- 

 tiere and Nouveau Chantier, French Guiana.] 



