226 NORTH AMERICAN EUMASTACINAE (oRTHOPTERA) 



MORSEA Scudder 



1898. Morsea Scudder, Psyche, viii, p. 179. 



1899. Morsea Burr, Anal. Soc. Espan. Hist. Nat., xxviii, pp. 95, 277. 

 1899. Morsea Scudder, Proc. Davenp. Acad. Nat. Sci., viii, p. 18. 

 1901. Morsea Bruner, Biol. Cent.-Amer., Orth., ii, pp. 22, 24. 



1903. Morsea Burr, Gen. Insect., Orth., Eumastac, pp. 15, 17. 



1909. Morsea Rehn and Hebard, Proc. Acad. Nat. Sci. Phila., 1909, p. 420. 



1910. Morsea Kirby, Syn. Catal. Orth., iii, p. 79. 



Genotype: Morsea calif arnica Scudder. 



Description of Genus. — Form elongate, slender, apterous. Head 

 deep, narrow; face declivent; fastigium in profile acute-angulate, 

 from dorsum projecting cephalad of eyes a distance not more 

 than one-half of its width, margin of apex of fastigium entire, 

 not divided, subtruncate; occiput and fastigium with a distinct 

 but low medio-longitudinal carinula: frontal costa very narrow, 

 subequal in width mesad and ventrad, widening regularly from 

 the paired ocelli to fastigium: eyes large, very prominent in male: 

 antennae thirteen-jointed, slender immediately distad of first 

 and second joints, thence depressed and spatulate or subspatulate, 

 apex briefly acute, ventral tooth on tenth segment. Pronotum 

 distinctly (cT) or weakly (9) longitudinal, dorsum tectate in 

 female, more arcuate transverse in male; distinct median carina 

 indicated, no true lateral carinae present, discontinuous and 

 faint ridges giving a semblance of lateral carinae; caudal 

 margin of pronotal disk with median V-emargination of 

 variable distinctness. Apex of male abdomen recurved: supra- 

 anal plate deflexed, elongate trigonal; cerci compressed, with 

 falcate distal sections; subgenital plate short, forming a chitinous 

 arch bearing a median linguiform process, this abruptly directed 

 cephalad along the body axis and between the cerci. Interspace 

 between the mesosternal lobes strongly transverse, narrowing 

 cephalad; mesosternal lobes contiguous. Limbs slender: caudal 

 femora with apices of genicular arches and dorsal carinula spini- 

 ferous, genicular lobes very minutely spinulose: caudal tibiae 

 with spines of each series uniform in length, those of internal 

 series shorter than external, internal distal spurs distinctly longer 

 than external: caudal tarsi elongate, proximal joint but faintly 

 shorter than second and third joints united; large arolia present. 



