242 NORTH AMERICAN EUMASTACINAE (oRTHOPTERA) 



PSYCHOMASTAX8 new genus 



A striking new genus related to Masyntes Karsch and Morsea 

 Scudder, more nearly related to the latter, but having some im- 

 portant features resembling those of Masyntes. The genus is 

 characterized chiefly by its relatively robust, apterous form; 

 the distinct fastigium, which is but moderately produced; the 

 weakly convex facial line; the broad frontal costa, somewhat 

 broader dorsad; pronotum ample, with caudal margin of disk 

 emarginate mesad; the lateral lobes of pronotum deep, rounded 

 (cf) or sharply rectangulate ( 9 ) at the ventro-caudal angle; 

 ovipositor jaws of normal type; male cerci simple, styliform and 

 subgenital segment of the male composed of three parts. 



From Masyntes (genotype, M. gundlachi) the present genus 

 can be distinguished by the uniseriate character of the spine series 

 on the dorsal margins of the caudal tibiae (in this resembling 

 Morsea), the less produced and less elongate (dorso-ventrad) 

 head, in the broad but shallowly excavate frontal costa, in the 

 cjdindricalh^ incrassate distal half of the antennae, in the rec- 

 tangulate ( cf and 9 ) f astigio-f acial angle when seen from the 

 side, in the deep, corcelet-like pronotum (which Morsea more 

 nearly approaches), the caudal margin of the disk of which is 

 emarginate and not produced or truncate as in Masyntes, in the 

 absence of tegmina and wings (in this respect similar to Morsea) , 

 in the interspace between the mesosternal lobes being approxi- 

 mately twice as wide as the lobes themselves (instead of but little 

 wider), in the simpler and more normal ovipositor jaws, and in the 

 simple, styliform cerci of the male. 



From Morsea (genotype, M. californica) the new genus differs 

 in the robust and less attenuate form, the shorter and broader 

 head, the rectangulate fastigio-facial angle when seen from the 

 side, in the broader and simpler fastigium when seen from the 

 dorsum, in the much broader and more shallowly excavate, as 

 well as in general more subequal, frontal costa, in the antennal 

 tooth being present on the ninth segment, in the ventro-caudal 

 angle of the lateral lobes of the pronotum being distinctly an- 

 gulate in the female, in the simple styliform cerci of the male, in 

 the absence of a linguiform process on the dorsal section of the 

 subgenital segment of the same sex. 



8 From \pvxv spirit, and Mastax. 



