REVISION OF THE ORTHOPTEKAN GENUS TRIMERO- 



TROPIS. 



By Jerome McNeill. 



The subjoet of the present paper is a moderately homoo^eneous 

 group of species belonging to the subfamil\' Oedlpoduue stirps Oedi- 

 podltes Saussure. which is distinguished from other Oedipodinw. \)\ 

 having the outer distal spine of the posterior tibiae remote from the 

 apical spurs and the ocelli adjacent to the eyes. Trimerotropii^ 

 belongs to a group of genera convenientl}' if not naturally separated 

 from the rest of the stirps by having the median carina of the prono- 

 tum cut by two transverse sulci. It may be separated from the North 

 American genera which share this character by the following key: 



ANALYTICAL KEY TO TRIMEROTROPI8 AND ALLIED GENERA. 



a ^ Three-fourthy or more of the cells of the distal half of the middle field of the 

 tegmina regularly quadrilateral, arranged in a single row on either 

 side of spurious longitudinal veins (Plate XXI, fig. 3 H) . Inner edge 

 of the fuscous band, if present, within or at least not far beyond the 

 middle of the wing, 

 b ^ Intercalary vein nearly straight and about the middle of the median area 

 distally (Plate XXI, fig. 6), or if much in advance of the middle dis- 

 tally with one row of cells on either side (Plate XXI, fig. 3 /). Scu- 

 tellum of the vertex (without the central foveolpe) never much longer 

 than broad and generally broader than long. INIedian carina of the 

 pronotum cut by the principal sulcus about the middle, rarely the 

 metazone may be as much as one and a half times as long as the pro- 

 zone, 

 c' Antennae longer than the posterior femora, swollen and strongly depressed. 

 Frontal costa at its widest point above the ocellus narrower and at the vertex 

 very much narrower than the greatest width of the anteniiie. 



Psl)iid)(i 8tal. 

 r^ Antennje filiform. 



d ^ Posterior angle of the lateral lobes of the pronotum never broadly rounded, 

 • but extended backward and downward so that the lower margin is 

 somewhat straight and meets the posterior margin at an acute angle. 

 Cranium between the eyes without transverse carinje. 

 e^ Head swollen and not strongly elevated above the disk of the pronotum. 

 Eyes not very prominent, and even in the male plainly shorter than 

 the genal groove. Cranium between the eyes broader than their 

 diameter seen from ab()\"e. 



Proceedings U. S. National Museum, Vol. XXIII— No. 1215. 



393 



