ORTHOPTERA OF INDIANA. 283 



Measurements: Length of body, male, 22 mm., female, 30 mm.; 

 of antennae, male, 11 mm., female, 12 mm.; of pronotum, male, 5 

 mm., female, 6.5 mm.; of tegmina, male, 27 mm., female, 34 mm.; 

 of hind femora, male, 13 mm., female, 15.5 mm. 



This is a somewhat larger and more bulky insect than Indiana 

 examples of T. maritima, the male being nearly as large as the female 

 of the latter. In general appearance the two closely resemble one 

 another and are apt to be confounded when they occur together. 



I have taken this species in but one locality in Indiana. This was 

 on a long sand and gravel bar, along the north shore of the Ohio 

 River, a half mile below Vevay, Switzerland County. Here it was 

 common on September 23, 1898, but having no net, I was able to 

 capture but three specimens. Its flight along this gravelly bank was 

 much less prolonged than that of maritima on the more extensive 

 sand beach of Lake Michigan. When approached it would rise 

 straight upward a few feet, and then move lazily and without noise 

 eight to 15 feet, and alight again, always on the bare sand or gravel. 

 The gravel bar was at the foot of a terrace 30 feet or more in height 

 and a quarter of a mile wide, the surface of which was cultivated. No 

 trace of citrina was found on this area, though other locusts were 

 abundant. It has been recorded heretofore from Maryland, Arkan- 

 sas, Texas, Colorado and Nebraska, and therefore is to be regarded 

 as a southern form, which may be found all along the gravelly banks 

 of the Ohio River. 



XXXIV. PsiNiDiA Stal (1813). 



This genus is closely allied to Mesidbregma, the general appearance 

 of our species being very similar. Head with the occiput much ele- 

 vated, the vertex much as in Mestolregma, but the lateral carinse more 

 nearly converging in front; the foveolce smaller, sub-circular. 

 Frontal costa sulcate throughout, the upper half very narrow, the 

 lower half gradually expanding. Antennae, especially those of the 

 male, long; the Joints of basal half strongly flattened, the edges 

 higher than the center. Pronotum strongly constricted in the mid- 

 dle, the disk nearly smooth, the front margin truncate, the hind mar- 

 gin acute angled; the median carina sharp, straight and of equal 

 height throughout, cut by two notches in front of the middle; the 

 lateral carina rather sharp and distinct on the metazona; sub-distinct 

 on the prozona. Lateral lobes of pronotum with the front and hind 

 margins as in Mesfohregma, the lower margin with its front half 

 arcuate, strongly directed upward. Tegmina narrowed, exceeding 



