ORTirOPTERA OF INDIANA. 327 



half as wide as the basal half; the lower prong (heel of the boot) 

 being only a rounded, downward projecting lobe. Fureula absent. 

 Sub-genital plate short and broad, the apical margin thickened. 

 (See Fig. 16, Plate II.) 



Color: A nearly uniform dark brownish green, or olive brown 

 above, yellow beneath. The transverse sulci of pronotum and pleural 

 incisions black, as are also one or two small patches on the upper 

 half of lateral lobes of pronotum. Tegmina olive brown, immacu- 

 late. Hind femora, either dull or bright yellow, the outer face with 

 narrow black marks arranged herring-bone fashion, the upper, inner 

 face with three oblique black bars. Hind tibiffi yellow, with a narrow 

 black basal ring, the spines black. 



Measurements: Length of body, male, 30 mm., female, 44 mm.; 

 of antennjB, male, 17 mm., female, 15 mm.; of pronotum, male, 7 

 mm., female, 10 mm.; of tegmina, male, 29 mm., female, 32 mm.; 

 of hind femora, male, 18.5 mm., female, 22 mm. 



This is the largest and at the same time one of the most common 

 and destructive of our Melanopli. It occurs throughout the State, 

 having been taken in every county in which collections have been 

 made. In central Indiana it begins to reach maturity about July 

 25th, and may be found in favorable seasons until December 1st. 

 In late autumn the females are always worn and bedraggled, while 

 many of the males are bright colored and evidently freshly moulted. 

 The species becomes darker with age and those which mature in 

 autumn are darker than those of midsummer. 



In Indiana, the lubberly locust delights in low, damp waste places, 

 such as the margins of lakes and ponds, the borders of streams, fence 

 rows and the margins of low-land cultivated fields. It is especially 

 fond of the greater rag weed, Amhrosia trifida L., of the river bot- 

 toms, and is often seen by scores feeding upon its leaves, or mating 

 among its foliage. The various species of smartweed, Polygonum, 

 which grow in shallow water, are also much frequented by it in early 

 autumn. On October 2, 1894, vast numbers were seen along the 

 edge of a field of low-land corn, the leaves of the marginal rows of 

 which they had almost wholly destroyed. When a stalk was ap- 

 proached they did not desert it but dodged quickly around to the 

 opposite side, much as does a squirrel around the trunk of a tree 

 when pursued. If, however, one took alarm and jumped, all the 

 others in the immediate vicinity did likewise. 



On one occasion a specimen of differ entialis was found feeding 

 upon a dead example of DicromorpJia viridis, half or more of the 

 abdomen of the latter having been devoured. The Logger-head 



