316 REPORT OF STATE GEOLOGIST, 



Measurements: Length of body, male, 20 mm., female, 24 mm.; 

 of antenna, male, 9 mm., female, 8 mm.; of pronotum, male, 5 mm., 

 female, 5.5 mm.; of tegmina, male and female, 20 mm.; of hind 

 femora, male, 12 mm., female, 13 mm. 



This is a very common locust throughout the State, having been 

 taken in every county in which collections have been made. It be- 

 gins to reach maturity the latter part of May — May 27th and 30th, 

 Vigo County; May 31st, Marion County — and from then until late 

 November may be noted almost anywhere in open blue-grass pastures 

 and woods, borders of roadsides and cultivated fields, meadows and 

 lawns. Numerous examples have been found pairing as late as No- 

 vember 22d, and it may be that there are two broods each season. 

 In late spring and early summer they are often seen resting on iron- 

 weeds and thistles in company with M. gracilis, M. luridus and other 

 species. The cast off skin of their final moult is often noted on such 

 weeds, showing tliat the nymph climbs thereon to change its gar- 

 ment of youth for one of maturity. 



Atlanis is very often found associated with the more common M. 

 femur-ruhrum and is considered that species by most persons who 

 deign to notice such a thing as a locust. The male, however, may bo 

 readily distinguished from that of femur-ruhrum by the notched apex 

 of sub-genital plate, the shorter and less tapering cerci, and by the 

 greater relative length of the tegmina, which extend one-fourth or 

 more their length beyond the tip of abdomen. The dark spots on 

 tegmina are also larger and more distinct in atlanis. The female of 

 atlanis may be known by the yellow color of the under side of ab- 

 domen which in femur-ruhrum, is reddish brown; and also by the more 

 distinctly banded hind femora. The earlier specimens of atlanis are, 

 in general, lighter colored and have relatively longer tegmina than 

 tliose of late autumn, which are very dark gray in hue. The species 

 ranges over most of the United States and Canada. 



6.S. Melanoplus impudicus Scudder. 



Mrlmiophis i)np>i,1irm Scudd., 17 9, XXXVI, 1897, 22, 32; Id., 18 1, 

 1897, i;U, 204, Plate 14, Fig. 1; Id., 188, 19()(), 60. 



Size, medium. Vertex slightly swollen, distinctly elevated above 

 the pronotum; the interspace between the eyes as broad (male) or 

 one and a half times as broad (female) as the first joint of antennae; 

 the front half strongly sloping, feebly sulcate in both sexes. Frontal 

 costa short, not reaching clypeus, narrow, feebly or not at all sulcate. 

 Antennae short, two-thirds as long as hind femora. Pronotum ex- 

 panding but little (male) or more distinctly ( female) on metazona. 



