330 EEPORT OF STATE GEOLOGIST. 



lar, widely separated lobes. Sub-genital plate narrow, the apex a 

 little elevated and ending in an obtuse tubercle. (See Fig. 17, 

 Plate II.) 



Fig. 73. Melanoplus bivittalus (Say). Female. One and one-quarter times natural size. 



(After Lugger.) 



Color: Dull olive brown above, yellowish beneath. Face either 

 yellow or olive green. Occiput and disk of pronotum reddish or olive 

 brown. A narrow yellowish stripe extends back from the upper 

 angle of each eye along the lateral carinse of pronotum nearly to the 

 tips of the tegmina; this usually bordered below with blackish on 

 head and lateral lobes of pronotum. Tegmina with often a few fus- 

 cous dots along the discoidal area, but sometimes immaculate. Hind 

 femora dull yellow, more or less infuscated along the upper half of 

 outer face; the lower face yellow; the knees partly infuscated. Hind 

 tibias usually bright coral red, with black spines; sometimes purplish 

 or greenish yellow. 



Measurements: Length of body, male, 28 mm., female, 37 mm.; 

 of antennaj, male, 16 mm., female, 14 mm.; of pronotum, male, 7 

 mm., female, 9 mm.; of tegmina, male, 22 mm., female, 24 mm.; of 

 hind femora, male, IG mm., female, 21 mm. 



This is also a very common locust throughout the State. It begins 

 to reach maturity about June 15th, perhaps earlier in the southern 

 Counties, and has mostly disappeared by mid-September. It fre- 

 quents clover fields, open blue-grass pastures, prairies and roadsides, 

 and is to be found in both moist and dry localities. When flushed, 

 it usually leaps vigorously; seldom flying; and then noiselessly and 

 for a short distance. It delights to rest on the branches and foliage 

 of the iron weeds and other Compositse, and is often found after 

 •death, clinging to them and to tall grasses, where it has fallen a 

 prey to the locust fungus. More than any ofher of our Melanopli 

 it seems to be subject to the attacks of the red locust mite, Trom- 

 bidium locustarum Riley. In August I once noted, in Putnam 

 County,- a large male with a dozen or more of the mites in different 

 stages, attached to the membrane of the inner wings. A female near 



