282 REPORT OF STATE GEOLOGIST. 



spot near the apex; the outer face without distinct spots or bands. 

 Hind tibiae obscure yellowish. 



Measurements: Length of body, male, 21 mm., female, 28 mm.; 

 of antennae, male, 10 mm., female, 11 mm.; of pronotum, male, 5 

 mm., female, 6 mm.; of tegmina, male, 24 mm., female, 28 mm.; of 

 hind femora, male, 11.5 mm., female, 15 mm. 



This species has been taken in Indiana only along the south shore 

 of Lake Michigan, in Lake, Porter and Laporte counties, where it is 

 common. It flies rapidly and noiselessly for long distances and, un- 

 less carefully marked down, is very difficult to detect. The darker 

 specimens are always found at some distance from the lake, where 

 there is a scattering vegetation; the light colored ones on the pure 

 sand of the immediate shore. It has been seen nowhere more than 

 a half mile back from the water margin, and then only on the bare 

 crests of the highest sand ridges and dunes. The earliest date on 

 which mature specimens have been taken was July 25th, and the 

 latest October 15th, though they are doubtless to be found both be- 

 fore and after those dates. Its general range is given by McNeill 

 as "Atlantic States from Virginia northward and along the shores 

 of the Great Lakes west to Illinois." 



52. Trimerotropis citrina Scudder. 



Trimerotropis citrina Scudd., 14 7, II, 1876, 265; Id., 168, XXIII, 

 1893, 77; Id., 18 8, 1900, 41; Sauss., 134, 1884, 169; McN., 

 IX, 1900, 31, 35; Id., 9 1, XXm, 1901, 401, 426; Walk., 2 18, 

 XXXrS^ 1902, 1, 4. 



Size, medium or large. Pronotum with the median carina very 

 low; the metazona but little more than one and a half times as long 

 as prozona; the disk flat, except on the prozona, where the sides are 

 raised moderately, and smooth or nearly so; the hind margin decided- 

 ly obtuse angled, the tip rounded. AVings one and three-fourths 

 times as long as broad. 



General color ash gray or yellowish brown, sprinkled more or less 

 with fuscous. The face usually light gray; the tegmina yellowish 

 brown, the dark spots aggregated into three dark crossbars, indis- 

 tinct in the female, plainly visible in the male. Wings pale lemon 

 yellow at base, the fuscous band broad, the width being from one- 

 fourth to one-flfth the length of wing: the sub-marginal ray short, 

 extending less than half way to base. Inner face of hind femora 

 yellow, with three fuscous bands; the lower sulcus yellow with a dis- 

 tinct sub-apical fuscous spot and traces of two others; the outer face 

 plain yellowish brown or gray. Hind tibiae pinkish red, paler at base. 



