390 PROCEEDINGS OF THE ACADEMY OF [Sept., 



Trimerotropis salina McNeill. 



Colorado Springs, Colorado, Aug. 17, 1 cJ*. Knob Hill, Colorado 

 Springs, Aug. 17, 3 ? . 



These specimens are slightly larger than the measurements given by 

 McNeill, but we have placed them here chiefly on account of the poorly 

 contrasted tegminal bars and the broad wing band. The lateral face 

 of the caudal femora presents a median bar of varying intensity in 

 several specimens. The coloration {i.e., blackish bars and suffusion) 

 of the ventral sulcus of the caudal femora appears to be too variable 

 to be given the prominence assigned to it by McNeill. The male 

 individual here studied would be placed in another section of the 

 vinculata group on the femoral coloration, while it unquestionably is 

 the same as the three females which have the coloration as described 

 by McNeill. Instances such as this are by no means confined to this 

 species, but can be found in most any large series of a species of the 

 genus. 



Trimerotropis fratercula McNeill. 



Daileys, Park Co., Montana, Aug. 4, 13 d^, 6 9 . Sphinx, Park Co., 

 Montana, Aug. 4, 1 9 , Fountain, Lower Geyser Basin, Yellowstone 

 Park, Aug. 6, 6 d^, 6 9. Upper Geyser Basin, Yellowstone Park, 

 Aug. 7, 3 d^, 4 9 . Mud Volcano, Yellowstone Park, Aug. 10, 1 cJ^. 

 Emerald Spring, Yellowstone Park, Aug. 7, 1 9 . Yellowstone Lake, 

 Yellowstone Park, Aug. 7 and 10, 1 d^ , 1 9 . 



This series is assigned to this species with some little doubt. Some 

 affinity exists with T. inconspicua Bruner, at least as far as published 

 diagnostic characters are concerned. The coloration of the ventral 

 sulcus of the caudal femora varies in individuals from the same locality 

 and not separable by any other character. Some present a solid 

 blackish sulcus with a distinct light pregenicular annulus, others have 

 a well-marked additional light median bar, and a number of specimens 

 have the black interrupted on the sides of the sulcus but undivided in 

 the middle. The evidence of this series of forty-three specimens of 

 unquestionably but one species is that the coloration of the sulcus 

 of the caudal femora is of little or no diagnostic importance. The 

 coloration of the lateral and internal faces of the caudal femora are 

 also unstable, in the authors' opinion, while the intensity of the tegminal 

 bars and the width of the wing bars are by no means as stable as would 

 be supposed from the importance given them as diagnostic characters. 



The series studied presents some variation in size, the males from 

 Fountain being somewhat larger than males from Daileys (length 

 including tegmina: Fountain 28.5 mm., Daileys 25), while the Mud 



