THE CANADLA.N ENTOMOLOGIST. 55 



for a narrow anterior and a broad posterior band ; the abdomen has a 

 series of large quadrate fuscous spots along the sides (female) more or 

 less replaced by bright red (male); the dorsal surface of the abdomen 

 and less frequently the disk of the pronotum and the top of the head are 

 bright yellow or brownish-testaceous ; ventral surface of the abdomen 

 more or less distinctly yellow, with the last two segments in the male red. 

 Length: male, 22 mm; female, 38 mm.; tegmina: male, 7 mm ; female, 

 gyo mm.; hind femora: male, 151^^ mm.; female, 23^ mm. Fourteen adult 

 males, twenty adult females, seven pupae, from the summit of Sulphur 

 Springs Mountain, on the Ime between Boone and Newton counties. 



This species is so different in the position of the principal sulcus of 

 the pronotum and in the character of its posterior margins from the other 

 species of Boopedo7i as to perhaps deserve to constitute a genus by 

 itself Its occurrence is quite remarkable. Sulphur Springs Mountain 

 stands probably as much as a thousand feet above the valley, and with 

 the exception of two or three neighbouring mountains, it decidedly over- 

 tops all the surrounding country. This mountain is a high ridge, proba- 

 bly one and a half miles long at the summit. At either end there are 

 considerable prominences, composed of massive millstone grit. One of 

 these is surrounded by clifts on all sides, so that the top can be reached 

 with some difficulty ; the other has the clifts broken down in places, so 

 that its summit is much more readily accessible. On both of these a 

 tall coarse grass grows luxuriantly, and among this grass this species was 

 found in abundance over the iit\s square yards of the least accessible 

 peaks. A single male was found on the other peak. As several days 

 were spent in collecting in this vicinity, and as particular pains were taken 

 to secure all the specimens possible, and since no other specimens have 

 been found elsewhere, though seven weeks were spent in the summer of 

 1897 by the writer and a party of three others in collecting in North- 

 western Arkansas, it is reasonable to conclude that this species is an old 

 resident which has inhabited the country since the times when the 

 Ozark plateau was a level plain. As erosion carved out the valleys, the 

 level surface was more and more restricted in areas until at the present 



time it is represented by the summits of the highest mountains. In this 

 way auriventrisi which is a grass-loving prairie species, has been 

 hemmed in by the encroaching forests until it now maintains a precarious 

 foothold on a few isolated mountain summits. Under such circum- 

 stances wings would be a disadvantage, so they have been shortened by 

 natural selection. 



