^MB?'] PROCEEDINGS OF THE NATIONAL MUSEUM. 69 



moderately broad oblique brown bauds, internally with the basal half 

 and a single baud in advance of the light yellow preapical annulation 

 black. Posterior tibia? deep eoerulean blue with light basal annulation, 

 spines black-tipped. Abdomen deep blue above in some specimens, in- 

 clining to greenish along the sides; dirty white to gray below. An- 

 tenna? brown, darkest at the apex, with faint anuulations of a lighter 

 brown. 



Length of body, 5,25""", 9,29"""; of antenna?, f, ll mm , 9,10"""; of 

 pronotum, $ , 4.5""", 9,5.8"""; oftegmina, S , 25 mm , 9 , 28.5"""; of hind 

 femora, 5,12""", 9,13.75"""; of hind tibia?, 5,10""", 9,11.25""". 



Hab. — Salt Lake Valley, Utah, near the mouth of Ogden Canon, just 

 at the upper shore line of the ancient Lake Bonneville (Bruner, Dodge). 



Numerous specimeus both male and female. * 



The present species differs greatly in its habits from those of ccerulei- 

 pennis and azurescens, which latter are only to be met with upon almost 

 bare alkali flats and slopes. T. cyaneipennis, on the other hand, fre- 

 quents rather well-clothed surfaces among the rocky talus of mountain 

 sides, where it is found in company with Pycnodyctia Wheeleri"? Thos., 

 also a blue-winged (Edipodini. 



Trimerotropis azurescens sp. iiov. 



This form differs from T. cceruleipennis Bruner, with which it has 

 hitherto been confounded, in the entire absence of all traces of the 

 band on the wings, as also in the structure of the pronotum. It is 

 also a sleuderer and longer winged insect than that species. 



Vertex between the eyes very broad, depressed, and quite deeply 

 sulcate, with the median carina nearly as prominent as the bounding 

 walls ; the pit at the extreme vertex very well defined but not quite 

 so deep as in cceruleipennis. Eyes not quite as prominent as in that 

 species, and with the frontal costa not so deeply sulcate as there. Pro 

 notum with the anterior lobe plain above, the median carina nearly 

 equal throughout; posterior edge a little less than a right-augle. 

 Wings a little more ample than in cceruleipennis, with the nerves of the 

 outer half of the post-axillary field very irregular. Posterior femora 

 shorter and narrower thau in that species, and the antenna a little 

 heaver and longer than there. 



General color light grayish yellow varied with brown. The teg- 

 miua usuaily quite evenly flecked with quadrate fuscous spots, which 

 in some specimens have a tendency of gathering into groups as in cceru- 

 leipennis. Wings very delicate diaphanous e<erulean blue on the im- 

 mediate basal portion from which point the color gradually fades out- 

 ward, without the slightest indication in cell or vein of the usual dusky 

 band — being the only species of the genus entirely without a trace of 

 this character ; veins and cross veins black except at the immediate 

 base and a small space on the axillary field towards the apex. Poste- 

 rior femora dimly banded externally ; internally, alternately yellow and 



