134 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



larva mines the leaves of morning-glory {Ipom(ea). I have foand it in 

 Colorado at an altitude of over 6,000 feet. 



Cosmopteryx montisella Cham. (Cin. Quar. Jour. Sci., vol. ii, p. 297). — 

 One of the prettiest species of this splendid genus. 



Batracliedra demensella n. sp.? — Six specimens (2 (J 4 ?) taken at 

 Colorado Springs in June differ so much from two others (1 ^ 1 9 ) 

 taken In the valley of the Upper Arkansas on Cottonwood Creek, near 

 Mount Harvard, in July, that I fail to recognize them as of the same 

 species, while the resemblance is such as to make their separation as 

 distinct species hazardous. I have not seen B. salicipominella Clem., 

 hut I cannot recognize either of these forms in his description. l!^either 

 Lave I seen B. prcmngusta Hw., and the descrij^tion in Ins. Brit., vol. 

 iii (necessarily very brief in a work of that character), is my only means 

 of determining whether my specimens belong to that species. Before 

 I found the specimens from the Upper Arkansas, I had doubtfully re 

 ferred those from Colorado Springs to prceangusta ; but the resemblance 

 of the specimens from Colorado Springs to those from the Arkansas is 

 such that I am unwilling to separate them, while the latter differ so much 

 from the description of prccangiista {loc. cit.) that I am equally unwilling 

 to unite them. Both forms were found among cottonwoods, poplars, and 

 willows. B. prKcingusta is said to sew together the leaves of poplars, 

 while salicipomonella feeds, according to Mr. Walsh, as quoted by Dr. 

 Clemens (Proc. Ent. Soc, Phila., vol. v), in Dipterous and Teuthredinous 

 galls in willow-leaves. Great numbers of these galls were found in wil- 

 low-leaves from the foot of the mountains nearly up to timber-line, and 

 in a few of them a Lepidopterous larva was found, but I have been unable 

 to find my notes upon it, and cannot say whether it is the same described 

 by Mr. Walsh or not. So, likewise, the leaves of cottonwoods, aspens, 

 and willows are sewed together by Lepidopterous larvae up to the limit of 

 the growth of those trees ; but none of these larvse agree at all with Mr. 

 Walsh's description of the larvfe of salicipomonella. Some of them are 

 larvte of GelecMa; some, I think, belong to the Tortrieidw. One of them, 

 a greenish- white larva, with the head and a spot on each side of each 

 segment piceous, approaches nearer to the larva described by Walsh than 

 any of the others. B. salicipomonella evidently resembles prceangusta 

 (as indeed Dr. Clemens states) closely j and in view of the doubt which 

 seems to rest on the food-plant of pra^angiista, and of the habits of the 

 larvi]e of salicipomonella which (on a very similar larva) Mr. Walsh found 

 not only in the two species of galls above mentioned, but also on oak- 

 leaves, I would suggest that all, including the Eocky Mountain species, 

 may belong to one variable species, but for the fact that Mr. Stainton, 

 who has seen both prwangusta and salicipomonella, makes no question 

 (Staint., ed. Clem., pass., p. 261) of their specific difference. 



The specimens taken at Colorado Springs (prccangustaf) are sordid or 

 ochreous white, dusted with dark grayish-brown or blackish scales, the 



