-76- 



above; the appendages are eherry-red at base, paler above, but 

 towards the end on the distal two-thirds blackish. In front are 

 two reddish i)arallel stripes. The body is pale beneath, above 

 pale jjreenish vellow, the ^^(.l and yth abdominal segments cherry- 

 red, including the sides, low tiown, of the 6th segment. From the 

 I St thoracic to the end of the body are three parallel lateral, 

 linear, redtlish lines, the lowermost being obsolete posteriori). 

 'I'he <Sth abdominal segment is convex above, but not humped. 

 The suranal plate is small, narrow, but distinct, rough on the 

 surface and dark, almost blackish. Behind, at the base of the 

 tails are two piliferous warts; the tails themselves are as long as 

 the three last segments (8-10) taken together, and are of uniform 

 thickness, ringed with dark red, sparsely setiferous, with two or 

 three hairs at the e\M\ ; they each end in a cylindrical swollen 

 flagellum at each end, somewhat barrel-shai)ed, with a deeii red 

 ring in the middle, the end being clear and transparent. All over 

 the body the piliferous warts and hairs are minute. 



It rests with the body curved around so that the head nearl\- 

 touches the tails, the last three segments and tails l)eing held up 

 in the air, or extended and then gracefully thrcnvn into the air. 



ANOTHER LEAF-MINER OF POPULUS. 



B\' C. H. Tvi.KR ToWXSKXD. 



In the picturesque little canon called Canada Alam(>sa, which 

 runs several miles northwest from the town of the same name, in 

 Sierra County, N. Mex., and opens out on the plain at Ojo, 

 Caliente, there grows a species of cottonwood with a narrow and 

 smaller leaf than that of y. frrmontri. The latter is the onl\- 

 species found in the bottom lands of the Rio (irande in tlu' 

 southern part of New Mexico. This narrower leafed species is 

 P. angustifolia. It also grows in the region of the Mimbres river, 

 in (irant County, N. Mex., or a species very like it, and seems to 

 inhabit valleys of streams in the somewhat higher region to the 

 west of the Rio drande vallc) . 



Trees of this species in the Canada Alamosa were found, June 

 17, 1892, to be infested with a small leaf-miner, much smaller than 

 the leaf-miner of /^. /"/vw/v/Av described from the Mesilla valley of 

 the Rio(irande (/oe, \'ol. in, pp. 2,^4-236, Oct. 1892), which by the 

 way is a sawfly and not a tineid as at lirst suggested. 'l"he mine. 



