292 THE CA^ADUN ENTOMOLOGIST. 



ON A SEEMINGLY MICROLEPIDOPTEROUS LEAF-MINER OF 

 THE NARROW-LEAFED COTTONWOOD. 



BY C. H. TYLER TOWNSEN15, KINGSTON, JAMAICA, W. I. 



In the same leaves of Populus angnstifolia in which were found the 

 tenthredinid (lepidopterous ?) leaf-miners,* in the Canada Alamosa, north- 

 ern Sierra county, N. Mex., in June, 1892, there were also found specimens 

 of a very distinct leaf-miner. It bears a striking resemblance to the leaf- 

 miner of the vine found in the Mesilla valley of the Rio Grande. It 

 possesses the sucker-like mouth of that miner. After being mounted in 

 glycerine on a slide for several days, however, the outer portion of the 

 distended sucker-like organ became transparent, exposing within what 

 appear to be two stout rounded mandibles with teeth on their inner 

 edges. 



Since this miner is footless, and yet possesses toothed mandibles, I 

 infer that it is micro'.epidopterous. It mines on the lower side of the 

 leaf, not being visible from above. 



Description of miner. — Length, 3^ mm. Colour entirely white. 

 Whole larva fleshy, consisting of thirteen segments. Widest anteriorly, 

 narrowing posteriorly. Segments laterally rounded, the anterior ones 

 especially projecting on sides, the body being laterally deeply incised at 

 sutures. Head rather triangular in shape, running to a blunt point an- 

 teriorly, widest behind — where it is less than ; j the width of prothoracic 

 segment. Anterior end of head terminated with a sucker-like organ 

 distally distended, constricted at base into a neck-like junction with the 

 head, enclosing and concealing a pair of apparently corneous jaws or 

 mandibles. Mandibles are a little longer than wide, rounded-oblong, 

 furnished on inner edge with three recurved or posteriorly directed teeth. 

 Antennas springing from anterior lateral edge of head just posterior to the 

 neck-like constriction of the sucker-like capsule which encloses the mouth- 

 parts. The antennas are apparently 4-jointed, but possess some super- 

 numerary bud-like joints. First two joints about same length, the basal 

 one slightly thicker ; third joint less than half as thick and shorter than 

 second, accompanied by two slender bud-like or tooth-like joints which 

 spring from the second joint and are shorter and narrower than third 

 joint. Fourth joint a little shorter and smaller than third, about size of 

 the supernumerary joints just described, accompanied by a shorter super- 



*See nrticle "Another ]e,if-miner of Populus," in Journ. N. Y. Ent. Soc, Vol. I. 



