38 



several times been accredited to Clemens, has very little foundation. 

 Following his description he says: 



Early in October I found the pupa of this insect at Niagara Falls, on the 

 Canada side, under shelter of loosened portions of the bark of American olni. 

 They were inclosed in a cocoon of silk, mixed with particles of bark. On the 

 same tree I took a number of larvae which were ascending the tree to undergo 

 pupation. I did not, howeA'er, obtain imagoes from any of the specimens. 

 The body was nearly uniform in diameter, with the ordinary number of feet. 

 Head as broad as the l>ody and dark green. Body dark green, between the seg- 

 ments yellowish and dotted with yellow ; first rings with two black dots on the 

 sides. 



Doctor Hiilst," after giving the following localities for this spe- 

 cies — '' Canada, Massachusetts, New York, Pennsylvania, Illinois, 

 Virginia, Texas, Colorado, Utah, California '" — states that he has 

 received it from Texas in August and September, and then quotes 

 Clemens^s remarks given above, but omits the important statement 

 that no specimens tvere bred to maturity. The other published ref- 

 erences to the species simply record it as feeding on elm, an error 

 evidently derived from the original reference or from Doctor Hulst's 

 paper. 



Doctor Clemens's description of the larva he found does not accord 

 with the larvse taken on sugar beet, and from which specimens were 

 bred that were identified by Dr. H. G. Dyar, of the United States 

 National Museum, as belonging to this species. Our larvse when 

 fully mature Avere 10 to 18 mm. in length, head slightly narrower 

 than first segment following; ])ale brown in color, darker on tip 

 of clypeus and tips of mandibles, antenna? and palpi paler, almost 

 yellow; body varying from pale green to dirty yellow, paler be- 

 tween segments, usually a single blaclc dot on each side of the first 

 segment; feet all tipped with black. The larva is very transparent, 

 so that the internal anatomy is clearly A'isible. 



The adult measures 12 to 16 mm. across wings when fully spread. 

 Fore wings dark gray, varying to a pale gray, with traces of 

 fuscous and black scales interspersed, a red spot usually present 

 within the basal line, irregular dentate lines along outer margin are 

 darker ; hind wings dark fuscous, shading out darker on outer mar- 

 gin, fringe very pale; thorax with a dark spot on each side near 

 front; abdomen varying from gray to almost black; antenna gray, 

 half the length of the fore wing; palpi varying from white to 

 brownish red, darker at tip. 



Many of the larvae or pupee were parasitized. A dipterous para- 

 site was identified by Mr. D. W. Coquillett as Exorista pyste Walk. 



a 1890 : Hulst, Trans. Amer. Ent. Soc, v. 17, pp. 187-188. 



