180 GEO. D. HULST. 



antepenultimate segments is armed with short spines, about twelve 

 in number. Venation: fore wings 11 veins, 4 and 5 always stemmed, 

 sometimes quite short, 10 separate; hind wings 7 veins, 2 )iear angle, 

 3 and 4 always stemmed, 6 and 7 separate, 8 always separate from 7. 

 This genus is close to Fsorosa ZelL, differing principally in the 

 stemming of 4 and 5 of fore Avings, which, after a study of forty or 

 more examples of the type, seems to be entirely constant; it differs 

 also in the armature of the abdomen of 9 beneath; the tongue is 

 also much shorter. 



Synopsis of Species. 



Fore wiugs brownish black ; lines broad, even white Iiaillinoildi. 



" dark gray; lines fine dentate uliiiiarrosorella. 



1. V. uliniarrosorella Clem., Proc. Acad. Nat. Sci. Phil. 1860, p. 205 

 {Nephopteryx); Grote, Bull. Geol Surv. Terr, iv, 1, 1878. 



pneiimateUa Hulst, Ento. Am. iii, 137, October, 1887 (Stenoptycha) . 

 ulmella Rag., Diag. N. A. Phyc. p. 13, December, 1887 {Psorosa). 

 fuscntella Hnlst, Ento. Am. iv, 118, 1888. 



Expands 18 mm. Head blackish gray. Thorax fuscous gray. Abdomen with 

 segments ringed, dark fuscous in front, light fuscous behind. Fore wings blue- 

 gray, quite even in color over the wing. A small white spot at centre of basal 

 field, sometimes obsolete. Basal cross line well out, wavy angulate, shadowed 

 by black outwardly, which is heavier and more difi'use near costa. Two black 

 discal points, generally confluent, often followed by white. Outer line fine, 

 white, aiigulated from costa first inwardly then outwardly, then nearly straight 

 to inner margin, shadowed inwardly and outwardly with black, the inner line 

 being the heavier. A n)arginal line of black points. Hind wings smoky to 

 ocher fuscous, subpellucid. Beneath fuscous, the outer Hue of fore wings evident ; 

 hind wiugs as above. 



Food-plant the American Elm. Maine, New York, Pennsylvania, 

 Missouri, Wisconsin, Texas, Illinois, low^a. 



I have no doubt that the above synonymy of this species is correct. 

 Clemens' type is lost, and his description is very brief, but he gives 

 the food-})h\nt, and taking the two points together I think this his 

 insect. 



Clemens says of the larva : " the larva is found on the American 

 Elm in August. The head is pale brown, dotted with dark brown. 

 The body dark green, with a dorsal double line of pale green patches 

 and a slight dorsal and stigmatal line of the same hue. On the first, 

 second, fourth, fifth and tenth rings are brown, subdorsal points. It 

 weaves a web on the surfiice of the leaves, feeding beneath it. The 

 pupa is contained in a web between united leaves in the vivarium. 

 It becomes a pupa about the middle of August, and an imago about 



