CHARLES W. HOOKER. 119 



Thyreodon morio Ashmead, Smith's Cat. Ins. N. J., p. 580 1900. 



" Dalla Torre, Cat. Hym., Ill, p. 186 1901. 



" " Eliot and Soule, Caterpillars and their Moths, 



p. 57 1902. 



" Howard, Insect Book, pi. 10, fig. 15 1904. 



" " Szepligeti, Gen. Ins., Hym.,34me Fasc, p. 25. ...1905. 



" Viereck, Trans. Kans. Acad. Sci., p. 313 1907. 



•' " Fletcher and Gibson, 39th Rept. Ent. Soc. Ont., 



p. 112, Stonewall, Manitoba, July 1909. 



" Morley, The Entomologist, XLII, p. 136, n. 100, 



June 1909. 



Black ; face and legs sometimes more or less flavous or tinged with 

 ferruginous; antennce orange-fulvous, the base and apex sometimes 

 fuscous. 



Length, 25-35 mm. ; wing, 16-25 mm. ; spread, 34-53 mm. ; antennae, 

 16-23 mm. 



Black ; face, mouth parts and legs sometimes more or less flavous 

 or tinged with ferruginous ; head and thorax densely and finely punc- 

 tured and clothed with fine, short, pubescence ; vertex somewhat 

 rugose, with ocelli small, distinct, fully twice their diameter from the 

 tops of the eyes, a median keel running from the anterior to or below 

 the base of the antennae ; eyes large to medium, slightly emarginate ; 

 antennae orange-fulvous with the scape and apex sometimes fuscous or 

 black ; clypeus pointed in front ; clypeal foveae deep. 



Thorax black, densely punctured and clothed with short black pubes- 

 cence; thoracic sutures distinct, often crenulated ; mesonotum with 

 parapsidal furrows more or less distinct ; pleurae and pectus shining ; 

 wings fuliginous ; nervulus postfurcal to interstitial ; nervellus broken 

 well above the middle. 



Legs normally black, sometimes more or less flavous or tinged with 

 ferruginous ; claws pectinate ; abdomen shining black, sometimes with 

 a little dark ferruginous ground color showing through. 



In describing this species I have examined over 100 speci- 

 mens from all parts of the United States. 

 Type. — Location unknown. 



This common species is easily recognized by its orange- 

 fulvous antennae and usually entirely black body. The head 

 and legs are sometimes more or less flavous or fulvous, and 

 in the subspecies transitionalis a clear spot appears in the 

 wings, but just how constant this is can not be stated. T, 

 snowi Vier. is also closely related and may prove to be only 

 a subspecies continuing the variation begun in T. morio transi- 

 tionalis, but as I have not seen the type or a specimen of this 



TRANS. AM. ENT. SOC, XXX VIII. 



