CHARLES W. HOOKER. 133 



Creek Canon, Arizona, 6,000 feet. U. S. National Museum, 

 Sarcoxie, Missouri ; Jefferson County and Riley County, 

 Kansas. Massachusetts Agricultural College, Amherst, Mass. 

 Minnesota Agricultural College, 9 , Lake Itasca. 



Thyreodon erytlirocerus Cam. 

 Thyreodon erythrocera Cameron, Biol. Centr. Amer., Hym., I, p. 



288, n. 2, pi. 12, fig. 13 1886. 



" erythrocerus Dalla Torre, Cat. Hym., Ill, p. 185 1901. 



" " Szepligeti, Gen. Ins., Hym., 34me Fasc, 



p. 25, n. 6 1905. 



Body and wings black ; antennce reddish, with base and apex black. 



Length, 32 mm. 



Head closely covered with black hair ; vertex almost impunctate ; 

 antennae reddish, with base and apex black ; eyes distinctly margined, 

 the hollow over the antennae with large, curved, transverse striations ; 

 face deeply punctured ; clypeal foveas deep and longish ; mandibles 

 and palpi covered with long brownish hair. 



Thorax opaque above ; mesopleura impunctate and shining ; meso- 

 notum everywhere closely and distinctly punctured, scutellum shining 

 and punctured, but not so closely ; keels in front of the scutellum 

 closely striate ; metathorax opaque, depressed at the base and bulging 

 somewhat at the sides, hollowed in the center behind, the depression 

 widest at the apex ; metanotum closely and transversely, the pleurae 

 more strongly, striated. 



I have not seen a specimen of this species, and can only 

 give the original description slightly rearranged. 



Types. — 9 and cf. British Museum. 



Cameron writes : "This species has the deep black body, 

 wings and reddish antennae (black at the base and apex, of T. 

 morio) Fabr. and T. gracilis^^ Cr., but is probably distinct from 

 either." After carefully considering the variation in the dif- 

 ferent species of Thyreodon I believe that this species is 

 synonymous with T grandis Cress., but as I have not seen 

 the type or a specimen I have preserved it for the present. 



Distribution. — Mexico ; Valladolid in Yucatan. 



* I find no other reference to Thyreodon gracilis, and this is probably 

 a typographical error, the species referred to being T. grandis. It is 

 possible that T. gracilis may have been given as a manuscript name, 

 but it apparently never passed that stage. 



TRANS. AM. ENT. SOC. , XXXVIII. 



