J. H. MERRILL 129 



more yellow upon it than the female. The dark spot on the 

 face just above the clypeus may or may not be present. The 

 antennae are dark-brown but lighter beneath toward their tips. 

 The upper margin of the prothorax is marked by yellow and 

 this color may in some instances form a border around it, leaving 

 a polished black spot in the center. Beneath the fore-wing is 

 a raised yellow spot. Just below it and extending backward 

 to the mesoepimeron and nearly down to the sternum is a yellow 

 area. This area maj^ be partly divided into two by a darker 

 stain running through it. The prescutum is yelloAvish-brown 

 and from it two bands of yellow or light brown pass backward 

 over the mesonotum throughout its whole length, and it may be 

 also more or less completely margined by the same color. A large 

 yellow spot starts on each side of the metathorax at its upper 

 margin and extends dorsally, covering the pleura of the propo- 

 deum and nearly meeting the other on the notum. Jast before 

 the hinder margin of the notum of the second and sometimes 

 of the third abdominal segment is a narrow transverse yellow 

 band. The rest of the abdomen is brownish-black, lighter in 

 spots. M. atrata may be distinguished from lunator by the 

 absence of clouded areas in the fore-wings, from M. greenei by 

 its fusco-hyaline wings, and from nortonii by receiving the recur- 

 rent nervure in the middle of the areolet. 



Megarhyssa canadensis (Cresson) 



(Rhyssa canadensis Cresson, Can. Ent., i, 1885, p. 35, 9 . 



Location of type.— In the collection of the American Entomo- 

 logical Society of Philadelphia. 



The female of this species is about half an inch long with an ovipositor 

 slightly longer than the body. The head is dark bro^\-n to black. The facial 

 orbits are marked with a yellowish-white band interrupted at the point of 

 insertion of the antennae and ending at the vertex. The posterior orbits 

 in the hghter colored specimens are marked by a lighter broNvTi. The palpi 

 are whitish. The dark portion below the antennae is slightly raised medially 

 and the whole is irregularly, transversely, striated. The antennae are dark 

 brown becoming lighter and somewhat larger toward their tips. 



The thorax is dark brown to black and its sides are clothed with numerous 

 short, erect, whitish hairs. The tegulae are yellowish -white. The meso- 

 scutellum and metascuteUum (or postscutellum) are transversely striated. 

 The sides of the t*horax are highly poUshed and in the mesothorax are densely 

 punctured. In the hghter specimens the prothorax is marked with a hghter 



TRANS. AM. ENT. SOC, XLI. 



