304 APPENDIX. 



Inhabits St. Peter's river. 



Head above somewhat fulvous ; beneath and front yel- 

 low ; thorax, first segment yellowish-brown, blackish each 

 side and before ; second segment pale brownish, a little 

 tinged with rufous and with indistinct oblique whitish 

 lines, proceeding from the longitudinal impressed line ; two 

 brown spots on the middle placed transversely ; unngs 

 hyaline, wliitish, with fuscous nervures ; posterior margin 

 of the inferiores fuscous ; tergum fuscous, lateral margin 

 whitish ; posterior edges of the segments white above ; a 

 double series of whitish, oblique, dilated, abbreviated lines. 



Length ? to tip of the wings one and three-tenths of 

 an inch. 



This is much the largest species of this country I have 

 seen, it appeared in considerable numbers. 



2. B. alternata. Wings whitish, nervures fuscous 5 ter- 

 gum fuscous, segments whitish at their bases. 



Inhabits North-west Territory. 



Body fuscous j head on the anterior margin and gcnsR 

 white ; thorax pale brownish-livid, yellowish near the scu- 

 tel ; wings hyaline, with a whitish reflexion, nervures not 

 margined ; pleura and pectus varied with yellowish ; feet 

 pale ochreous, a fuscous annulus near the tip of the thighs; 

 tergum fuscous; segments whitish at base, one or two ul- 

 timate segments with two whitish longitudinal lines ; ven- 

 ter whitish, each segment with two oblique lines and two 

 intermediate points, black ; seta whitish, with regular fus- 

 cous spots alternating. 



Length of the body ^ from two-fifths to half an 

 inch. 



Closely allied to the /emoratuSf nobis,* but may be dis^ 



• Western Quarterly Reporter, vol. 2. p. 162. 



