XXI. CRABRO. 171 
central longitudinal incisure which, as well as that which encloses 
it laterally and in front, is consute; the posterior portion of the 
metathorax somewhat transversely striated; the collar with a 
dot on each side, and the tubercles yellow; the tegule testaceous ; 
the wings hyaline, iridescent, their nervures piceous; the legs 
yellow, with the anterior femora black behind, and ferruginous 
beneath, their tibize with a black stain below, the intermediate 
black behind, their tibiz also with a black stain beneath, the 
posterior femora entirely black, their tibia with a black stain at 
the apex above, the anterior and intermediate tarsi of a pale 
yellow, with the terminal joint rufo-piceous, the posterior ones 
piceous, with their basal joint yellow. 
The abdomen elongato-conical, black, subpubescent; the 
margins of the segments testaceous, and the apex of the anal 
segment ferruginous ¢. 
The 9 I am unacquainted with. 
g in my own Collection. 
+4 This very distinct Crabro is unique in my Cabinet, 
to which it was kindly presented by F. Walker, Esq., to 
whom I have the pleasure of dedicating it; it and the 
Crossocerus luteicollis of St. Fargeau are the only ones of 
the genus that I am acquainted with, that have yellow 
markings on the face between the eyes. This insect will 
not enter into any of St. Fargeau’s divisions ; it approaches 
most to his Crossocerus, div. 2.; but its prothorax or 
collar is not “ anguleux,” nor are its antenne “ garnis 
dune frange de poils,” and the “ appendice de la radial” 
runs parallel to the anterior margin of the wings. 
Sr. 30. aLBinaBRis. Fab. 
niger, stemmatibus in lineam curvam positis, capite thoracis 
latitudine, metathoracis basi longitudinaliter striato, abdomine 
ovato-conico, nigro-viridi ; $ capite mutico. 
length 23—3 lines. 
