172 CRABRONID®. 
Fab. E. Syst. 2. 302. 31; V.d. Lind. pt. 2. 55. 28. 
Crabro leucostoma. Panz. F. G. 15. 24. 
Pemphredon albilabris. Fab. Piez. 316. 8. 
Lindenius albilabris. St. Farg. 3. 795. 4. 
Head slightly zneous, punctured; the stemmata placed in a 
curved line on the vertex, the posterior pair having an impressed 
Jine between them extending beyond but not quite to the occi- 
put, another in front of the anterior one, reaching to the centre 
of the face; the antenne black, with the base and apex of the 
scape fuscous ; the inner orbits of the eyes and clypeus covered 
with a dense silvery pubescence, the latter slightly carinated ; 
the mandibles black, their apex piceous. 
The thorax black, punctured ; the metathorax having the sub- 
cordiform space at its base longitudinally striated, the posterior 
portion has a deep fossulet in its centre, and is slightly punctate 
in front, and transversely striated behind; the tegule piceous ; 
the extreme base of the wings yellow, the nervures testaceo- 
piceous, and the wings themselves coloured about the centre and 
pale towards their apex ; the legs black, with the anterior tibiz 
in front and the base of the two posterior pairs yellow, all the 
tarsi piceous, the basal joint being the darkest ; the anterior pair 
ciliated in front, and the intermediate and posterior tibize spinose. 
The abdomen zeneous, pubescent, particularly conspicuous in 
angles on each side of the base of the segments, which thence have 
a silvery tinge; the apex of the posterior segment fuscous 2. 
The ¢ differs in having the apex of the scape, an inter- 
rupted transverse line on the collar, the tubercles, the exterior 
of all the tibize, and the basal joint of the tarsi, all yellow, the 
remainder of the latter graduating from testaceous to piceous; 
the exterior of the apex of the intermediate tibiz and the 
plantz densely fringed with long curled hair; the eneous tinge 
of the body is stronger in this sex than in the 9. 
é in the Rev. G. T. Rudd’s Collection ; 
? in my own and other Collections. 
++} The ¢ has been taken by the Rey. G. T. Rudd in 
