F0880RE8 — BEMBECID-E. llo 



Family BEMBECIDiE. 



This family is characterized chiefly by the distinctly exserted lab- 

 rum, which in some genera is long and rostrif'orm, and contains s' le 

 of the largest and finest s})ecies of the Order. The genera belonging 

 to the Stizini have been admirably treated in a paper by Mr. Patton 

 (Bull. V. U. S. Geo. Surv. 1879), in which the characters are given 

 in detail. 



The following table will assist in separating the genera : 



Table of Genera. 



Intermediate tibise armed with two spurs at ayex ; submedian cell of {wsterior 

 wings extending far beyond the median cell on the externo-niedial 

 nervure; labrum exserted, shorter than the elypeus; ocelli perfect. 



-Stizini 2. 



Intermediate tibife armed with but one spur at apex ; submedian cell of j>o.sterior 

 wings not extending beyond the median cell on the externo-medial 

 nervure ; labrum exserted, longer than the clypeus ; ocelli more or 



less imperfect.— Bembeoini ;}. 



2.— Marginal cell lanceolate, extending beyond the tip of the third submarginal 

 cell ; the submarginal nervure beneath the second submarginal cell 

 flexed to meet the first recurrent nervure, the latter inserted nearly 

 in a line with a portion of the submarginal nervure beyond ; spui*s 



of hind tibiie ? much enlarged.— Sphecii Sphecius Dahlb. 



Marginal cell ovate-lanceolate, not extending as far as the third submarginal 

 cell; submarginal nervure not flexed to meet the first recurrent 

 nervure, the latter convex at apex and inserted at an angle. — Stizi. 

 Large; legs robust, intermediate tarsi not longer than their tibiie. joints 

 2-4 short, not longer than broad, spurs of their tibia> short, pul villus 

 large; submedian cell of posterior wings extending no more than 

 its own breadth beyond the median cell on the externo-medial 



nervure Megastizns Patton. 



Medium ; legs more slender, intermediate tarsi much longer than their 

 tibisB. 

 Submedian cell of posterior wings extending no more than its breadth 

 bej-ond the median cell on the externo-medial nervure; i>ulvil!us 

 large ; joints 2-4 of intermediate tarsi short, not longer than broad ; 

 two apical joints of 'J, antennie armed with a spine beneath. 



Beinbecinns Costa. 

 Submedian cell of posterior wings extending much more than its own 

 breadth beyond the median cell on the externo-medial nervure ; 

 pulvillus small; joints 2-4 of intermediate tarsi elongate; % an- 

 tennae unarmed Stizus Latr. 



3. — Maxillary palpi short, generally concealed. 



Anterior wings without a sinus between the marginal and third submar- 

 ginal cells, the latter rounded at tip and scarcely narrowed towards 

 the marginal, which is obtusely truncate at tip; inner side of second 

 submarginal cell bent inwardly beneath. Bembex Fabr. 



