Art. XIX. — The Aiaaerican Beiubeciclse : Tribe ^tizini. 



By ^V, M. Patton. 



STIZINI. 



Labrum exserted , entire. Sulbuiedial cell of the posterior wings extend- 

 ing far beyond the medial cell on the externo-medial nervure. Inter- 

 mediate tibice armed with two spines at the aijex. Ocelli perfect j the 

 posterior ocelli smaller than the anterior one. 



Group. SPHECII. 



Marginal cell lanceolate, extending beyond the tip of the third sub- 

 marginal. Submarginal vein beneath the second submargiual cell flexed 

 to meet the first recurrent nervure, the latter inserted nearly in a line 

 with the portion of the submarginal vein beyond. Submedial cell of the 

 posterior wings broad and terminated by a sinuous transverse nervure. 

 9, Spurs of the posterior tibice greatly enlarged; a subtriangular en- 

 closure on the dorsal valve of the abdomen. ^, A single spine at the 

 apex of the abdomen; sixth ventral segment elongate and acute, hiding 

 the seventh ventral; pleural lobes of the seventh segment not distinct. 



Sphecius Dahlb. (1843). 



Syn. EogarcUa Lepel. (1845). 



Stizus Smith (nee Latr.). 

 Type : Sphecius speciosm (Drury) Dalilb. 



Head well rounded out behind the eyes ; tne axes of the eyes parallel, 

 the inner margin slightly excavated above. Clypeus subtriangular, the 

 upper corner squarely cut off, the lower edge slightly rounded out on 

 each side and sinuated in the middle. Labrum with its length not half 

 as great as its breadth. Mandibles stout, very unequally bidentate. 

 Antennae of similar form in the two sexes, thickened towards the tip, 

 the third joint equallin*' in length the two following taken together, the 

 antennae of the male not armed with spines, and the apical joint neither 

 lengthened nor excavated. The 4th to the 13th joints of the male 

 antennae with a narrow groove beneath. Legs stout, the pul villus large. 

 Legs of the female very strongly spinose; joints of the anterior tarsi not 

 produced at the tip, fringed externally with spines which are not half 

 as long as the apical joint of the tarsus; the two basal joints of the 

 intermediate tarsi produced at the tip externally, the process terminating 

 in a stout spine; basal joint of the posterior tarsi long; the spurs of the 



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