NO. 1866. NEW 8AWFLIES IN U. 8. NATIONAL MUSEUM— ROHWER. 403 



Genus PSEUDOSIOBLA Ashmead. 



Pseudosiohia Ashmead will probably be classed as subgenus of 

 Siohla Cameron, separated from it by the shorter pedicelliim and only 

 one (in some cases none) discal cell in the hind wings — in Sioble there 

 are tw^o. Siohla Kirby ^ is a composite group. 



Key to North American species. 



Females 1 



Males 3 



1. Sheath sharply truncate, subparallel-sided; second cubital cell not much shorter 



than the second ; cljqjeus white cephalantki Rohwer . 



Sheath rounded below, not subparallel-sided; second cubital cell distinctly shorter 

 than the second; clyi^eus mostly black 2 



2. Stigma tapering, not truncate apically; posterior orbits closely pimc- 



tured excavata (Norton). 



Stigma rounded below, truncate apically; posterior orbits and occiput sparsely 

 punctured robusta (Kirby). 



3. Stigma tapering, not truncate apically (clypeus mostly black; posterior orbits 



closely punctured) excavata (Norton). 



Stigma rounded below, truncate apically 4 



4. Clypeus black; third antennal joint subequal with the fourth and fifth. 



floridana (Provancher). 



Clypeus yellow; third antemial joint distinctly shorter than the fourth and 



fifth cephalantki Rohwer. 



PSEUDOSIOBLA ROBUSTA (Kirby). 



This species w^as originally described from Georgia. In the 

 National Museum collection is a female 

 from Texas (Belfrage collection), which 

 agrees exactly with Kirby's description and 

 manuscript notes from the type. 



PSEUDOSIOBLA FLORIDANA (Provancher). 



Type.—Csit. No. 13965, U.S.N.M. 



Dr. A. D. Mac Gillavray ^ gives this as 

 a synonym of robusta (Kirby) . It is perhaps 

 better to keep them separate for the present, 

 as floridana has the posterior orbijis closely 

 punctured ; the basal dorsal segments finely ^'tl'Z^T^T^^l ''^r"" 



" . ' ^ "^ AND SHEATH OF PSEUDOSIOBLA 



aciculate (in robusta only the base of the sec- robusta (Kirbv). 



ond is aciculate) ; and the wings are darker. 



In the associated males and females this antigeny does not occur. 



The stigmal and cubital venation is as in robusta. 



1 List Hym. Brit. Mus., vol. 1, p. 250, etc. " Can. Ent., vol. 40, 190S, p. 366. 



