240 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 49. 



stronger in male; anterior margin of pronotum with a fine carina, 

 angles subdentate; thorax with separate punctures; meso-scuto- 

 scutellar sutures foveolate; scutellum with a median longitudinal 

 furrow; metanotum narrow, raised, emarginate in middle; apical mar- 

 gin of the second dorsal strongly refiexed; suture of second ventral 

 strongly foveolate; base of second ventral with a median sulcus; pos- 

 terior coxae with a spine. Mostly ruf o-f erruginous ; wings strongly 

 dusky. 



Odynerus sulciventris Cameron and 0. congressensis Cameron, judg- 

 ing from the descriptions are similar in color, but the metanotum is 

 quite different. The species of this group may be separated by the 

 following table: 



Head black and yellow; mesoscutum black; anterior ocellus hooded; third dorsal 

 slightly refiexed, male precampanulatus Viereck. 



Head rufo-ferruginous or with some black; mesoscutum mostly ferruginous; anterior 

 ocellus not hooded; third dorsal segment not refiexed, female 1. 



1. No depression behind ocelli; front and posterior orbits with rather close distinct 

 I punctures (second dorsal with free yellow spot) blawus Rohwer. 



A shallow depression behind ocelli; head with poorly defined widely separated punc- 

 tures odontoscMus Rohwer. 



ODYNERUS (STENODYNERUS) PRECAMPANULATUS Viereck. 



One male which agrees very well with the original description of 

 this species was collected May 5, 1910, at Albuquerque, New Mexico, 

 by J. R. Watson. 



ODYNERUS (STENODYNERUS) BLAWUS, new species. 



This may be the female of precampanulatus, but the head is more 

 strongly punctured, and there is a free yellow spot on the second 

 dorsal segment, as well as some other characters. 



Female. — Length to apex of second dorsal 7.5 mm. Clypeus 

 striatopunctate; punctures of the head rather large and not separated 

 from each other by more than twice the width of a puncture; first 

 joint of the flagellum slightly longer than the second; mesothorax 

 punctured like the head; lateral aspect of propodeum finely striato- 

 punctate; metanotum not serrate; abdomen punctured similar to 

 head. Rufo-ferruginous; flagellum above, antennal foveae, rectangu- 

 lar spot inclosing ocelli, spot on anterior mesoscutum, sutures of 

 mesothorax and prepectus black; small spot at eye emargination, 

 two small spots on middle of pronotum, band on first, second, and 

 third dorsal segments and a small spot on second dorsal yellow. 

 Wings irridescent, venation black. 



Albuquerque, New Mexico. One female collected May 5, 1910, 

 by J. R. Watson. 



Type.— Cat. No. 14306 U.S.N.M. 



