HYMENOPTERA FROM LOWER CALIFORNIA. 1 3, 



a short, erect pale-fuscous pubescence, wings subhyaline, 

 fuscous in places, iridescent, stigma ferruginous, nervures 

 black; tibise and tarsi more or less ferruginous. Length, 

 II mm. 



El Paraiso, L. Cal. {Haines). May. Related to M. 

 marginalis Cresson, from which it may be distinguished 

 by the spots on clypeus and scutellum, and by the coarse 

 sculpture of head and thorax. From the other North 

 American species, the white ornamentation will distin- 

 guish it. 



EUMENID^. 



Odynerus toltecus Sauss. Hermosillo, Sonora. 

 April. {Eiscii). One 5 specmien. 



Odynerus mystecus Sauss. San Jose de Gracias, L. 

 Cal. {Haines). April. Two specimens ? 6 . The ? 

 differs from Saussure's description in having two "free 

 spots " on second abdominal segment. 



Odynerus sp. Two specimens of a species related to 

 mystecus. Hermosillo, Sonora {Eiscn). April. 



Odynerus Saussurei n. sp. 



? • — Clypeus pyriform, with a few coarse punctures, 

 strongest towards middle; the clypeus has also some 

 coarse, longitudinal folds or stride, its anterior margin 

 with two rather widely separated teeth; front with dense, 

 coarse punctures, which gradually become weaker and 

 sparser towards the vertex until they disappear entirely on 

 the occiput, the latter with a slight depression in the 

 middle ; thorax as coarsely punctured as the front, but 

 not so closely; lateral angles of pronotum not dentate; 

 metathorax with its concave face, with a few irregular 

 striations, which are most distinct on apical portion, the 

 lateral angles rather sharp ; first and second dorsal ab- 

 dominal segments, with exception of the apical border of 



