HYMENOPTERA FROM LOWER CALIFORNIA. 267 



Bembex monodonta Say. Four males. San Jose 

 del Cabo. 



Trypoxylon albitarse Fabr. Tepic. One female. 



Trypxoylon aztecum Sauss. San Jose del Cabo. 

 Five ? and thirteen S specimens. In the S the color of the 

 first tarsal joint varies from white to black. The reddish 

 color existing on the basal joints of flagellum beneath in 

 the S does not occur in the female. 



Trypoxylon spinosum Cam. Two specimens. Tepic 

 and San Jose del Cabo. 



Trypoxylon centrale n. sp. 



? . — Head higher than broad, finely and closely punc- 

 tured; fore ocellus separated from the posteriors by a 

 slightly greater distance than the latter are from each 

 other, a distinct space between the posteriors and each 

 eye ; front just above the antennse with a prominent, 

 longitudinal ridge or carina, which extends less than half 

 way to the fore ocellus; face depressed on each side of 

 this ridge, above it the front convex, parted by a not 

 strong impressed line running from the ridge to fore 

 ocellus; occipital notch indistinct; clypeus flat, not car- 

 inated, its anterior margin rounded out, subangular in the 

 middle; space between eyes at the vertex greater than 

 the combined length of antennal joints 2 and 3, at the 

 base of clypeus this space is about one -third less than at 

 the vertex; first joint of flagellum about one-third longer 

 than the second; pronotum strongly and bluntly shoul- 

 dered at each side; dorsulum finely and very closely 

 punctured, the scutellum less so and not impressed; me- 

 sopleur^ less closely punctured than the dorsulum; mid- 

 dle segment above distinctly striated, obliquely and trans- 

 versely, with a slight, rather indistinct medial impression, 

 posterior face with the sculpture hidden by dense, pale 



