416 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lie 



Types. — The type female, taken at Mokelumne Hill, Calaveras Co., 

 Calif., 1500 ft. elevation (F. E. Blaisdell), is at the U.S. National 

 Museum, no. 66162. Para types are as follows: 



California: ?, Werner's, San Diego Co., Aug. 1, 1921; ?, Los Angeles Co. 



Distribution. — Southern California. 

 Prey record. — None. 

 Plant record. — None. 



Group III 



This group is distinguished by the following characters: (1) A 

 distinct lamella (or lamellae) appears on the free margin of the medial 

 clypeal process. (2) The extension of the medial clypeal lobe on the 

 male is noticeably narrow, with three more or less distinct denticles 

 on its margin. (3) Mesostemal tubercles are absent from both sexes 

 or are very small. (4) The terminal segment of the male antenna is 

 distorted slightly. (5) Chrysomelidae are used as prey to feed the 

 young, as recorded for three species {compacta Cresson, flavofasciata 

 H. S. Smith, and robertsonii Fox). 



30. Cerceris cochisi, new species 

 Figure 39 



Female. — Length 14 mm. Amber and yellow with little or no 

 black or dark amber, punctation and pubescence normal. Structurally 

 near the female or O. compacta compacta Cresson except that specimens 

 of the former are slightly larger. Enclosure somewhat smoother. 



Head yellow below the antennal scrobies, two yellow spots on the 

 vertex, and yellow patches back of the compound eyes; small dark 

 areas between the ocelli; basal two-thirds of mandibles yellow, apical 

 third and denticles dark amber; scape yellow and amber, remaining 

 segments of antennae amber becoming darker apically. 



Thorax amber except pronotum, scutellum, metanotum, and tegulae, 

 which are yellow; legs light amber; wings shaded with amber. 



Abdomen yellow except for tergum 1, anterior half of tergum 2, 

 most of first 2 stemites, and the sixth segment, all of which are light 

 amber. 



Male. — Length 12 mm. Amber and yellow with little or no black 

 or dark amber, punctation and pubescence normal. Structurally near 

 the male of C. compacta Cresson, except that specimens average slightly 

 larger. Enclosure somewhat smoother. 



Head yellow below the antennal scrobies and patches back of the 

 compound eyes; small black ocellar area; basal half of mandibles 

 yellow, apical half dark ; scape yellowish amber, basal half of antennae 

 amber, apical half very dark. 



