24 CALIFORNIA ACADEMY OF SCIENCES. 



distinct radial or marginal side, and receives the second 

 recurrent nervure at about the middle ; flagellum of an- 

 tenna? not pilose, its first joint about as long as the sec- 

 ond and two-thirds of the third; clypeus slighth^ in- 

 curved medially; posterior margin of pronotum bowed 

 (in one specimen slightly sub-angular) ; metathorax with 

 a slightly impressed line ; tibia? and tarsi armed with stout 

 spines; claws armed with an acute tooth near the base; 

 comb on fore tarsi composed of long and stout spines, 

 which are nearly as long as the first joint; longer spur 

 of hind tibice equal to about half the length of the first 

 hind tarsal joint; abdomen much longer than head and 

 thorax united, apicall}^ with a few black hairs. Length, 

 14-16 mm. 



San Jose del Cabo, L. Cal. [Eisoi). Two specimens. 

 Evidently related to P. apiciilatits Smith, from Vera 

 Cruz. 



Agapostemon nasutus Sm. Three specimens. 



Centris mustelina n, sp. 



$ . — Head and thorax black, the abdomen and legs 

 tawny, mandibles at base and apex yellow; clypeus, la- 

 brum and first three or four joints of antenna? also 

 tawny; flagellum beneath, particularly towards apex, tes- 

 taceous; head, thorax, first abdominal segment entirely, 

 a fringe at apex of fifth segment, and likewise at apex of 

 ventral segments, with pale ochraceous pubescence, that 

 on the clypeus very short and appressed; mandibles 

 fringed with long pubescence ; hind tibicE and tarsi dark 

 brownish, their pubescence tawny; wings sub-hyaline, 

 not iridescent; excludino- the long hairs, the abdomen is 

 more or less covered with a short appressed pubescence ; 

 apical ventral segment emarginate; tegukt testaceous. 

 Length, 18 mm. 



3 . — Colored like the female, except that the most of 



