54 PROCEEDINGS OF THE ACADEMY OF [1896. 



Nothing is known of exact locality or habits. The following notes 

 were made from one of the types. 



Clypeus panama-hat-shaped, as in interrupta. Cheeks unarmed. 

 Dog-ear marks distinct, but supraclypeal mark wanting. Head 

 quite large. Mandibles simple. 



The lateral face-marks have their upper angle a right angle, and 

 are so placed as to be exactly level with top of clypeus, the dog-ear 

 marks projecting a little above the same level. 



The mesothorax is tolerably shiny, but quite closely and strongly 

 punctured. The stigma and veins are brown, not very dark ; mar- 

 ginal long, obliquely truncate, appendiculate, poststigmatal portion 

 considerably longer than substigmatal. Stigma small. 2d sub- 

 marginal large, narrowed fully one-half to marginal. 3d discoidal 

 distinct but rather weak. 



The following tables separate calijornica from two species present- 

 ing a certain superficial resemblance to it. 



A. (1). Upper margin of face-marks forming nearly a straight line. 



Head larger. Marginal cell appendiculate. Margins of 

 abdominal segments very distinctly reddish-testaceous, 



=californica $ . 



(2). Upper margin of face-marks forming a broad W. Head 

 smaller. Marginal cell not appendiculate. Margins of 

 abdominal segments not reddish-testaceous, =asteris 9 • 



B. (1). Larger. Supraclypeal mark absent. Lateral face-marks 



not reaching level of insertion of antennse. Clypeus shaped 

 like a panama hat, .... =californica $ . 



(2). Smaller. Supraclypeal mark present. Lateral face-marks 

 going above level of insertion of antennse. Clypeus shaped 

 like a rather low cork helmet, . . =tarda $ . 



4. Perdita arcuata Fox, Proo. Cala. Acad., 1893, p. 18. cf (Hab., Calmalli 

 Mines, L. Cala., in April). 



Two specimens known, found by Mr. Haines. From one of these I 

 noted as follows: Mandibles simple; cheeks unarmed. Diflfers 

 from semicoerulea, phymatce and latior in having margins of abdom- 

 inal segments broadly rufotestaceous, exactly as in californica. In 

 the shape of the head, and general structure, it precisely agrees with 

 californica ; but differs from that by its entirely dark face, the labrum 

 and the base of the mandibles only being yellowish. The vertex is 

 well punctate, and it and the mesthorax are quite dull. 



