SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. 85 



longer than second; second nearly square. Head very large, 

 face very broad; front with excessively close punctures; nieso- 

 thorax with close small but strong punctures ; base of meta- 

 thorax with a fine but dense radial sculpture ; first segment of 

 abdomen very closely but strongly punctured. Closely allied 

 to H. fasciatus, Nyl, and H. meliloti, Ckll., but easily known 

 by its very broad face and darkci- tegulae and wungs. It is true 

 that such differences in tbe breadth of the face occur elsewhere 

 in the restricted genus Halictus withm specii^c limits, so it may 

 be that catalinensis is only a subspecies of H. Meliloti; but as 

 the three specimens seen are similar, and I know of no inter- 

 mediates, I leave the Catalina insect as a species. 



Hab. — Avalon, Catalina Island, California. Aug.. 1901. 

 Collected by Miss Ada Springer. Three females. 



DIPTERA. 



The following have been kindly determined for me by 

 Mr. Coquillet : 



Paragus tibialis, Fallen; La -lolla. 



Eristaiis tenax, L., Zeuxia rufonotata. Bigot, Ophyra leuco- 

 stoma, AA^ied, and Lipochaeta slossonae, Coq., all from San 

 Pedro. 



HEMIPTERA. 



Narnia pallidicornis, Stal. Rasahus tlioracicus, Stal, and 

 Melanolestes abdominalis, H. S., all from San Pedro ; kindly 

 determined by Mr. Heidemann. 



On the cliffs at San Pedro. Isomeris arborea is abundantly 

 infested by a nearly blaclv variety of Murgantia histrionica, 

 which may be called var. nigricans. 



CRUSTACEA. 



The follownig. collected at San Pedro, have been kindly 

 identified by Dr. Benedict of the National JMuseum. 

 Lepidopa myops, Stimpson. 

 Blepharopoda occidentalis, Randall. 

 Pagurus confinis, Benedict. 

 Emerilia analoga. 



