SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. 23 



The Bees of Southern California. II. 



BY T. D. A. OOCKEREI<L. 



When writing on Dianthidium, I failed to notice that Anthi- 

 dium singulare, Cresson, and A. larreae, CklL, hoth belong to 

 this genus. The following table separates those species of 

 Anthidium and Dianthidium in which the cheeks are partly or 

 wholly yellow, and the yellow of the cheeks is connected by a 

 line (sometimes slightly interrupted in the middle) across the 

 top of the head. 



Lateral margins of abdominal segments 2 to 4 produced into 

 hollow, processes, which look like spines directed back- 

 wards, when seen from above 1 



Lateral margins of abdominal segments 2 to 4 normal 2 



1. First two abdominal segments with the yellow bands di- 

 vided into spots (Nevada) . .Dianthidium singulars (Cresson) 



First two abdominal segments with the yellow bands deeply 



notched, but not divided (South-ern California) 



D, singulare var. perluteum, v. nov. 



2. Pulvillus present; legs red (New jNIexico) 



Dianthidium larreae (Ckll.) 

 Pulvillus al)sent ; legs yellow and black 3 



3. Dorsal pubescence of thorax white (Southern California) 



Anthidium serranum, n. sp. 

 Dorsal pubescence of head and thorax pale fuscous. 4 



4. Femora with nmch yellow (Nevada, California) 



A. illustre, Cresson 

 Femora black (Nevada) A. conspicuum, Cresson 



Dianthidium singulare var. perluteum, T. & W. Ckll, n. var. 



Female, length 12i/^ mm., expanse of wings about 24 mm. ; 

 clypeus yellow without anj^ central black dot; supraclypeal 

 mark triangular ; yellow bands on first two abdominal segments 

 entire (i. e. not interrupted), with large, rounded, sublateral 

 posterior notches; abdomen strongly punctured. 



Two collected by Dr. Davidson; Wilson's Peak and Straw- 

 berry Valley, California. It is much to be desired that the 

 habits of this remarkable insect should be made known. 



Anthidium illustre, Cresson. 



Nevada is the type locality. Fowler has described the male 

 from Redlands, California. Dr. Davidson has collected two fe- 

 males and a male at Los Angeles. 



