Biological Papers. 



139 



Family Megachilid^. 

 Megachile texana Cress. Oak creek, San Bernardino ranch, and Bill Will- 

 iams fork, several specimens, 

 vidua, race monaidum Ckll. One specimen. 

 Ceratina, undetermined species. Oak creek and Bill Williams fork, 1 speci- 

 men each, 

 undetermined species. Oak creek, 3 specimens. 



Family Xylocopid^. 

 Xylocopa californica Cress. Oak creek, San Bernardino ranch, Baboquivari, 

 and Tucson, many specimens in each locality, 

 micans. Oak creek, many specimens, 

 new species. Bill Williams fork, Tucson, and Baboquivari, several 



specimens each, 

 undetermined species. Oak creek, 4 specimens. 



Family Bombid^. 

 ProtoxaBa gloriosa Fox. San Bernardino ranch, 10 specimens. 

 OxEea tristis Gribodo. San Bernardino ranch, 8 specimens. 

 Psithurus insularis Sm. Oak creek, 1 specimen. 



Bombus bifarius Cress. Oak creek and Humphrey's Peak, at base, 1 speci- 

 men each, 

 dorsalis Cress. Oak creek, 5 specimens, 

 flavifrons Cress. Humphrey's Peak, several specimens, 

 howardi Cress. Oak creek and Humphrey's Peak, several speci- 

 mens, 

 morrisonii Cress. Oak creek, many specimens, 

 sonorus Say. San Bernardino ranch and Tucson, many specimens; 

 Baboquivari, 1 specimen. 



Apis mellifica Linn. 



Family Apid.e. 

 Abundant at all the camps. 



SUMMARY OF FAMILIES AND SPECIES OF HYMENOPTERA. 



Tenthredinidse 8 



Siricidae 2 



Evaniidae 1 



Ichneumonidee 29 



Braconida? 12 



Encyrtidae 1 



Perilampidfe 3 



Chalcididge 7 



Figitidae 2 



Scelionidae 1 



Diapriidse 1 



Formicidae 6 



Dorylidae 1 



Myrmicidse 4 



Mutillidae 15 



Tiphiidse 3 



Scoliidae 8 



Myzinidae 3 



Chrysididae 8 



Eumenidffi 19 



Vespidae 7 



Ceropalidae 34 



Totals : Families, 44 ; species, 435, 



Sphecidse 29 



Larridae 14 



Bembecidaj 13 



Nyssonidae 5 



Trypoxylonidae 2 



Philanthidce 21 



Mimesidse 2 



Pemphredonidae 2 



Crabronidse 10 



Oxybelidge 5 



Andrenidae 4 



Halictidae 8 



Prosopidge 12 



Nomiidae 1 



Panurgidae 16 



Anthophoridae 47 



Melectidae 16 



Stelidffi 12 



Megachilidfe 27 



Xylocopidse 4 



Bombidae 9 



Apidae 1 



