302 NATURAL HISTORY BULLETIN. 



STAPHYLINID.-E. 



Tachyusa sp. Yuma. 

 Polyodontes sp. Riverside. 

 Heterothops fumigatus Lee. Riverside. 

 H. pusio Lee. Pinal Mts. 



Quedius desertus Horn. Pinal Mts. Under leaves in damp spots or be- 

 neath logs. 

 Belonuchus ephippiatus Say. Santa Rita Mts., in decaying yuccas. 



Tucson. 

 Philonthus hepaticus Er. Riverside. 

 P. puberulus Horn. Riverside. 

 P. varians Payk. Riverside. 

 P. alumnus Er. Riverside. 

 P. innocuus Horn. Pinal Mts., Tucson. 

 Actobius gratus Lee. Yuma. On wet banks. 

 A. p.ederoiues Lee. Tucson. Common on banks of pools. 

 Xantholinus pusillus Saehse. Riverside. 

 Stenus incultus Casey. Yuma. 

 S. arizon.e Casey. Riverside. 



Cryptobium arizonense Horn. Pinal Mts., Tucson. 

 Lathrobium lituarium Lee. Tucson. 

 L. dimidiatum Lee. Tucson. 

 Medon sp. Pinal Mts. 

 P.ederus ustus Lee. Yuma. 

 Sunius similis Aust. Yuma. 

 Pinophilus densus Lee. Yuma, Tucson. 

 Troglophlceus dentiger Casey. Yuma. 

 T. gil.-e Casey. Yuma. 

 T. tantillus Casey. Yuma. All the above species of Trogophlczuswere 



taken on the margins of pools among the willow thickets near the river. 

 Thinobius hesperius Casey. Yuma. 

 T. sp., probably new. Riverside. 

 Apocellus gracilicornis Casey. Riverside and Tucson, very abundant 



in wet places. 



TRICHOPTERYGID^E. 



Trichopteryx hornii Matth. Pinal Mts. Abundant under dead leaves 

 near a spring. 



SCAPHIDIIDyE. 



Scaphisoma rufulum Lee. Yuma. 



COCCINELLID^E. 



Megilla maculata De G. Yuma. 



Hippodamia convergens Guer. Santa Rita Mts., Pinal Mts. 



Chilocorus cacti Linn. Tucson. 



Exochomus marginipennis Lee. Yuma. 



Scymnus pallens Lee. Pinal Mts. In oak scrub. 



