NO. 2192. DRAOONFLIES, CALIFORNIA AND NEVADA— KENNEDY. 541 



The thorax in this species is covered with pile which softens the 

 intense colors. 



Abdomen, male, 36-37 mm.; female, 35-38; hind wing, male, 

 29-30 mm.; female, 31-31.5. 



This species occurs on the smaller perennial streams emptying into 

 San Francisco Bay and Monterey Bay, also on the smaller tributaries 



"/l\#^ 



218^ 



FlG3. 204-211.— OpmOGOMPHUS OCaDENTIS. 204. COLOE PATTERN. 205. HAMULES. 206-208. MALE, 

 APPENDAGES. 209. VULVA. 210. FEMALE, OCCIPUT. 211. APPENDAGES OF A MALE FROM CORVAXLLS, 



Oregon. 

 Figs. 212-218.- 



-Ophiogomphus occidentis californicus. 



of the Sacramento River. On the Sacramento itself and its larger 

 tributaries it appears to be displaced by Ophiogomplms occidentis. I 

 have not found it on streams which carry much snow water. It is 

 found on the same streams that are occupied by OctogompJius, but the 

 latter stays on the torrential headwaters while hison occupies the low- 

 land sluggish portion of the stream, where it is associated with Gom])hus 

 sobrinus and Progomi^lius lorealis. 



Its habits are very similar to those of severus and nevadensis. It 

 is usually found on gi'avel bars bordering a riffle and seldom more 

 than five or six are found at one place. The females oviposit where 

 the water is the swiftest. 



