J.D. Anderson 1957 Journal May 11 Valencia Jaguar Rio del Mar Santa Cruz, Calif. never had. Possible factors (1) more extensive Elodea, providing cover impeding dip net; (2) feeding water - makes more shallow areas available, thus spreading larvae; (3) Overcast day. I think 1 + 2 are responsible - see D. Conchostraca still may abound. Ate lunch 12:30-1:30. Drove to Elliott pond. Worked NW corner pond & got 5 tigrinum + 2 croceum larvae in 18-24" water. There in extensive stand of Elodea - not thick clumps but where it cover wide area with swimmer's space. Got there in 1 hour. Took food samples also. Then worked SW corner near wood willow stand. Got 3 croceum + 4 tigrinum larvae in shallow water here (depths 4-7"). Far more abundant than anywhere else. Took those 7 in 20 minutes of dip netting. Tadpoles very abundant. / Large Belostoma, a possible predator taken here also. Both medium + large tigrinum taken. Collected water sample for pH determination, also took tadpoles & other animals for feeding cortine larvae. Drove back to Valencia & got water sample there. Left for home at 6 pm. Ran into heavy Sunday traffic in Santa Cruz Mtns. Took 2 3/4 hrs. Note - Bourpate shells feeding on tadpoles in Elliott pond.