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— The aquatic and seniiaquatic Hemiptfia from 12 localities in Marble Canyon and Grand Canyon are reported, along with those from I locality in the Escalante Canyon. Fourteen species are recorded and compared to the water-bug fauna of the southwestern Ignited States and western Mexico. Ochterus rotundas n. sp. is described from the Grand Canyon and the mountains of western Mexico. The aquatic and seniiaquatic Heteroptera of the Grand Canyon are not well known. This fact, coupled with the discovery that an undescribed ochterid inhabited both the Grand Canyon and the mountainous regions of western Mexico prompted an expedition to sample this fauna in late May and June 1972. Collecting permits were granted by the U.S. Park Service, and we obtained the splendid cooperation of the late Dr. Aaron Ross of Ogden, Utah, who provided raft transportation, advice on a variety of different ecological situations that could be sampled, and logistic support to help reach collecting locations. In this paper, we treat Marble Canyon and the Grand Canyon as one. The starting point was Lee's Ferry and the stopping point was the pull-out north of Peach Springs, Arizona. Later in 1972 the first author sampled a spring location in Davis Gulch on the Escalante and the data is included for comparison. The 13 collection locations are described so that ecologists can make use of the data presented here. Following the species tabulations, a discussion of the affinities of the fauna is given. All material is held in the collections of the University of Colorado Museum (CU) and the United States Museum of National History (USNM). In addition to those mentioned previously, we are indebted to Dr. Peter Robinson (CU) and Dr. Jon Herring (USNM) for making available material for study. Description of Collection Locations CL557. Lake Powell. Davis Gulch on the Escalante River. This gulch has intermittent water in the sandy stream bed, with some permanent seep springs. The collection was made at the side of a small waterfall. The damp soil was overgrown with Aegetation which had to be pulled away to disturb the soil clinging to cracks in the rock before the bugs could be seen. There were many trees, grasses, and other plants in this canyon. October 2, 1972. CL545. Vasey's Paradise. Marble Canyon. This is a well-known spring leaping from a sheer wall. Adjacent to the spring are many seeps with abundant vegetation, and wet rock faces with and without vegetation; the collections were taken from these seep areas. May 28, 1972. CL546. Buckfarm Canyon. Mile 41, Marble Canyon. Buckfarm is dry at the Colorado River confluence, but abundant seeps occur on a low wall about i^ mile upstream. A great deal of vegetation grows on this wall, preventing the moist earth from eroding. May 28, 1972. CL547. Clear Creek. Mile 84. The permanent stream has swift, clear water and a pebbly bottom without large boulders. Collections were made along the stream and at pools near a waterfall about a mile from the mouth. May 30, 1972. CL548. Confluence of Colorado and Little Colorado. The latter river is milky blue since most of the flow originates in large springs some distance upstream. The pebbles and rocks in the riffles are covered and stuck together ^vith travertine; the fauna is depauperate. May 29, 1972. CL549. Shinomu Creek. Mile 109. This is a good-sized stream with a stony and gravel bottom. The water is 'Department of Environmental, Population and Organismic Biology. University of Colorado, Boulder 80302 and Martin Marietta Corp.. Denver 80201. =E 1102 Plateau, Spokane, Washington 99203.

Aquatic and semiaquatic Heteroptera of the Grand Canyon (Insecta: Hemiptera)