198 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



County, July 2 (same); Marin County, California, August (same); 

 Sauzalito,Marin County, California, Behrens; San Francisco, California, 

 September, October 15, November (U.S.N.M. Riley collection; S. H. 

 Scudder; Museum C6mparative Zoology); Alaineda, California, Decem- 

 ber 15 (IJ.S.K.M. Eiley collection) ; Merced County, California (same) ; 

 Atwater, Merced County, California, July 29, Coquillett (same); Los 

 Angeles, California, June, August, in coitu September 20, Coquillett, 

 October 24 (same; S. H. Scudder); Pasadena, Los Angeles County, 

 California, October 23; Tighes, San Diego County, California, Palmer; 

 Southern California, Coquillett (U.S.N.M. Kiley collection). 



The species has also been reported from various other counties in 

 California, mostly in the central portions of the State, such as Fresno, 

 Yuba, Napa (Riley), Sutter, San Joaquin (Coquillett), and Lake Tahoe, 

 Placer County (Scudder), as well as from districts immediately adjoin- 

 ing California, as the adjacent parts of Oregon (Bruner), Keno, Washoe 

 County, and Glen Brook, Douglas County, Nevada (Scudder), and Ari- 

 zona (Bruner). 



It has also been stated to occur in Colorado (Scudder), Kansas, North 

 Dakota, northwest Wyoming, and Montana (Bruner), Idaho (Bruuer, 

 Milliken), and in Utah in the Salt Lake Valley (Scudder) and Nephi, 

 Juab County (Eiley); but certainly in some, and probably in all these 

 cases, the insect reported was mistakenly supposed to be this species. 



Coquillett describes a dipterous parasite, Sarcophaga opifera, as found 

 in this species, and gives in the Twenty-seventh Bulletin of the Ento- 

 mological Bureau at Washington a full account of the ravages of this 

 locust in California, where they appear to do most damage to vineyards 

 and to deciduous fruit trees, the latter of which always suffer the most 

 in the vicinity of grain fields, upon which the migrating swarms appear 

 always to descend, attracted, perhaps, by their color. Grain, however, 

 appears to suffer relatively little at their hands, though alfalfa proves 

 attractive. 



A description of the colors of the living young, by Mr. Coquillett, 

 will be found in the report of the United States Entomologist for 1885, 

 page 293. 



The species is an exceedingly variable one, and with limited material 

 it would be difficult to believe that there was but a single species, so 

 widely different is the appearance of the extremes. This, I suspect, 

 will prove partly dependent upon station, though the different forms 

 into which I would provisionally separate the species appear to be 

 found indifferently in almost all parts of the State, though, as far as the 

 collections before me show, all appear to be more abundant in the cen- 

 tral and northern portions. 



There is first the dark and rather small form, which is prevalent 

 about San Francisco, and which may be called M. d. obscurus (Plate 

 XIII, figs. 3, 4). It is also found in Sierra, Placer, Mariu, Sacramento, 

 Eldorado, and Alameda counties, as well as in Siskiyou County, in the 



