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specimen in his collection which I believed to be a new species 

 of Omus. He soon afterward forwarded it to Mr. H. Ulke of 

 Philadelphia, for identification, and it was shortly described by 

 Dr. Horn under the above name, as from Mr. Ulke's cabinet. 1 

 The specimen was taken in El Dorado Co., California, in June, 

 18G5, by Mr. Elliot Crane, a relative of Mr. Behrens, and is 

 the only one, I believe, at present known to entomologists. 

 Dr. Horn speaks of it as "a very singular species, differing 

 from all our others by its more elongate and cylindrical form 

 as well as by its color. " 



0. Lecontei. This very distinct species, easily known by its 

 more slender form and very long antenna?, appears to have its 

 locality in the more southern" portions of California, the speci- 

 mens from which Dr. Horn's description was made, having been 

 taken by Mr. W. M. Gabb, near Monterey, and a pair in my 

 own collection, a little farther south, viz., at Gaviota, by Mr. 

 W. S. Edwards, of the U. S. Coast Survey. 



0. scquoiarum. The first specimen of this species which I 

 ever saw was in the collection of Mr. J. Behrens, by whom it 

 was taken at the only locality at present known for it, the Mam- 

 moth Tree Grove, Calaveras Co. During the visit of the late 

 Mr. Crotch to this State, I called his attention to this insect, 

 and he at once recognized it as a new species and visited the 

 " Big Trees " almost for the purpose of finding so rare a treas- 

 ure. He was rewarded by the capture of seventeen specimens, 

 all remarkably constant in their characters. Last year (1874) 

 I also took three specimens, two males, one female, in the same 

 locality, two of which were running about a pathway in the 

 dusk of the evening. The species is remarkable for its dull 

 opaque black color and for the shorter, broader thorax, with its 

 hind margins most distinctly rounded. 



0. Edwardsii. This species was first taken by myself at 

 Lake Tahoe, California, beneath a pine log, the male and female 

 being found in coitu. Mr. Crotch visited the locality and cap- 

 tured five specimens, all agreeing exactly with the original. It 



1 Mr. Ulke informs us that, owing to the number of his California!) correspondents 

 and the quantity of specimens which he received from them, he was unable to recol- 

 lect the particular source from which this specimen came. Ed. 



