AMERICAN COLEOPTERA, 43 



elightlv emarginate at middle and not concave, broadly margined with rufous. 



Female. — Auteniife similar in form to the male but less flattened, joints 

 longer than wide and more triangular. 



This species differs from the other Mycterua in our fauna by the 

 broader antennae of the male, the flat and emarginate last ventral seg- 

 ment, and the thorax not widest at base. 



Specimens were collected by Mr. Crotch, at Temescal, California, on 

 the flowers of Agave. 



The last ventral segment, in the two other species of which the 

 males are known, has the margin rather broadly reflexed so that there 

 is a moderately deep semilunar depression formed, the posterior mar- 

 gin is rounded in concolor and broadly truncate in scaler. The first 

 ventral segment at middle in the above two species is elevated in a 

 moderately convex umbone, which in scaber is densely pubescent, and 

 in concolor somewhat more convex, and in the only male before me 

 entirely nude. The species just described does not appear to have 

 this elevation of the first ventral segment. 



Descriptions of New COLEOPTERA chiefly from the 

 Pacific Klope of North America. 



BY J. L. LECONTE, M. D. 



The present paper is prompted by a desire to render the collections 

 of Mr. Gr. R. Crotch, on the Pacific Slope of North America, available 

 to the subscribers and purchasers of his collections with the least pos- 

 sible delay. Ou examining the large number of specimens brought 

 back by him, as was to have been expected, many new species were 

 found ; descriptions of the more interesting of these have been pre- 

 pared by Dr. Horn, Mr. Crotch and myself, according as our famili- 

 arity with the respective families represented by the new species has 

 enabled us to do this with precision. I have availed myself of the 

 present opportunity to add the characters of a few remarkable or im- 

 portant species, partly from the Pacific, partly from other regions of 

 the United States, which have been added to my collection, by the 

 kindness of various friends. 



