AMERICAN COLEOPTERA. 277 



NOTKS O^ DICHELiOKYCHA AND CANTHAKIS, WITH 



DESCRIPTIONS OF NEW SPECIES IN 



OTHERA GENERA. 



BY H. C. FALL. 



The observations on the two genera above named are, as is often 

 the case, the outgrowth of an effort toward a satisfactory arrange- 

 ment of my own cabinet. The loan of material from other sources 

 has, however, permitted a much more comprehensive view than 

 would otherwise have been possible, and I desire therefore to ex- 

 press ray hearty thanks to all who have thus given assistance, par- 

 ticularly to my friends Mr. Chas. Fuchs, Dr. E. C. Van Dyke and 

 Dr. F. E. Blaisdell, of San Francisco, and to Dr. L. O. Howard 

 and Mr. E. A. Schwarz of the National Museum, from whose col- 

 lections I received the entire material in these genera. To Mr. 

 Frederick Blanchard and Mr. Chas. Liebeck I am indebted for 

 notes on the LeConte and Horn collections, further reference to 

 which will be made in the proper place. 



DICHEEONYC HA. 



Since the Synopsis of this genus given by Dr. Horn in 1876,* it 

 has almost entirely escaped the attention of systematists ; one spe- 

 cies only — picea Horn f — having been subsequently made known. 

 New forms have, however, come to light, until the number awaiting 

 description has become, I think, greater than in any other genus 

 of the Scarabseidse, with the probable exception of Diplotaxis. 

 Nearly all of these new forms belong to the Pacific Coast fauna 

 and are either quite unknown to eastern collectors, or are mixed 

 there with older species — usually backii or valida — so that the de 

 scription in the following pages of nine species will perhaps excite 

 some surprise. 



Taken as a whole, the genus is very homogeneous in its makeup, 

 and in the survey of our species, which has of necessity accom- 

 panied the definition of the new forms, I have found little to add in 

 the way of characters serviceable for classification, to those set forth 

 by Dr. Horn in his Synopsis. 



* Trans. Am. Ent. Soc, vol. v, p. 185. 

 t Proc. Cal. Acad. Sci., 1894, p. 396. 



TEANS. AM. ENT. SOC, XXVII. AUG., 1901. 



