ENTOMOLOGY OF COLORADO. 



309 



contribution, I want rather to so present the facts that the reader 

 may compare them and judge for himself, correcting the details or 

 adding to them when necessary. 



Among the Coleoptera it will be noticed at once how many of the 

 species are boreal, extending to Canada (sens, lal) and often to the 

 New England States. The Southern element is but slight, although 

 distinct if looked for ; and there is also a fair number of species 

 endemic in the Rocky Mountains. The Tenebrionidre, characteristic 

 of the Western prairies, are fairly numerous. The Coleopterous 

 fauna, as a whole, is strikingly distinct from that of the Mississippi 

 region and the Eastern States generally, except as regards the boreal 

 element. Mr. Wickhara has published a list of the beetles found in 

 the vicinity of Iowa City, and on comparing it with the present list, 

 I was astonished to find how few were the species common to both. 

 This result is brought about in large measure, no doubt, by the dif- 

 ferent character of the forests— those of Iowa containing a great 

 variety of deciduous trees, those of Colorado mainly conifers, with 

 very few deciduous species. Thus, it happens that not one species 

 of Cerambycidte is common to the Custer County and Iowa City 

 lists, although six species are common to our district and the much 

 more distant State of New Jersey. 



The Rhopalocera are boreal wdth a strong Western element, and 

 a rather surprising number of Southern forms— some of which, 

 however, are evidently represented only by stragglers. Thus, Cal- 

 lidryas eahide at Rosita seems quite out of place, but the occurrence 

 is less remarkable when we remember the strong migratory tenden- 

 cies of the genus. C philea has been taken in Arapahoe County, 

 Colorado, by Mr. H. G. Smith, Jr., as I learned from Mr. Nash. 

 Terias nicippe, however, is not accidental, and NathaUs iole is very 

 well established and common. The Heterocera show similar tenden- 

 cies. The really neotropical Erebus odora is an occasional visitor. 



The Hvmenoptera, especially among the parasitic groups, show 

 many apparentlv endemic forms— but it is probable that further 

 knowledge will prove that most of them are more widely distributed. 

 Thus, 3Ionodo)ttomeriis montivagns, known only hitherto from Wet 

 Mountain Valley, has recently "turned up in California. _ With the 

 aid of Mr. Cresson's invaluable list, I made out the affinities of the 

 88 aciUeata of Wet Mountain Valley to be as follows : 



Boreal *^1 



Noitli America generally 4 



Eocky Mountains only 39 



Texas region and South 11 



Eastern States 2 



California 1 



88 



TEANS. AM. ENT. SOC. XX. NOVEMBER, 1893. 



