BEETLES OF THE GENUS MYOCHROUS — BLAKE 3 



America, I find that, as in other genera such as Disonycha^ the species 

 in many cases fall into fairly definite groups. As we come to know 

 more about them, I am certain that this grouping will become even 

 more evident. Because of the fragmentary knowledge of the genus 

 in Central and South America the keys that I have drawn up for 

 the species here described from those regions are bound to be inade- 

 quate. In the treatment of the Central and South American members, 

 the species have been grouped according to apparent morphological 

 characters rather than according to geographic distribution, insofar 

 as it is possible. 



In the United States, where I have recognized 13 species, the genus 

 appears to be best represented in the Central and Southern States. 

 There are two species occurring on the Pacific coast from the middle 

 of California southward, and on the Atlantic seaboard there are three 

 species that occur from Maryland southward. The rest are all from 

 the central part of the country. One species, squamosus^ ranges from 

 the Great Plains of Canada, in Alberta and Saskatchewan, through 

 Montana and the Dakotas south to Texas. The rest are found farther 

 south, movallus and a new species in the Dakotas, denticollis from 

 Iowa southward, and in Texas, the meeting point of Mexican and 

 northern species, there are seven species. 



In the Central American species the localities are too poorly indi- 

 cated on most of the specimens to permit many deductions. A great 

 many are labeled simply as found in shipments of fruit or vegetables 

 from Mexico, Guatemala, or Honduras. In all, 11 species are rec- 

 ognized as occurring in Mexico and Central America. Of these, three 

 are known to extend their range into the United States; 8 are re- 

 corded from Mexico. In the Canal Zone, where most intensive col- 

 lecting has been done, 5 are known. 



Two of the species found in the Canal Zone are represented in mu- 

 seum material from northern South America. Besides these two, 

 there are 26 others recognized in this paper from South Ajnerica. 

 They occur from Colombia on the Pacific side down through Ecuador, 

 Peru, and Bolivia to Chile, and on the Atlantic side from Venezuela 

 and the Guianas, through Brazil, Paraguay, and Uruguay to 

 Argentina. 



In the West Indies the beetles have been taken in Cuba, Puerto Rico, 

 Haiti, and Jamaica in the northern group of islands. Future col- 

 lectors will probably find them on other islands. This group is quite 

 distinct from any in North and South America. On each island is 

 found a species closely related to but slightly different from the ones 

 on the other islands. The specimens from the islands of Barbados, 

 Grenada, and Trinidad belong to a species that is also found in the 

 Guianas in South America. 



