Sept..i 9 o 5 .] Bueno : Notonecta of North America. 145 



no less than twelve are peculiar to America, the thirteenth being 

 European and Asiatic, also of these thirteen, eleven are to be found 

 north of Mexico, three being, so far as records show, strictly boreal. 

 It is not safe, however, to generalize regarding such variable and little- 

 known insects, since errors readily arise from this practice. The de- 

 scribed and recorded North American forms are Notonecta indica 

 Linne (= americana Fabricius*), N. undulata Say, N variabilis 

 Fieber, N. uhleri Kirkaldy, N. mexicana Amyot ec Serville, N 

 irrorata Uhler, N. lutea Muller, N. shooteri Uhler, N. imulata Kirby, 

 N. montezuma Kirkaldy, to which I add a new species, N. howardii. 



Notonecta indica Linne is peculiarly a subtropical form and is 

 found only in the warmer portions of the South and West, while N. 

 undulata Say is of the widest distribution, ranging to my knowledge, 

 from as far North as British Columbia and going down as far as Chile 

 in South America, according to Kirkaldy. The distribution of N 

 variabilis Fieber is not so well known, but it is commonly found in the 

 greater part of the United States. The very few recorded captures of 

 N. uhleri Kirkaldy make it very difficult to fix its limits, but it is cer- 

 tainly to be found all along the Atlantic and Gulf seaboards of the 

 United States. N. mexicana Amyot &: Serville is more peculiarly 

 tropical, but it comes in along our Southwestern boundary where the 

 climate is warmer, extending up along the Pacific Slope for some dis- 

 tance, which appears to be the case also with N. shooteri Uhler and N. 

 montezuma Kirkaldy, while on the other hand N. irrorata Uhler 

 seems to be northern and eastern, being found only in the colder sec- 

 tions. In N. insulafa Kirby we have a very peculiar distribution, the 

 bug being in the East apparently boreal, but in the West it goes down 

 into the warmer portions of the country. In N. lutea Muller we have 

 an addition to our fauna, of much interest since the insect has hereto- 

 fore been recorded only from Europe and Siberia. r 



Considering the United States only, I have been unable to find 

 any records of Notonecta from the following states : New Hampshire, 

 Vermont, Deleware, West Virginia, South Carolina, Georgia, Missis- 

 sippi, North Dakota, Alabama, Washington, Wyoming, and Arkansas, 

 and Indian and Oklahoma Territories. The insect must certainly 

 occur in them, since they are found in the neighboring ones. They 

 must, for instance, be found in New Hampshire and Vermont, since 



* Kirkaldy gives the Synonymy in " Uber Notonectiden." 



t Bueno, " A Palreartic Notonecta," Entomological News. XV, p. 220, June, 1904. 



