Uhler.] 442 [April 17, 



Nos. 66, 109, Harris' Collection. "Belostoma americana Fab., Be- 

 lostoma grisea Say MSS., determined by himself." " Pond at Sweet 

 Auburn, Cambridge, Oct. 20, 1831. No. 109, Belostoma sordida Har- 

 ris' Catalogue. Cambridge, September and October. Maine, Mr. 

 Randall, 1836." 



The name B. americana does not occur in the published writings 

 of Fabricius; and if not merely one of his manuscript designations, 

 it may have originated with some of the older entomologists in the 

 United States. 



It is also so closely allied to B. annulata, H.-Schf., belonging to 

 South America, that the comparison of a series of specimens from 

 the two localities may prove them to be the same species. The spec- 

 imens in this collection consist of a very large individual, measuring 

 50 millims in length, and of a very small one, measuring 43 millims. 



NOTONECTHm 



Notonecta Linn. 



1. N. insulata. 



Notonecta insulata Kirby, Fauna Bor. Amer., 285, No. 399. Noto- 

 necta rugosa Fieber, Ehyng., 52, No. 7. Var. plagiata, et var. cor- 

 digera. 



No. 17, Harris' Collection. " July 1, 1823." 



Two varieties of this species are present. Those above cited in 

 Fieber's Monograph seem to be of rare occurrence in New York, 

 where the species is quite common. Thus far I have failed to obtain 

 specimens of these varieties in Maryland, although Dr. Fieber indi- 

 cates Baltimore as the locality for them. Determined as N. novebo- 

 racensis Forster (maculata Oliv.) var. by Mr. Say. Another specimen 

 in the collection has a printed number 402, attached to the pin. 



2. N. undulata. 



Notonecta undulata Say, Hemipt. New Harm., 39, 1. Notonecta va- 

 riabilis Fieber, 1. c. 53, No. 8. Var. maculata. 



No. 17, j3, Harris' Collection. "Rivers and ponds. Sept. 20, 

 1821. ; May 15, 1828, d", ?." Determined by Mr. Say. 



Four varieties remain in the collection, noted /?. y. <5. e. The va- 

 riety y differs only a very little from the tye of maculata Fieber; but 

 besides this, the species offers almost every possible variation between 

 that with the broad black band and streaks, to that without a vestige 

 of dark marking. It varies also in size, ranging from 9 to 12^ mil- 



