1 6 U II hers it y of Michigan 



Smaller species, length io-i2ji> mm.; body more slender, 

 length about three times width of pronotum ; scutellum 

 usually with a large black area, hemelytra usually with a 



black fascia at apex of corium N. iindulata 



4. Small slender species, length about 9 mm. ; color usually 



white, without dark markings N. z'ciriabiiis 



Large robust species, length 13 to 15 mm.; color of hemelytra 



bluish-black, irrorated with castaneous N. irrorata 



12. Kotonccta irrorata Uhler. This beautiful species seems 

 to have been fairly common in 1913, especially in the calm 

 slow-flowing waters of Bessey Creek, where a number of speci- 

 mens were secured ; but in each of the other years only four 

 individuals were taken. 



13. Kotonccta variabilis Fieber. Locally abundant, es- 

 pecially in the lower portion of Bessey Creek (Sta. VII), 

 where sixty-three of the sixty-seven specimens were secured. 

 This species was found only among the vegetation, and was 

 rarely seen at the surface of the water: by far the greater 

 number of the specimens were taken by dredging among the 

 Potamogeton and Ceratophyllum at the edges of the stream. 

 It was much more abundant during August than in July. 



14. Xotonccta horcalis Bueno and Hussey. This is the 

 species which ^Nlr. Bueno reported in 1904 from British Co- 

 lumbia as Xotonccta lutca ^liiller, but a study of the genitalia 

 shows it to be very distinct from that species. A description 

 of it as a new species by Mr. Bueno and the writer will appear 

 shortly. Mr. A'an Duzee, in his Catalogue of the Hemiptera 

 of America Xorth of ^Mexico reports it also from ^lanitoba, 

 and I have seen one specimen from Maine in Prof Parshley's 

 collection. This is the first published record for the United 

 States. 



In the Dotiglas Lake region, though rather restricted in its 

 local distribution, it ranks next to -V. nndulata in abundance, 

 and at Bryant's Bog (Sta. IX), far outnumbers that species. 

 It is particularly abundant in the peat bogs, though found also 



