140 Psyche [December 



where conditions seemed favorable for collecting, and thus I was 

 enabled to gather the material reported on below. Among the 

 records presented, all of which contribute to widen our knowledge 

 of the distribution of Hemiptera in New England, a few are of 

 especial significance. 



The known range of Rheumaiobates rileyi is extended consider- 

 ably to the northward, showing that this species is by no means 

 austral in habitat, as for a long time seemed probable. Hussey^ 

 has lately reported it as occurring in northern Michigan, and I 

 have found it recently in Massachusetts- and now in southern Ver- 

 mont. Another interesting case is that of Nahis limbatus, occur- 

 ring in numbers on the summit of Mt. Grey lock, where it was found 

 also by Professor A. P. Morse in 1894. The known distribution of 

 this species provides us with a striking instance not only of boreal 

 habitat (in North America) but also of holarctic range. In the 

 Old World it extends from Britain far into Siberia and southward 

 to the warm climate of Algeria, but in North America it is met with 

 only in the north or on mountains, in situations where its presence 

 is clearly due not to recent introduction but to ancient migration. 

 Still, we must emphasize the fact that the geographical distribu- 

 tion of but few species of Hemiptera is known in sufficient detail to 

 warrant valid generalization, and thus a fruitful field of research is 

 offered, especially to the careful collector. Nothing will contribute 

 more effectually to this important branch of science than the pub- 

 lication of local lists, if the chief defect in past work of this char- 

 acter, inaccuracy of identification, is adequately guarded against. 



Mt. Greylock,^ Massachusetts, September ^, 1919. 

 Cydnidse. 

 Thyreocoris ater (Amyot et Serville). 

 Sehirus cinctus (Palisot de Beauvois) . 



Pentatomidse. 

 Podisus maculiventris (Say). 



Alydidse. 

 Alydus pitosulus (Herrich-Schaeffer) . 



1 Waterbugs of Douglas Lake Region, Occas. Papers Mus. Zool., Univ. of Michigan, No. 75t 



1919, p. 12. 



2 Ethological Remarks on New England Water-striders, Bull. Brooklyn Ent. Soc, Vol. 15, 



1920, p. 69. 



' From the boreal summit, 3,500 feet, unless otherwise stated. 



