HOWE: NEW ENGLAND ODONATA 
11( 
The line is marked by a well-wooded, morainal, boulder-strewn 
slope facing northwest toward Buzzard's Bay to an elevation of 
200 feet in an average distance inland of three miles. From the 
crest to southeast stretches the gentle slope of the sparingly wooded, 
sandy, outwash plain. The angle of insolation on these two slopes, 
plus the prevailing summer southwest wind, and forest shade, 
make the temperature on the latter slope decidedly higher. 
Whether this change in all its elements is sufficient to explain this 
separation barrier, or whether it is due to glacial advance and re- 
treat of the past it is, I suppose, impossible to say. Present topo- 
graphic control would seem to be far the more likely cause. Further 
collecting in the townships to the southeast of this line may prove 
that it is not as definite as it would now appear with the records at 
hand, but at all events the faunas of the base and lower Cape, are 
distinct in many species. 
To the east of this interlobate morainal boundary w^hicli really 
is, perhaps, the most natural one by which to set apart the Cape 
fauna, the following fifty-nine species have been taken of which 
nineteen are northern (indicated by italics) and forty southern. 
1. Agrion maculatum, one record 
— Chatham 
2. Hetaerina americana, one record 
— Provincetown 
3. Lestes congener 
4. disjunctus 
5. forcipatus 
6. roctangularis 
7. unguiculatus 
8. vigilax 
9. Argia mocsta 
10. violacea 
11. EnaHagma civile 
12. cijnaihigerum 
13. doublcdayi 
14. durum 
15. exsulans 
16. minusculum 
17. signatum 
18. Nehalennia irene 
19. Ischnura posita 
20. vorticalis 
21. Progomphus obscurus 
22. Gomphus abbreviatus, one record 
— Provincetown 
23. Gomphus exilis 
24. spicatus 
25. Dromogoraphus spinosus 
26. Boyeria vinosa 
27. Anax Junius 
28. Aeshna canadensis 
29. clepsydra 
30. tuborculifcra 
31. umbrosa 
32. verticalis 
33. Macromia illinoiensis 
34. Epicordulia princeps 
35. Tctragoncin-ia cynosura 
36. cynosura simulans 
37. Libellula auripennis 
38. cyanea 
39. cxiixfa, one record — Chatham 
40. iiu'csta 
41. pulclu>lla 
