May, 1907.] A Collecting Trip North of Sault Ste. Marie. i47 



some of the Libellulines such as Libellula incesta and Plathemis 

 Ivdia. Another species of Somatochlora was taken along Achigan 

 Brook, but unfortunately it was broken into fragments by the 

 ring of the insect net, rendering identification at the time impos- ' 

 sibie, and the fragments were subsequently lost. 



Somatochlora williamsoni Walker. Oden, Michigan, Aug. 

 11th. Two males; I have in my cohection a male of this 

 species collected by M. K. Williamson at Oden, on Aug. 14, 1904. 



24. Cordulia shurtleflEi Scudder. Stony Lake, Aug. 3d. A 

 single teneral male taken. 



25. Dorocordulia libera Selys. Stony Lake, Aug. 3d, a 

 single male which frequented a small area of water, floating logs 

 and fallen tree tops. 



26. Leucorhinia frigida Hagen. Stony Lake, Aug. 3d and 

 4th. Two males and two females. Associated with the next two 

 species at Stony Lake. The three species were frequently found 

 resting on all possible supports a short distance from the water 

 and over the water a short distance from the shore, about the 

 pond-like lower end of the lake. Frigida seemed to prefer, how- 

 ever, the dsad twigs of fallen tree tops lying in the water some 

 distance from the shore. 



27. Leucorhinia proxina Calvert. Heyden. July 31st and 

 Aug. 3d and 4th, Searchmont, Aug. 6th. Twenty males and 

 fifteen females. All of these excepting three females, two taken 

 July 31st and one Aug. 6th, were taken at Stony Lake. One of 

 these males I at first thought represented another species, 

 because of the following characters: the basal branch of the 

 hamule is bent down on the hamule ; the triangle of the front 

 wing is followed bv three cells, then three, then increasing; and 

 the labium is varied with pale areas. The specimen was referred 

 to Dr. Calvert who called my attention to Hagen's notes on the 

 folding of the basal branch of the hamule (Syn. Od. Genus 

 Leucorhinia, pp. 229-236, Trans. Am. Ent. Soc. XVII, Jtily, 

 1S90). Also a tabulation of venational characters of specimens 

 in Dr. Calvert's collection shows that proxima has the triangle of 

 the front wing followed by three rows of cells, increasing, or by 

 three rows, then two, then increasing. Moreover, there is con- 

 siderable variation in the color of the labium in this species. 



28. Leucorhinia glacialis Hagen. Stony Lake, Aug. 3d and 

 4th. Five males. One male has the lower basal cell 'in both 

 hind wings twice crossed. 



29. Leucorhinia intacta Hagen. Sault Ste. Marie, Ontario, 

 Julv 29th. One female. 



30. Sympetrum obtrusum Hagen. Sault Ste. Marie, Ontario, 

 July 29th and 30th. Heyden, July 30th and 31st and Aug. 3d. 

 Searchmont, Aug. 1. () and Sth. Oden, Mich. Aug. 11th and 12th, 

 and Aug. 14th and 26th (J. H Williamson). Forty males and six 



