82 ENTOMOLOGICAL NEWS [xxxii, '21 



questionably placed in the synonymy of 5". cosiiferum by 

 Dr. Ris, and is catalogued by Dr. Muttkowski (Bull. Publ. 

 Mus. Milwaukee 160, 1910) as "Canadian; Yellowstone." 



The most perfect specimen measures length 34 mm., alar 

 expansion 55 mm., pterostigma 2.5 mm. One specimen lacks 

 the head, the other the six distal segments of the abdomen. 

 The genitalia and abdominal appendages are here figured. Mr. 

 Wheeler has generously given the author one of the specimens, 

 the other remains in his own collection. 



This capture adds a new species to the New England fauna 

 which now numbers 159, as C or dulcg aster erroneus Hagen and 

 Sympctrum corruption (Hagen) have also been added since 

 the publication of the author's Manual. 



Since writing the above I have found a reference by Dr. 

 Muttkowski (Bull. Wis. Nat. Hist. Soc. 6:167, 1908) to a 

 teneral "Sympctnnn sp." taken at Fox Lake, Dodge County, 

 Wisconsin, which' he states suggests 5. costifcrum "save that 

 the tarsi are entirely black." He figures the abdominal appen- 

 dages and genitalia which resemble closely the figures here 

 given. In fact the genitalia as figured in Dr. Needham's 

 Aquatic Insects (520) of S. semi cine turn resemble much more 

 closely these than they do those given for S. costifcrum, and 

 as they do actual material examined. In a later paper (ibid. 

 8:58, 1910) Dr. Muttkowski refers to another similar speci- 

 men (teneral) taken Aug. 13-14, 1909 at North Hudson, St. 

 Croix County, Wisconsin, which also has "entirely black tarsi." 

 Except for his remark that the "costal area of all wings is 

 flavescent" it would appear that his specimens were .S". atripcs, 

 and in all teneral specimens before me of 5\ costifcrum the 

 flavescence is more marked than in the adults.* 



[*In my collection, at The Academy of Natural Sciences of Phila- 

 delphia, are a male and a female of 5". atripcs, labeled "Yellowstone, 

 Aug. 30, 1894, C. C. Adams" and "Compared with H's type hy P. P. C." 

 The male has the denticles on the inferior surface of the superior 

 appendages, four in number, nearer together than in Dr. Howe's figure 

 and occupying only the terminal fourth of the inferior margin as seen 

 in profile view (excluding the upward slope to the apex), sides of 

 abdominal segment 2 not hairy, a very slight flavescence along the 

 anterior margin of both front and hind wings. Philip P. Calvert.] 



