1916] Houe — A Preliminary List of ihe Odonata of Concord, Mass. 15 



LIBELLULIDiE. 



CORDULINiE. 



35. Didymops transversa (Say) Hagen. Common, cfs. May. 



36. Tetragonenria cynosnra (Say) Selys. Recorded by Peirson. May. 



37. Williamsonia linteri Hagen = Corduiia linteri Hagen Recorded by Peirson. 



May. New to New England. 



LIBELLULIN^. 



38. Lihellida cyaneaYahTicms. Rather rare, of and $s. August. 



39. L. incesta Hagen. Abundant, cf and 9 s. July to September 10. 



40. Z. exusia Say. Rare. 9 . May to July. Recorded by Peirson. 



41. L. Ivctuosa Burm. Common. c?'and9s. July to August 15. New to New 



England. 



42. L. pvlchella Drury. Common, cf s. August 18 to September 8. ' 



43. Plathemis lydia (Drury) Hagen. Common, cf s. July to September 3. 



44. Sympetrum rnhiciindulum (Say) Kirby. Abundant, cf and 9 s. August 7 



to September 30. 



45. S. semicinctum (Say) Kirby. Rare, d^ and 9 s. August 25 to September 18. 



New to Middlesex County. 



46. S. vieinnm (Hagen) Kirby, Common, cf and 9 s. August 15 to November 



7. 



47. S. costifennn (Hagen) Kirby. Rare, c? and 9 s. September 5 to 18. New 



to Middlesex County. 



48. Celithemis elisa (Hagen) Walsh. Recorded from Concord in Dr. Calvert's 



New England list. 



49. C. eponina (Drurj') Hagen. Common, cf s. July to August. 



50. Perithemis domitia tenera (Say). Very common, cf and 9 s. July to August 



3. 



51. Erythemis simplicicollis (Say). Not uncommon, cf and 9 s. July to August 



23. 



52. Packydiplax longipemiis (Burm.) Brauer. One specimen, cf. August. 



SUMMARY. 



Number of species formerly known from New England 140 



Number added 4 



Number of species formerly known from Massachusetts 101 



Number added 9 



Number of species formerly known from Middlesex County 44 



Number added 20 



Number now known from Middlesex County 64 



Number here listed 52 



