NO. 2192. DRAG0NFLIE8, CALIFORNIA AND NEVADA— KENNEDY. 507 



of these the spiculation weakens gradually caudad, while m this denti- 

 collis nymph it is strong and ends abruptly at the apical end of the 

 straight basal section of the inferior edge. 



7. A NEW GENUS BASED ON TACHOPTERYX HAGENI. 



While labehng the dragonflies in the collection of the California 

 Academy of Science it was my good fortune to find a pair of the 

 very rare Tachopteryx Jiageni Selys. With the permission of the 

 director, Dr. Barton W. Evermann, I had the privilege of bringing 

 these specimens to Stanford, where I was able to make a careful 

 study of them. 



Tachopteryx Selys is, perhaps, the most primitive genus of living 

 aiiisopterous dragonfUes in North America. Only three species are 

 known: Tachopteryx pryeri Selys from Japan, Tachopteryx thoreyi 

 (Hagen) from the Alleghanies of eastern North America, and Tachop- 

 teryx hageni Selys, which was described in 1879 from a single male 

 specimen collected in "Nevada" and now in the Selys collection in 

 Brussels. 



In September I had the privilege of working in Mi\ Williamson's 

 collection at Bluffton, where studies of thoreyi were made. Through 

 the kindness of Mi-. Williamson and Doctor Ris I was enabled to get 

 into touch with MM. Severin and Meuninger, who have foi-warded 

 photos and drawings of pryeri. At about the time of the arrival of 

 these figures my attention was called by Doctor Calvert to three 

 very fine specimens of pryeri in his collection in the Philadelphia 

 Academy of Science. These I had the privilege of studying while 

 working in this collection recently. Further, Mr. Williamson has 

 loaned me the original of his published drawing of the nymph of 

 thoreyi. 



From my study and comparison of this data I beUeve that the 

 two species hageni and pryeri should be placed in a genus distinct 

 from Tachopteryx thoreyi, as the latter shows structural characters 

 and a higher development of the venation wliich separate it from 

 hageni and pryeri. 



TANYPTERYX, new genus. 



Of the Petalurinae. Eyes widely separated, labium with median 

 lobe cleft. Whip of antenna jointed. The internal triangle of the 

 front wings three celled, its sides subequal. Superior appendages 

 of the male only moderately dilated. A large hairy tubercle on the 

 ventral side of the metathorax. Color largely black. 



Wings with normally a more reduced venation than in Tachop- 

 teryx thoreyi. The third, fourth, or rarely fifth antenodal developed 

 as a brace vein. The anal loop with two to four cells. (This varies 

 in some wings, for the female hageni in Philadelphia has five in one 



