1913] Taxo7iomic Characters in Tetrajiychus. 455 



NOTES ON OLD SPECIES AND DESCRIPTIONS OF NEW ONES. 



In these notes three new species are for the first time here 

 delineated. Before long the writer hopes to publish complete 

 descriptions of these together with illustrations of those struc- 

 tures having special systematic importance. 



Tetranychus telarius Linn. 



Acarus telarius Linn. — Fn. Suec, 481, No. 1974 (1761). 



This species appears to have the following American 



synonyms : 



Tetranychus sexmaculatus Riley (?) — Insect Life, Vol. II., p. 225. (1890). 

 Tetranychus 2-maculatus Harvey — Ann. Rep't. Maine Agri. Exp. Sta., part IV., 



p. 133, PI. III. (1892). 

 Tetranychus gloveri Banks — The Red Spider of the United States. Tech. Ser. 



No. 8, Div. Entom., U. S. Dep't. Agri., p. 76. (1900). 



This is our most common and most widely distributed species 

 of red spider. It is also the most common species found in 

 Europe. I give the following description of the penis of the 

 male: 



Penis short, stout. Inner lobe long, rod-like; longer than tlie 

 shaft, and somewhat bent. Shaft thick, stout, short, much stouter at 

 its base than at its distal end where it bears the prominent hook. 

 Basilar lobe present, on the upper side of the shaft; it is small, protrudes 

 slightly, and is hook-like in shape. Hook short, stout, extending 

 dorsally; three or four times as broad at its base as it is at its apex; it 

 forms an angle of over 90° with the apex of the shaft. Barb present 

 at the end of the hook, flattened and recurved. 



That our well known T. 2-maculatus Harvey is synonymous 

 with T. telarius Linn, there can be but little doubt. I have 

 sent specimens to Professor A. Berlese, of Italy, and after com- 

 paring them with the European species, he writes that they are 

 the same. I have sent specimens to Dr. A. C. Oudermans, of 

 Netherlands, and he states that they equal T. telarius L. I 

 have received named female specimens of European individuals 

 of T. telarius Linn, from Dr. Oudermans, which were collected 

 from English elm {Ulmus campestris L.) at Amsterdam, October 

 1910. I have compared these females with the females of our 

 T. bimaculatus Linn. I find in these specimens the presence of 

 the same six bristles near the base of the tarsal pedicel of leg I. 

 The four tenent hairs are similarly arranged and shaped in every 

 respect as they are in our species. The tarsal pedicel is similar 

 to our species. The tarsal claw is six cleft, and exactly like 

 those I have examined in America. 



