THK CANADIAN ENTOMOLOGIST. 223 



Pezotettix gracilis, Briiner. (C. E., XXIII., 8i.) 



Mature specimens have been taken as early as June 25th. By July 

 4th it is common, especially upon the iron weeds ( Vernonia fascictilata, 

 Mich.) which grow abundantly in low, open woods. It has been found in 

 copulation at this date and as late as November loth, though whether 

 there is more than one brood each season, I have not been able to ascer- 

 tain. 



(To be continued.) 



A LEAF-TISSUE GALL ON MOUNTAIN COTTONWOOD. 



BY C. H. TYLER TOWNSEND, KINGSTON, JAMAICA. 



A fleshy leaf- tissue gall was found on terminal twigs of Populus 

 Monilifera(l) June 18, 1892, a few miles to the north of Ojo Caliente, in 

 Southern Socorro county, New Mexico. This gall is somewhat similar in 

 method of formation to one that has been found on Rhus microphylla, 

 which possesses a cock's-comb-like appearance. 



Qall. — Diameter (after being thoroughly dried and much shrunken) 

 of four galls : 15 by 12 mm. ; 17 by 19 by 14 mm. ; 20 by 14 mpi. ; 22 

 by 20 by 18 mm. ; the length (extent on stem) being less than width. 

 Gall rather irregular in outline, fleshy, growing more or less in irregular 

 sections, clustered together around the twig, but springing from side 

 stems, consisting of a mass of fleshy, abnormally developed and degraded 

 leaf-tissue massed together. Colour, red on all surface exposed to the 

 sun ; the lower or inner surface next the centre of the tree, when not 

 so exposed, but sheltered by the foliage, greenish. The irregularity of 

 the external surface of the gall is due to the various groups of massed 

 leaf-tissue being independently and unequally developed, with spaces 

 between. 



Four galls. Two cast skins were found on the surface of these. The 

 skins appear to be hemipterous, possibly homopterous. The fleshy 

 sections of tissue contain cavities within, but there is no trace of the gall 

 maker. 



