THE CANADIAN ENTOMOLOGIST. 53 



coarsely rugose on the sides ; the longitudinal median depression broad 

 and shallow, densely and distinctly reticulate-punctate, except in the 

 longitudinal furrow, which is rugose and much wider in front than behind, 

 where there is frequently a single or rarely a double longitudinal carina. 

 In the smaller specimens the median furrow is entirely lacking. 



Antennae slightly clavate, dusky, except scape beneath, which is dull 

 brownish-yellow. The relative length of the segments is shown in fig. 8 ; 

 viewed at a different angle the club is a little broader. Coxa? black ; 

 femora black, tip yellowish-brown ; tibiae brownish, more or less infuscate 

 medially ; tarsi nearly white. On the cephalic face of front coxae there is 

 a deep diagonal furrow bounded in front by a distinct ridge. This ridge near 

 the upper outer angle makes a sharp turn and extends transversely around 

 on the side of the segment. Mesosternum has a distinct median pit in 

 front ; median carina lacking, except posteriorly, where it is represented 

 by a delicate ridge. Wings hyaline. (Figs. 9 and 10.) 



Abdomen smooth, without sculpture, subcompressed, seen from the 

 side broadly ovate, the tip sharp-pointed ; segments 2, 3, and 4 subequal, 

 the fifth longer than 3 and 4 together, the sixth very narrow and gently 

 emarginate in front of the spiracle of the seventh ; the seventh segment 

 clothed with fine white pile. (Fig. n.) 



Male: Length, 2 to 2.4 mm.; abdomen, .9 mm. These measure- 

 ments are only approximate on account of the contracted condition of the 

 abdomen in these specimens. 



Propodeum with the median longitudinal depression wide and 

 shallow, the furrow much less distinct than in female. The legs and wing- 

 veins are much darker than in female. Antennae black ; scape at base 

 and ring-joint brownish. Scape slightly enlarged beneath towards tip ; 

 pedicel subglobose ; the five funicle joints subequal, arched above, not 

 constricted at the middle, briefly pedicellate, and each with two whorls of 

 rather short hairs ; club as long as scape, two-jointed. (Fig. 12.) Petiole 

 slightly longer than the hind coxae, and finely but distinctly rugulose- 

 reticulate ; coxae with the same sculpture above. The body of abdomen 

 is highly arched above, squarely declivous in front ; the fourth segment is 

 longer than the fifth and sixth together. 



Described from numerous specimens reared during the summer of 

 1908 from seeds of Sumac, Rhus hirta, collected at Ithaca and Taughan- 

 nock Falls, N. Y. 



Schreimer (Zeitschr. wiss. Insbiol, IV, pp. 26-28, 1908) gives an 

 account of the phytophagous habits of another species of this genus, to 



