THE CANADIAN ENTOMOLOGIST 365 



whitish. The prothorax, except the parts named, the cephalic 

 part of the mesopleurse, and the pectus, rufous; the posterior 

 femora more or less shaded with fuscous; the head smooth with 

 antennal furrows interrupted on the middle of the face; the furrows 

 surrounding the postocellar area deep and distinct; the vertical 

 furrows not reaching the occiput; the median ocellus placed on a 

 flat depression; a pit above the antennal socket; the median fovea 

 minute but distinct; the clypeus truncate; the first and second 

 antennal segments subequal, the third segment subequal to one 

 and two together and longer than four; the saw-guides with the 

 dorsal and ventral margins converging and the apex bluntly 

 pointed; the male differs in having the rufous part of the thorax 

 inclined to whitish and extending over the entire pleurae, the venter 

 of the abdomen and a broad band on the lateral part of the dorsal 

 aspect, broader behind, sometimes fused on the meson, whitish; 

 the posterior femora not fuscous. Length 3 to 4 mm. 



Habitat — Massachusetts and New York. 



This insect was first received May 10th, 1909, from Mr. Ralph 

 W. Curtis, Assistant Superintendent of Parks of Boston, Mass., 

 who reported the larvae as mining the leaves of Cratcegus. Larvae 

 and adults were collected during the summer of 1911 by Mr. 

 Andrew Rutherford in the Cascadilla ravine, Ithaca, N. Y., on 

 Cratcsgus. It was also received during 1911 from Mr. P. J. Parrott, 

 who reported it from Geneva, N. Y., where the larva* were serious 

 pests, mining the leaves of cherry. 



Fenusa. — It has been shown by Mr. S. A. Rohwer that the 

 type of this genus is Tenthredo (Emphytus) pumila Klg., which is 

 congeneric with Kaliosysphinga dohrnii Tischbein, the type of 

 Kaliosysphinga. Fenusa will therefore replace Kaliosysphiga, and 

 another name must be used for the group of species hitherto in- 

 cluded under Fenusa. 



Messa. — It has also been shown by Mr. S. A. Rohwer that the 

 type of the genus Messa Leach, a name hitherto erronously associ- 

 ated with certain species of Nematina?, is Tenthredo (Emphyius) 

 hart ulana Klg., which is one of the species formerly associated with 

 the generic name Fenusa. This name should, therefore, be used 

 for those species and includes the American Fenusa ambigua Nort. 



