316 APPENDIX. 



the wings witli about three obsolete black spots before ; 

 feet white, thighs black in the middle, posterior tarsi black- 

 ish ; tergum black, the bands obsolete ; venter white, anal 

 segment blackish. 



Length three-tenths of an inch. 



Belongs to Nematus, Leach, and to Nematus ttt, Le 

 Peletier. 



TENTHREDO, Latr. 



1. T. basilaris. Black, hypostoma and basal joint of the 

 antennae yellow ; tergum bifasciate. 



Inhabits North-west Territory. 



9 Body polished ; hypostoma emarginate in a curved 

 line, and with the lahrum and mandibles yellow, the lat- 

 ter piceous at tip ; gena with a yellow line abbreviated 

 above ; tongue and palpi pale yellow ; thorax with a yel- 

 low line before the wings ; scutel yellow ; m,etathorax 

 with two small yellow spots ; wings tinged with ferrugi- 

 nous ; pleura with an oblique, dilated line above the in- 

 termediate feet, and a rhomboidal spot above the posterior 

 feet, yellow ; anterior feet greenish-white ; intermediate 

 feet pale yellowish, a black spot on the thighs near the tip 

 haYiindi; posterior feet pale yellowish, thighs and tibiae annu- 

 late with black at tip ; tergum, first segment white on the 

 posterior margin, fifth segment rufous, penultimate seg- 

 ment with a yellow subtriangular spot on each side, ulti- 

 mate segment at base, and tail, pale yellow j venter, fifth 

 segment rufous. 



Length of the body two-fifths of an inch. 



% Checks entirely yellow; a yellow spot on i\\e pleura 

 above the anterior feet, connected with the thoracic line ; 

 tergum yellowish-rufous, dusky at tip and black at base j 

 venter yellowish-white, dusky at tip. « 



