LONGS SECOND EXPEDITION. 211 



This species seems to be allied to L. americanus Leach, but 

 that insect is stated to have nineteen joints to the antennae. 



NEMATUS Jur. 



N. ventralis. — Black ; venter and feet pale. 



Inhabits United States. 



% Hypostoma, palpi and mandibles at base, whitish ; orbits 

 above and behind piceous; thorax dilated, triangular line before 

 the wing, and wing scale whitish ; wings slightly dusky, ner- 

 vures fuscous; feet honey-yellow, posterior tarsi black-brown; 

 tergum black, segments each with a yellow band of which the 

 four terminal ones are interrupted in the middle; venter pale 

 honey -yellow. 



Length one-fourth of an inch. 



9 Orbits all round whitish ; white line or spot before [316] 

 the wings with about three obsolete black spots before ; feet white, 

 thighs black in the middle, posterior tarsi blackish; tergum 

 lack, the bands obsolete ; venter white and segments blackish. 



Length three-tenths of an inch. 



Belongs to Nematus Leach, and to Nematiis f ff Le Felletier. 



TENTHREDO Latr. 



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

 antennae yellow; tergum bifasciate. 



Inhabits North-west Territory. 



<j> Body polished ; hypostoma emarginate in a curved line, and 

 with the labrum and mandibles yellow, the latter piceous at tip ; 

 gena with a yellow line abbreviated above ; tongue and palpi 

 pale yellow; thorax with a yellow line before the wings; scutel 

 yellow; metathorax with two small yellow spots ; wings kinged 

 with ferruginous ; pleura with an oblique, dilated line above the 

 intermediate feet, and a rhomboidal spot above the posteri* 

 yellow; anterior feet greenish-white; intermediate feet pal 

 lowish, a black spot on the thighs near the tip behind ; posterior 

 feet pale yellowish, thighs and tibiae annulate with black at tip ; 

 tergum, first segment white on the posterior margin, fifth seg- 

 ment rufous, penultimate segment with a yellow subtriangular 

 spot on each side, ultimate segment at base, and tail, pale 

 venter, fifth segment, rufous. 



Length of the body two-fifths of an inch. 



