long's second expedition 215 



dividing nervure of the cubital and discoidal cellules to.the pos- 

 terior margin of the wing; abdomen much compressed, impunc- 

 turcd, polished, oval, rather longer than the petiole; posterior 

 feet elongated. 



Length more than three-tenths of an inch. 



The proportions of the petiole, abdomen, and posterior feet of 

 this insect are nearly the same with those of appendigaster Fabr. 

 I obtained a specimen near the Rocky Mountains, and it is also 

 found in Pennsylvania. The additional nervine is sometimes 

 connected with the radial cellule by a faint, transverse nervure 

 so as to form a second cubital cellule. 



FOENUS Fabr. [321] 



F. TARSATORius. — Black; feet pale rufous; posterior tibia 

 blackish, at base white. 

 Inhabits Pennsylvania. 



Antennae black-testaceous beneath towards the tip ; mandibles 

 testaceous, at tip black; hypostoma each side silvery; stethidium 

 immaculate, confluently punctured; wings hyaline, nervures fus- 

 cous; anterior and intermediate feet pale rufous, the tibiae with a 

 whitish line, the base of the tarsi white; posterior feet piceous, 

 tibiae blackish, clavate, a white band near the base, which is much 

 dilated before ; tarsi white at base, the first joint with a black 

 origin; abdomen blackish, with about three dull testaceous spots 

 on each side ; oviduct pale testaceous ; valves blackish, at tip 

 whitish. 



Length of the body eleven-twentieths of an inch. 

 SIGALPHUS Latr. 



1. S. sericeus. — ? Black ; tergum sericeous ; tibia ochreous at 

 base. 



Inhabits North-west Territory. 



Head with dilated, transversely confluent punctures ; uasus 

 minutely punctured ; thorax with much dilated, irregularly C< 

 fluent punctures ; scutel polished, almost impunctured on the disk, 

 lateral margin grooved; wings slightly fuliginous, nervures fus- 

 cous, those of the base very pale brownish ; metathorax with ver\ 

 large, somewhat discoidal punctures ; tergum vrithoul oh\ ious in- 

 cisures, black, covered with short, dense, cinereous, sericeous hair ; 

 obtuseattip; venter excavated ; anterior pairs oi feel black, [322] 



