74 AMERICAN ENTOMOLOGY. 



Desc. Body ferruginous, punctured ; head with three indented 

 longitudinal lines on the vertex, and a transverse one between 

 the eyes ; antennas yellowish ; thorax scabrous before, disk with 

 a black spot on each side : wings brownish-fuliginous : carpus 

 yellowish : feet jiale yellowish : thighs ferruginous : tergum pale 

 yellowish-fulvous, sericeous : pectus, above the posterior feet, 

 black. 



Ohs. The specimen is a female. I obtained it in Missouri, 

 whilst engaged in the exploring expedition under the command 

 of Major Long. 



The upper figure. 



Tremex obsoletus. — Specific character. Ferruginous ; ter- 

 gum black. 



Tremex ohsoJctus nobis, Western Quarterly Reporter, vol. ii. 

 p. 73. 



Desc. Body ferruginous, punctured : head with three obsolete 

 indented lines upon the vertex, and a transverse one between the 

 eyes : antennas pale ferruginous : thorax scabrous before, with a 

 black spot on each side of the disk : wings yellowish brown, hya- 

 line ; carpus rufous ; posterior tibiae and tarsi, black at their 

 tips ; tergum black, polished ; segments, particularly those near 

 the base, with an obsoletely rufous spot on each side, more dis- 

 tinct on the fourth segment. 



Ohs. Taken in the same region with the preceding. The num- 

 ber of cubital cellules do not correspond with the definition 

 of the genus, as we have here adopted it. There are, in fact, 

 three cubital cellules, of which the first is veiy small, and it is 

 the second which receives the recurrent nervures. Notwith- 

 standing this character, however, there can be no doubt of these 

 insects being correctly arranged, when placed in this genus. 



The left figure. 



Tremex COLUMBA. — Specific character. Thorax ferruginous; 

 abdomen with a band, and lateral spots yellow. 



Sirex Columha Fabr., Syst. Piez. p. 49. Amoen. Acad. vol. 

 vi. p. 412. (Fabr.) 



Sirex Pennsyhanica Degeer, Ins. vol. iii. p. 393, pt. 1, pi. 30, 

 fig. 13, (Fabr.) 



Desc. Head ferruginous : vertex a little grooved, a blackish 

 line through the stemmata passes upon the posterior orbits : an- 



