APPENDIX. . 343 



fore which is a smaller one, and wing-scale, yellow; wings 

 fuliginous; jo/ei<ra with a double yellow spot beneath the 

 anterior wing;yee/ honey-yellow, thighs black at base, ti- 

 biae bright yellow before ; tergum rough with large pro- 

 found punctures; first segment rounded, immaculate; se- 

 cond with a broad, yellow, slightly arcuated line, touching 

 the anterior edge and curving towards the posterior angles ; 

 third, fourth, and fifth segments, each with a narrow, dull 

 yellow band on the posterior margin ; venter immaculate. 



Length less than two-fifths of an inch. 



2. F.politus. Black, polished; tergum, first segment 

 with two whitish spots, the other segments with a spot 

 each side, connected by a whitish band. 



Inhabits Pennsylvania. 



Hypostoma, mandibles at base, and anterior orbits as 

 high as the emargination, whitish ; anteimss beneath be- 

 yond the third joint, rufous-brown, a whitish spot on the 

 basal joint ; thorax with small, irregular punctures ; collar 

 with two transverse spots ; wing-scale, and transverse line 

 on the scutel, whitish ; wings a little dusky towards the 

 tip ; pleura, a double whitish spot beneath the superior 

 wings ; thighs black ; knees and tibix excepting a black 

 line on the inner side, whitish ; tarsi dusky ; tergum po- 

 lished, first segment with a transverse ovate spot each 

 side ; remaining segments each with a transverse quadrate 

 spot each side, touching the posterior margin and connect- 

 ed along this margin by a band, which is transversely 

 thicker in the middle. 



Length more than seven-twentieths of an inch. 



CERCERIS, Latr. 



C. deserta. Black ; hypostoma, feet, and bands of the 

 tergum, yellow. 



