APPENDIX. 341 



die ; "pleura immaculate ; tarsi slightly tinged with testa- 

 ceous ; posterior pair entirely black ; abdomen rather long, 

 blackish-piceous ; incisures edged behind with pale-piceous, 

 the second segment above margined behind with pale- 

 piceous. 



Length three-tenths of an inch. 



A small species in the collection of Mr. William W. 

 Wood. 



2. C. scutellatiis. Black, polished ; thoracic line, scutel, 

 knees, and tibise, yellow ; abdomen totally black. 



Inhabits Pennsylvania. 



Length 9 one-fifth of an inch. 



This species closely resembles the preceding, but is 

 smaller ; the abdomen proportionally shorter, and entirely 

 black ; the yellow line of the collar extends to a yellow 

 spot at the commencement of the pleura ; the transverse 

 hne of the metathorax is much more profoundly indented, 

 and a transverse punctured line is far more obvious than 

 in the preceding ; the intermediate and posterior tibiae have 

 a black spot near the tip. 



3. C. Q-maculatus. Black; tergum with three yellow 

 spots on each side. 



Inhabits Pennsylvania. 



$ Jintennse, basal joint yellow ; mandibles at base yel- 

 low ; hypostoma silvery, brilliant ; thorax with a yellow 

 band on the collar, interrupted in the middle ; two parallel^ 

 abbreviated, transverse, equal, yellow lines behind ; wings 

 dusky ; pleura with two, equal, rounded, yellow spots, one 

 of which is beneath the superior wing and the other be* 

 fore it ; thighs black, knees yellowish ; tibise yellow with 

 a black or piceous spot on the inner side ; tarsi tinged 

 with rufous ; tergum on the second, fourth and fifth seg- 

 ments with a transversely oval spot. 



Vox. II. 44 



