230 long's second expedition. 



CRABRO Fabr. Latr. 



1. C. TIBIALIS. — Black, polished ; thoracic line, scutel, knees, 

 and tibiae, yellow ; abdomen with piceous incisures. 



Inhabits Pennsylvania. 



9 Head with a slightly impressed frontal line, extending to 

 the sternmata; antennae, basal joint yellow; hypostoma silvery, 

 brilliant ; thorax with a transverse, yellow line on the collar, not 

 extending to the postpectus ; scutel yellow ; wings hyaline ; ner- 

 vures fuscous, those of the disk pale at base ; metathorax slightly 

 carinated each side with a longitudinal, impressed line, which is 

 a little dilated beyond the middle, and a slight transverse line on 

 the middle; [341] pleura immaculate; tarsi slightly tinged 

 with testaceous ; 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. scutellatus. — Black, polished ; thoracic line, scutel, 

 knees, and tibiae, yellow; abdomen totally black. 



Inhabits Pennsylvania. 



Length ? one-fifth of an inch. 



This species closely resembles the preceding, but is smaller ; 

 the abdomen proportionally shorter, and entirely black ; the yel- 

 low line of the collar extends to a yellow spot at the commence- 

 ment of the pleura ; the transverse line 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. 6-maculatus. — Black ; terguin with three yellow spots 

 on each side. 



Inhabits Pennsylvania. 



J Antennae, basal joint yellow; mandibles at base yellow; 

 hypostoma silvery, brilliant ; thorax with a yellow band on the 

 collar, interrupted in the middle ; two parallel, abbreviated, trans- 

 verse, equal, yellow lines behind ; wings dusky ; pleura with two, 

 equal, rounded, yellow spots, one of which is beneath the supe- 

 rior wing and the other before it ; thighs black, knees yellowish ; 

 tibias yellow with a black or piceous spot on the inner side ; tarsi 



